* Re: [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache
2014-12-22 17:47 [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache Masami Hiramatsu
@ 2014-12-22 16:45 ` Steven Rostedt
2014-12-24 1:13 ` Masami Hiramatsu
2014-12-22 17:47 ` [PATCH trace-cmd V5 1/6] trace-cmd: Support -N option for trace-cmd extract Masami Hiramatsu
` (6 subsequent siblings)
7 siblings, 1 reply; 14+ messages in thread
From: Steven Rostedt @ 2014-12-22 16:45 UTC (permalink / raw)
To: Masami Hiramatsu
Cc: Hidehiro Kawai, yrl.pp-manager.tt, Aaron Fabbri, linux-kernel,
Divya Vyas
On Mon, 22 Dec 2014 12:47:36 -0500
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:
> Hi,
>
> This is the version 5 series of virtio-trace for trace-cmd.
> The previous series is here; https://lkml.org/lkml/2014/7/10/747
Thanks, I'll take a look at this.
I don't think you wanted the cover subject. Also, the date on this
email is still over an hour in the future from this reply.
-- Steve
>
> I took over this work from Yoshihiro Yunomae. This version includes
> some fixes.
> - Add -N support for extract subcommand(1/6).
> - As Steven suggested, this send "-1V2\0<MAGIC>\0" instead
> of "V2\0<MAGIC>\0" at first.
> - Add a document of Protocol change in Documentation/Protocol.txt.
> (Now all the protocol descriptions are moved into that)
> - Cleanup the code and document a bit.
>
> How to use
> ==========
> 1. Run virt-server on a host
> # trace-cmd virt-server --dom guest1 -c 2
>
> 2. Set up of virtio-serial pipe of guest1 on the host
> Add the following tags to domain XML files.
> # virsh edit guest1
> <channel type='unix'>
> <source mode='connect' path='/tmp/trace-cmd/virt/agent-ctl-path'/>
> <target type='virtio' name='agent-ctl-path'/>
> </channel>
> <channel type='pipe'>
> <source path='/tmp/trace-cmd/virt/guest1/trace-path-cpu0'/>
> <target type='virtio' name='trace-path-cpu0'/>
> </channel>
> <channel type='pipe'>
> <source path='/tmp/trace-cmd/virt/guest1/trace-path-cpu1'/>
> <target type='virtio' name='trace-path-cpu1'/>
> </channel>
>
> 3. Boot the guest
> # virsh start guest1
>
> 4. Run the guest1's client(see trace-cmd-record(1) with the *--virt* option)
> # trace-cmd record -e sched* --virt
>
> If you want to boot another guest sends trace-data via virtio-serial,
> you will manually make the guest domain directory and trace data I/Fs.
>
> - Make guest domain directory on the host
> # mkdir -p /tmp/trace-cmd/virt/<DOMAIN>
> # chmod 710 /tmp/trace-cmd/virt/<DOMAIN>
> # chgrp qemu /tmp/trace-cmd/virt/<DOMAIN>
>
> - Make FIFO on the host
> # mkfifo /tmp/trace-cmd/virt/<DOMAIN>/trace-path-cpu{0,1,...,X}.{in,out}
>
> TODO
> ====
> - Don't use fixed directory and fifos. Make it flexible.
> - Don't depend on the libvirt. We can find fifos in /proc/<pid>/fd/*.
> - Cleanup the code. It is not well structured now.
>
> Thank you,
>
> ---
>
> Masami Hiramatsu (6):
> trace-cmd: Support -N option for trace-cmd extract
> trace-cmd/listen: Introduce trace-msg protocol (protocol v2)
> trace-cmd/msg: Use poll(2) to wait for a message
> trace-cmd/virt-server: Add virt-server mode for a virtualization environment
> trace-cmd/record: Add --virt option for record mode
> trace-cmd/virt-server: Add --dom option which makes a domain directory to virt-server
>
>
> Documentation/Protocol.txt | 163 +++++
> Documentation/trace-cmd-record.1.txt | 11
> Documentation/trace-cmd-virt-server.1.txt | 113 ++++
> Makefile | 2
> trace-cmd.c | 3
> trace-cmd.h | 15 +
> trace-listen.c | 666 +++++++++++++++++++---
> trace-msg.c | 870 +++++++++++++++++++++++++++++
> trace-msg.h | 31 +
> trace-output.c | 4
> trace-record.c | 160 +++++
> trace-recorder.c | 50 +-
> trace-usage.c | 18 +
> 13 files changed, 1966 insertions(+), 140 deletions(-)
> create mode 100644 Documentation/Protocol.txt
> create mode 100644 Documentation/trace-cmd-virt-server.1.txt
> create mode 100644 trace-msg.c
> create mode 100644 trace-msg.h
>
> --
> Masami HIRAMATSU
> Software Platform Research Dpt. Linux Technology Center
> Hitachi, Ltd., Yokohama Research Laboratory
> E-mail: masami.hiramatsu.pt@hitachi.com
^ permalink raw reply [flat|nested] 14+ messages in thread* Re: Re: [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache
2014-12-22 16:45 ` Steven Rostedt
@ 2014-12-24 1:13 ` Masami Hiramatsu
0 siblings, 0 replies; 14+ messages in thread
From: Masami Hiramatsu @ 2014-12-24 1:13 UTC (permalink / raw)
To: Steven Rostedt
Cc: Hidehiro Kawai, yrl.pp-manager.tt, Aaron Fabbri, linux-kernel,
Divya Vyas
(2014/12/23 1:45), Steven Rostedt wrote:
> On Mon, 22 Dec 2014 12:47:36 -0500
> Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:
>
>> Hi,
>>
>> This is the version 5 series of virtio-trace for trace-cmd.
>> The previous series is here; https://lkml.org/lkml/2014/7/10/747
>
> Thanks, I'll take a look at this.
>
> I don't think you wanted the cover subject. Also, the date on this
> email is still over an hour in the future from this reply.
Oops, sorry forgot to update it... :(
I missed to set up time-related things on my development machine,
it was fixed now.
Thanks,
--
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@hitachi.com
^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH trace-cmd V5 1/6] trace-cmd: Support -N option for trace-cmd extract
2014-12-22 17:47 [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache Masami Hiramatsu
2014-12-22 16:45 ` Steven Rostedt
@ 2014-12-22 17:47 ` Masami Hiramatsu
2014-12-22 17:47 ` [PATCH trace-cmd V5 2/6] trace-cmd/listen: Introduce trace-msg protocol (protocol v2) Masami Hiramatsu
` (5 subsequent siblings)
7 siblings, 0 replies; 14+ messages in thread
From: Masami Hiramatsu @ 2014-12-22 17:47 UTC (permalink / raw)
To: Steven Rostedt
Cc: Hidehiro Kawai, yrl.pp-manager.tt, Aaron Fabbri, linux-kernel,
Divya Vyas
There is no reason to prohibit supporting -N command in extract
mode, since both record and extract read trace logs from ftrace
and save it.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
trace-record.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/trace-record.c b/trace-record.c
index 3e5def2..a3a07e1 100644
--- a/trace-record.c
+++ b/trace-record.c
@@ -390,6 +390,7 @@ static void stop_threads(void)
}
}
+static void setup_network(void);
static int create_recorder(struct buffer_instance *instance, int cpu, int extract);
static void flush_threads(void)
@@ -400,6 +401,9 @@ static void flush_threads(void)
if (!cpu_count)
return;
+ if (host)
+ setup_network();
+
for (i = 0; i < cpu_count; i++) {
/* Extract doesn't support sub buffers yet */
ret = create_recorder(&top_instance, i, 1);
@@ -2987,8 +2991,8 @@ void trace_record (int argc, char **argv)
rt_prio = atoi(optarg);
break;
case 'N':
- if (!record)
- die("-N only available with record");
+ if (!record && !extract)
+ die("-N only available with record or extract");
if (output)
die("-N incompatible with -o");
host = optarg;
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH trace-cmd V5 2/6] trace-cmd/listen: Introduce trace-msg protocol (protocol v2)
2014-12-22 17:47 [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache Masami Hiramatsu
2014-12-22 16:45 ` Steven Rostedt
2014-12-22 17:47 ` [PATCH trace-cmd V5 1/6] trace-cmd: Support -N option for trace-cmd extract Masami Hiramatsu
@ 2014-12-22 17:47 ` Masami Hiramatsu
2015-05-20 3:12 ` Steven Rostedt
2014-12-22 17:47 ` [PATCH trace-cmd V5 3/6] trace-cmd/msg: Use poll(2) to wait for a message Masami Hiramatsu
` (4 subsequent siblings)
7 siblings, 1 reply; 14+ messages in thread
From: Masami Hiramatsu @ 2014-12-22 17:47 UTC (permalink / raw)
To: Steven Rostedt
Cc: Hidehiro Kawai, yrl.pp-manager.tt, Aaron Fabbri, linux-kernel,
Divya Vyas
Introduce new trace-msg protocol (protocol V2) for more
flexible messaging. V1 protocol which is currently used
by trace-cmd server and client, is based on a simple
text messages. It is impossible to extend the protocol
without breaking backward compatibility. The V2 protocol
introduced by this patch is a binary message-based protocol
and it is able to extend by just adding message tags.
<How to test>
[1] Backward compatibility checks
We need to test backward compatibility of this patch for old
trace-cmds(client/server). So, this patch was tested for [2]
command checks in following 3 types:
<client> <server>
new old
old new
new new
[2] Command checks
- server (common)
# trace-cmd listen -p 12345
1) record
- client
# trace-cmd record -e sched -N <server IP>:12345
^C
2) record + multiple buffers
- client
# trace-cmd record -B foo -e sched -N <server IP>:12345
^C
3) extract
- client
# ./trace-cmd start -e sched
# sleep 5
# ./trace-cmd stop
# ./trace-cmd extract -N <server IP>:12345
4) extract + snapshot
- client
# ./trace-cmd start -e sched
# sleep 5
# ./trace-cmd snapshot -s
# ./trace-cmd stop
# ./trace-cmd extract -N <server IP>:12345 -s
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
Changes in V5: Client sends "-1V2\0<MAGIC_NUMBER>\00" instead of
"V2\0<MAGIC_NUMBER>\0" not to make old server create
zero length file.
Also add a protocol documentation.
Cleanup source code.
Change meaningless loop in tracecmd_msg_collect_metadata().
Changes in V4: Fix some typos, cleanups and rebase for current trace-cmd-v2.4
Change the argument of tracecmd_msg_recv()
Changes in V3: Change the license of trace-msg.c to LGPL v2.1
Changes in V2: Regacy protocol support in order to keep backward compatibility
---
Documentation/Protocol.txt | 119 ++++++++
Makefile | 2
trace-cmd.h | 11 +
trace-listen.c | 84 ++++-
trace-msg.c | 682 ++++++++++++++++++++++++++++++++++++++++++++
trace-msg.h | 27 ++
trace-output.c | 4
trace-record.c | 91 +++++-
8 files changed, 980 insertions(+), 40 deletions(-)
create mode 100644 Documentation/Protocol.txt
create mode 100644 trace-msg.c
create mode 100644 trace-msg.h
diff --git a/Documentation/Protocol.txt b/Documentation/Protocol.txt
new file mode 100644
index 0000000..49f7766
--- /dev/null
+++ b/Documentation/Protocol.txt
@@ -0,0 +1,119 @@
+Trace-cmd Protocols
+===================
+
+Index
+=====
+1. What is the trace-cmd protocol?
+2. Trace-cmd Protocol V1 (Obsolete)
+3. Trace-cmd Protocol V2
+
+
+1. What is the trace-cmd protocol?
+==================================
+ Trace-cmd can run as a remote-trace agent(server) and a client, which
+communicate over network and passing the trace data. Trace-cmd protocol
+is used for the communication between the server and the client.
+ There are 2 versions of the trace-cmd protocol. V1 protocol was simple
+text-based but hard to extend. On the other hand, V2 protocol is message
+based and extensible.
+
+
+2. Trace-cmd Protocol V1 (Obsolete)
+========================
+
+The old trace-cmd which supports V1 protocol works as follows;
+
+ <server(local)> <client(remote)>
+ listen to socket fd
+ connect to socket fd
+ accept the client
+ send "tracecmd"
+ +------------> receive "tracecmd"
+ check "tracecmd"
+ send cpus
+ receive cpus <------------+
+ print "cpus=XXX"
+ send pagesize
+ |
+ receive pagesize <--------+
+ print "pagesize=XXX"
+ send options
+ |
+ receive options <---------+
+ understand options
+ send port_array
+ +------------> receive port_array
+ understand port_array
+ send meta data
+ receive meta data <-------+
+ record meta data
+ (snip)
+ read block
+ --- start sending trace data on child processes ---
+
+ --- When client finishes sending trace data ---
+ close(socket fd)
+ read size = 0
+ close(socket fd)
+
+All messages are unstructured character strings and the messaging
+order and contents are fixed. It is impossible to extend the
+protocol without breaking the compatibility.
+
+
+3. Trace-cmd Protocol V2
+========================
+
+From the protocol V2, the structured binary message "trace-msg" is
+introduced as the communication protocol.
+
+ <server> <client>
+ listen to socket fd
+ connect to socket fd
+ accept the client
+ send "tracecmd"
+ +------------> receive "tracecmd"
+ check "tracecmd"
+ send "-1V2\0<MAGIC_NUMBER>\0" as the v2 protocol
+ receive "-1V2" <----------+
+ check "-1V2"
+ check <MAGIC_NUMBER>
+ send "V2"
+ +---------------> receive "V2"
+ check "V2"
+ send MSG_TINIT with cpus, pagesize and options
+ receive MSG_TINIT <-------+
+ perse the parameters
+ send MSG_RINIT with port_array
+ +----------------> receive MSG_RINIT
+ get port_array
+ send meta data(MSG_SENDMETA)
+ receive MSG_SENDMETA <----+
+ record meta data
+ (snip)
+ send a message to finish sending meta data
+ | (MSG_FINMETA)
+ receive MSG_FINMETA <-----+
+ read block
+ --- start sending trace data on child processes ---
+
+ --- When client finishes sending trace data ---
+ send MSG_CLOSE
+ receive MSG_CLOSE <-------+
+ close(socket fd) close(socket fd)
+
+In this version, after the client checks "tracecmd", it sends
+"-1V2\0<MAGIC_NUMBER>\0". This is for the backward compatibility.
+When the newer client tries to connect to the old server and sends
+this string to the server, the old server parses it to get the
+number of CPUs. Since "-1V2" actually becomes -1 and this is a
+wrong value, the server refuses the client. Then, the client gets
+a connection error because the server is old, so it can try to
+connect with V1 protocol again.
+
+On the other hand, if new server gets a connection from an old
+client, it can easily check whether the client uses V1 protocol
+or not by checking the first message from the client. If client
+sends a positive number, it should be a V1 protocol client.
+
+
diff --git a/Makefile b/Makefile
index cbe0eb9..9977528 100644
--- a/Makefile
+++ b/Makefile
@@ -318,7 +318,7 @@ KERNEL_SHARK_OBJS = $(TRACE_VIEW_OBJS) $(TRACE_GRAPH_OBJS) $(TRACE_GUI_OBJS) \
PEVENT_LIB_OBJS = event-parse.o trace-seq.o parse-filter.o parse-utils.o
TCMD_LIB_OBJS = $(PEVENT_LIB_OBJS) trace-util.o trace-input.o trace-ftrace.o \
trace-output.o trace-recorder.o trace-restore.o trace-usage.o \
- trace-blk-hack.o kbuffer-parse.o event-plugin.o
+ trace-blk-hack.o kbuffer-parse.o event-plugin.o trace-msg.o
PLUGIN_OBJS =
PLUGIN_OBJS += plugin_jbd2.o
diff --git a/trace-cmd.h b/trace-cmd.h
index 92b4ff2..f65f29e 100644
--- a/trace-cmd.h
+++ b/trace-cmd.h
@@ -248,6 +248,17 @@ void tracecmd_stop_recording(struct tracecmd_recorder *recorder);
void tracecmd_stat_cpu(struct trace_seq *s, int cpu);
long tracecmd_flush_recording(struct tracecmd_recorder *recorder);
+/* for clients */
+int tracecmd_msg_send_init_data(int fd);
+int tracecmd_msg_metadata_send(int fd, char *buf, int size);
+int tracecmd_msg_finish_sending_metadata(int fd);
+void tracecmd_msg_send_close_msg(void);
+
+/* for server */
+int tracecmd_msg_initial_setting(int fd, int *cpus, int *pagesize);
+int tracecmd_msg_send_port_array(int fd, int total_cpus, int *ports);
+int tracecmd_msg_collect_metadata(int ifd, int ofd);
+
/* --- Plugin handling --- */
extern struct plugin_option trace_ftrace_options[];
diff --git a/trace-listen.c b/trace-listen.c
index 18672b0..17ab184 100644
--- a/trace-listen.c
+++ b/trace-listen.c
@@ -33,6 +33,7 @@
#include <errno.h>
#include "trace-local.h"
+#include "trace-msg.h"
#define MAX_OPTION_SIZE 4096
@@ -45,10 +46,10 @@ static FILE *logfp;
static int debug;
-static int use_tcp;
-
static int backlog = 5;
+static int proto_ver;
+
#define TEMP_FILE_STR "%s.%s:%s.cpu%d", output_file, host, port, cpu
static char *get_temp_file(const char *host, const char *port, int cpu)
{
@@ -112,7 +113,6 @@ static int process_option(char *option)
return 0;
}
-static int done;
static void finish(int sig)
{
done = 1;
@@ -144,7 +144,7 @@ static void __plog(const char *prefix, const char *fmt, va_list ap,
fprintf(fp, "%.*s", r, buf);
}
-static void plog(const char *fmt, ...)
+void plog(const char *fmt, ...)
{
va_list ap;
@@ -153,7 +153,7 @@ static void plog(const char *fmt, ...)
va_end(ap);
}
-static void pdie(const char *fmt, ...)
+void pdie(const char *fmt, ...)
{
va_list ap;
char *str = "";
@@ -305,25 +305,15 @@ static int open_udp(const char *node, const char *port, int *pid,
return num_port;
}
-static int communicate_with_client(int fd, int *cpus, int *pagesize)
+/* Setup client who is using the v1 protocol */
+static int client_initial_setting(int fd, char *buf, int *cpus, int *pagesize)
{
- char buf[BUFSIZ];
char *option;
int options;
int size;
int n, s, t, i;
- /* Let the client know what we are */
- write(fd, "tracecmd", 8);
-
- /* read back the CPU count */
- n = read_string(fd, buf, BUFSIZ);
- if (n == BUFSIZ)
- /** ERROR **/
- return -1;
-
*cpus = atoi(buf);
-
plog("cpus=%d\n", *cpus);
if (*cpus < 0)
return -1;
@@ -376,6 +366,41 @@ static int communicate_with_client(int fd, int *cpus, int *pagesize)
return -1;
}
+ return 0;
+}
+
+static int communicate_with_client(int fd, int *cpus, int *pagesize)
+{
+ char buf[BUFSIZ];
+ int n;
+
+ /* Let the client know what we are */
+ write(fd, "tracecmd", 8);
+
+ /* read back the CPU count */
+ n = read_string(fd, buf, BUFSIZ);
+ if (n == BUFSIZ)
+ /** ERROR **/
+ return -1;
+
+ /* Is the client using the new protocol? */
+ if (memcmp(buf, "-1V2", 4) == 0) {
+ read(fd, buf, sizeof(V2_MAGIC));
+ if (memcmp(buf, V2_MAGIC, strlen(V2_MAGIC)) != 0) {
+ plog("Invalid magic number %s", buf);
+ return -1;
+ }
+ proto_ver = V2_PROTOCOL;
+
+ /* Let the client know we use v2 protocol */
+ write(fd, "V2", 2);
+
+ /* read the CPU count, the page size, and options */
+ if (tracecmd_msg_initial_setting(fd, cpus, pagesize) < 0)
+ return -1;
+ } else if (client_initial_setting(fd, buf, cpus, pagesize) < 0)
+ return -1;
+
if (use_tcp)
plog("Using TCP for live connection\n");
@@ -442,14 +467,20 @@ static int *create_all_readers(int cpus, const char *node, const char *port,
start_port = udp_port + 1;
}
- /* send the client a comma deliminated set of port numbers */
- for (cpu = 0; cpu < cpus; cpu++) {
- snprintf(buf, BUFSIZ, "%s%d",
- cpu ? "," : "", port_array[cpu]);
- write(fd, buf, strlen(buf));
+ if (proto_ver == V2_PROTOCOL) {
+ /* send set of port numbers to the client */
+ if (tracecmd_msg_send_port_array(fd, cpus, port_array) < 0)
+ goto out_free;
+ } else {
+ /* send the client a comma deliminated set of port numbers */
+ for (cpu = 0; cpu < cpus; cpu++) {
+ snprintf(buf, BUFSIZ, "%s%d",
+ cpu ? "," : "", port_array[cpu]);
+ write(fd, buf, strlen(buf));
+ }
+ /* end with null terminator */
+ write(fd, "\0", 1);
}
- /* end with null terminator */
- write(fd, "\0", 1);
return pid_array;
@@ -528,7 +559,10 @@ static void process_client(const char *node, const char *port, int fd)
return;
/* Now we are ready to start reading data from the client */
- collect_metadata_from_client(fd, ofd);
+ if (proto_ver == V2_PROTOCOL)
+ tracecmd_msg_collect_metadata(fd, ofd);
+ else
+ collect_metadata_from_client(fd, ofd);
/* wait a little to let our readers finish reading */
sleep(1);
diff --git a/trace-msg.c b/trace-msg.c
new file mode 100644
index 0000000..a97222c
--- /dev/null
+++ b/trace-msg.c
@@ -0,0 +1,682 @@
+/*
+ * trace-msg.c : define message protocol for communication between clients and
+ * a server
+ *
+ * Copyright (C) 2013 Hitachi, Ltd.
+ * Created by Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License (not later!)
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <errno.h>
+#include <poll.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <linux/types.h>
+
+#include "trace-cmd-local.h"
+#include "trace-msg.h"
+
+typedef __u32 u32;
+typedef __be32 be32;
+
+#define TRACECMD_MSG_MAX_LEN BUFSIZ
+
+ /* size + cmd */
+#define TRACECMD_MSG_HDR_LEN ((sizeof(be32)) + (sizeof(be32)))
+
+ /* + size of the metadata */
+#define TRACECMD_MSG_META_MIN_LEN \
+ ((TRACECMD_MSG_HDR_LEN) + (sizeof(be32)))
+
+ /* - header size for error msg */
+#define TRACECMD_MSG_META_MAX_LEN \
+((TRACECMD_MSG_MAX_LEN) - (TRACECMD_MSG_META_MIN_LEN) - TRACECMD_MSG_HDR_LEN)
+
+ /* size + opt_cmd + size of str */
+#define TRACECMD_OPT_MIN_LEN \
+ ((sizeof(be32)) + (sizeof(be32)) + (sizeof(be32)))
+
+
+#define CPU_MAX 256
+
+/* for both client and server */
+bool use_tcp;
+int cpu_count;
+
+/* for client */
+static int psfd;
+unsigned int page_size;
+int *client_ports;
+bool send_metadata;
+
+/* for server */
+static int *port_array;
+bool done;
+
+struct tracecmd_msg_str {
+ be32 size;
+ char *buf;
+} __attribute__((packed));
+
+struct tracecmd_msg_opt {
+ be32 size;
+ be32 opt_cmd;
+ struct tracecmd_msg_str str;
+};
+
+struct tracecmd_msg_tinit {
+ be32 cpus;
+ be32 page_size;
+ be32 opt_num;
+ struct tracecmd_msg_opt *opt;
+} __attribute__((packed));
+
+struct tracecmd_msg_rinit {
+ be32 cpus;
+ be32 port_array[CPU_MAX];
+} __attribute__((packed));
+
+struct tracecmd_msg_meta {
+ struct tracecmd_msg_str str;
+};
+
+struct tracecmd_msg_error {
+ be32 size;
+ be32 cmd;
+ union {
+ struct tracecmd_msg_tinit tinit;
+ struct tracecmd_msg_rinit rinit;
+ struct tracecmd_msg_meta meta;
+ } data;
+} __attribute__((packed));
+
+enum tracecmd_msg_cmd {
+ MSG_CLOSE = 1,
+ MSG_TINIT = 4,
+ MSG_RINIT = 5,
+ MSG_SENDMETA = 6,
+ MSG_FINMETA = 7,
+};
+
+struct tracecmd_msg {
+ be32 size;
+ be32 cmd;
+ union {
+ struct tracecmd_msg_tinit tinit;
+ struct tracecmd_msg_rinit rinit;
+ struct tracecmd_msg_meta meta;
+ struct tracecmd_msg_error err;
+ } data;
+} __attribute__((packed));
+
+struct tracecmd_msg *errmsg;
+
+static ssize_t msg_do_write_check(int fd, struct tracecmd_msg *msg)
+{
+ return __do_write_check(fd, msg, ntohl(msg->size));
+}
+
+static void tracecmd_msg_init(u32 cmd, u32 len, struct tracecmd_msg *msg)
+{
+ memset(msg, 0, len);
+ msg->size = htonl(len);
+ msg->cmd = htonl(cmd);
+}
+
+static int tracecmd_msg_alloc(u32 cmd, u32 len, struct tracecmd_msg **msg)
+{
+ len += TRACECMD_MSG_HDR_LEN;
+ *msg = malloc(len);
+ if (!*msg)
+ return -ENOMEM;
+
+ tracecmd_msg_init(cmd, len, *msg);
+ return 0;
+}
+
+static void bufcpy(void *dest, u32 offset, const void *buf, u32 buflen)
+{
+ memcpy(dest+offset, buf, buflen);
+}
+
+enum msg_opt_command {
+ MSGOPT_USETCP = 1,
+};
+
+static int add_option_to_tinit(u32 cmd, const char *buf,
+ struct tracecmd_msg *msg, int offset)
+{
+ struct tracecmd_msg_opt *opt;
+ u32 len = TRACECMD_OPT_MIN_LEN;
+ u32 buflen = 0;
+
+ if (buf) {
+ buflen = strlen(buf);
+ len += buflen;
+ }
+
+ opt = malloc(len);
+ if (!opt)
+ return -ENOMEM;
+
+ opt->size = htonl(len);
+ opt->opt_cmd = htonl(cmd);
+ opt->str.size = htonl(buflen);
+
+ if (buf)
+ bufcpy(opt, TRACECMD_OPT_MIN_LEN, buf, buflen);
+
+ /* add option to msg */
+ bufcpy(msg, offset, opt, ntohl(opt->size));
+
+ free(opt);
+ return len;
+}
+
+static int add_options_to_tinit(struct tracecmd_msg *msg)
+{
+ int offset = offsetof(struct tracecmd_msg, data.tinit.opt);
+ int ret;
+
+ if (use_tcp) {
+ ret = add_option_to_tinit(MSGOPT_USETCP, NULL, msg, offset);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int make_tinit(struct tracecmd_msg *msg)
+{
+ int opt_num = 0;
+ int ret = 0;
+
+ if (use_tcp)
+ opt_num++;
+
+ if (opt_num) {
+ ret = add_options_to_tinit(msg);
+ if (ret < 0)
+ return ret;
+ }
+
+ msg->data.tinit.cpus = htonl(cpu_count);
+ msg->data.tinit.page_size = htonl(page_size);
+ msg->data.tinit.opt_num = htonl(opt_num);
+
+ return 0;
+}
+
+static int make_rinit(struct tracecmd_msg *msg)
+{
+ int i;
+ u32 offset = TRACECMD_MSG_HDR_LEN;
+ be32 port;
+
+ msg->data.rinit.cpus = htonl(cpu_count);
+
+ for (i = 0; i < cpu_count; i++) {
+ /* + rrqports->cpus or rrqports->port_array[i] */
+ offset += sizeof(be32);
+ port = htonl(port_array[i]);
+ bufcpy(msg, offset, &port, sizeof(be32) * cpu_count);
+ }
+
+ return 0;
+}
+
+static u32 tracecmd_msg_get_body_length(u32 cmd)
+{
+ struct tracecmd_msg *msg;
+ u32 len = 0;
+
+ switch (cmd) {
+ case MSG_TINIT:
+ len = sizeof(msg->data.tinit.cpus)
+ + sizeof(msg->data.tinit.page_size)
+ + sizeof(msg->data.tinit.opt_num);
+
+ /*
+ * If we are using IPV4 and our page size is greater than
+ * or equal to 64K, we need to punt and use TCP. :-(
+ */
+
+ /* TODO, test for ipv4 */
+ if (page_size >= UDP_MAX_PACKET) {
+ warning("page size too big for UDP using TCP in live read");
+ use_tcp = true;
+ }
+
+ if (use_tcp)
+ len += TRACECMD_OPT_MIN_LEN;
+
+ return len;
+ case MSG_RINIT:
+ return sizeof(msg->data.rinit.cpus)
+ + sizeof(msg->data.rinit.port_array);
+ case MSG_SENDMETA:
+ return TRACECMD_MSG_MAX_LEN - TRACECMD_MSG_HDR_LEN;
+ case MSG_CLOSE:
+ case MSG_FINMETA:
+ break;
+ }
+
+ return 0;
+}
+
+static int tracecmd_msg_make_body(u32 cmd, struct tracecmd_msg *msg)
+{
+ switch (cmd) {
+ case MSG_TINIT:
+ return make_tinit(msg);
+ case MSG_RINIT:
+ return make_rinit(msg);
+ case MSG_CLOSE:
+ case MSG_SENDMETA: /* meta data is not stored here. */
+ case MSG_FINMETA:
+ break;
+ }
+
+ return 0;
+}
+
+static int tracecmd_msg_create(u32 cmd, struct tracecmd_msg **msg)
+{
+ u32 len = 0;
+ int ret = 0;
+
+ len = tracecmd_msg_get_body_length(cmd);
+ if (len > (TRACECMD_MSG_MAX_LEN - TRACECMD_MSG_HDR_LEN)) {
+ plog("Exceed maximum message size cmd=%d\n", cmd);
+ return -EINVAL;
+ }
+
+ ret = tracecmd_msg_alloc(cmd, len, msg);
+ if (ret < 0)
+ return ret;
+
+ ret = tracecmd_msg_make_body(cmd, *msg);
+ if (ret < 0)
+ free(*msg);
+
+ return ret;
+}
+
+static int tracecmd_msg_send(int fd, u32 cmd)
+{
+ struct tracecmd_msg *msg = NULL;
+ int ret = 0;
+
+ if (cmd > MSG_FINMETA) {
+ plog("Unsupported command: %d\n", cmd);
+ return -EINVAL;
+ }
+
+ ret = tracecmd_msg_create(cmd, &msg);
+ if (ret < 0)
+ return ret;
+
+ ret = msg_do_write_check(fd, msg);
+ if (ret < 0)
+ ret = -ECOMM;
+
+ free(msg);
+ return ret;
+}
+
+static int tracecmd_msg_read_extra(int fd, void *buf, u32 size, int *n)
+{
+ int r = 0;
+
+ do {
+ r = read(fd, buf + *n, size);
+ if (r < 0) {
+ if (errno == EINTR)
+ continue;
+ return -errno;
+ } else if (!r)
+ return -ENOTCONN;
+ size -= r;
+ *n += r;
+ } while (size);
+
+ return 0;
+}
+
+/*
+ * Read header information of msg first, then read all data
+ */
+static int tracecmd_msg_recv(int fd, struct tracecmd_msg *msg)
+{
+ u32 size = 0;
+ int n = 0;
+ int ret;
+
+ ret = tracecmd_msg_read_extra(fd, msg, TRACECMD_MSG_HDR_LEN, &n);
+ if (ret < 0)
+ return ret;
+
+ size = ntohl(msg->size);
+ if (size > TRACECMD_MSG_MAX_LEN)
+ /* too big */
+ goto error;
+ else if (size < TRACECMD_MSG_HDR_LEN)
+ /* too small */
+ goto error;
+ else if (size > TRACECMD_MSG_HDR_LEN) {
+ size -= TRACECMD_MSG_HDR_LEN;
+ return tracecmd_msg_read_extra(fd, msg, size, &n);
+ }
+
+ return 0;
+error:
+ plog("Receive an invalid message(size=%d)\n", size);
+ return -ENOMSG;
+}
+
+static void *tracecmd_msg_buf_access(struct tracecmd_msg *msg, int offset)
+{
+ return (void *)msg + offset;
+}
+
+static int tracecmd_msg_wait_for_msg(int fd, struct tracecmd_msg *msg)
+{
+ u32 cmd;
+ int ret;
+
+ ret = tracecmd_msg_recv(fd, msg);
+ if (ret < 0)
+ return ret;
+
+ cmd = ntohl(msg->cmd);
+ if (cmd == MSG_CLOSE)
+ return -ECONNABORTED;
+
+ return 0;
+}
+
+static int tracecmd_msg_send_and_wait_for_msg(int fd, u32 cmd, struct tracecmd_msg *msg)
+{
+ int ret;
+
+ ret = tracecmd_msg_send(fd, cmd);
+ if (ret < 0)
+ return ret;
+
+ ret = tracecmd_msg_wait_for_msg(fd, msg);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+int tracecmd_msg_send_init_data(int fd)
+{
+ char buf[TRACECMD_MSG_MAX_LEN];
+ struct tracecmd_msg *msg;
+ int i, cpus;
+ int ret;
+
+ msg = (struct tracecmd_msg *)buf;
+ ret = tracecmd_msg_send_and_wait_for_msg(fd, MSG_TINIT, msg);
+ if (ret < 0)
+ return ret;
+
+ cpus = ntohl(msg->data.rinit.cpus);
+ client_ports = malloc_or_die(sizeof(int) * cpus);
+ for (i = 0; i < cpus; i++)
+ client_ports[i] = ntohl(msg->data.rinit.port_array[i]);
+
+ /* Next, send meta data */
+ send_metadata = true;
+
+ return 0;
+}
+
+static bool process_option(struct tracecmd_msg_opt *opt)
+{
+ /* currently the only option we have is to us TCP */
+ if (ntohl(opt->opt_cmd) == MSGOPT_USETCP) {
+ use_tcp = true;
+ return true;
+ }
+ return false;
+}
+
+static void error_operation_for_server(struct tracecmd_msg *msg)
+{
+ u32 cmd;
+
+ cmd = ntohl(msg->cmd);
+
+ warning("Message: cmd=%d size=%d\n", cmd, ntohl(msg->size));
+}
+
+#define MAX_OPTION_SIZE 4096
+
+int tracecmd_msg_initial_setting(int fd, int *cpus, int *pagesize)
+{
+ struct tracecmd_msg *msg;
+ struct tracecmd_msg_opt *opt;
+ char buf[TRACECMD_MSG_MAX_LEN];
+ int offset = offsetof(struct tracecmd_msg, data.tinit.opt);
+ int options, i, s;
+ int ret;
+ u32 size = 0;
+ u32 cmd;
+
+ msg = (struct tracecmd_msg *)buf;
+ ret = tracecmd_msg_recv(fd, msg);
+ if (ret < 0)
+ return ret;
+
+ cmd = ntohl(msg->cmd);
+ if (cmd != MSG_TINIT) {
+ ret = -EINVAL;
+ goto error;
+ }
+
+ *cpus = ntohl(msg->data.tinit.cpus);
+ plog("cpus=%d\n", *cpus);
+ if (*cpus < 0) {
+ ret = -EINVAL;
+ goto error;
+ }
+
+ *pagesize = ntohl(msg->data.tinit.page_size);
+ plog("pagesize=%d\n", *pagesize);
+ if (*pagesize <= 0) {
+ ret = -EINVAL;
+ goto error;
+ }
+
+ options = ntohl(msg->data.tinit.opt_num);
+ for (i = 0; i < options; i++) {
+ offset += size;
+ opt = tracecmd_msg_buf_access(msg, offset);
+ size = ntohl(opt->size);
+ /* prevent a client from killing us */
+ if (size > MAX_OPTION_SIZE) {
+ plog("Exceed MAX_OPTION_SIZE\n");
+ ret = -EINVAL;
+ goto error;
+ }
+ s = process_option(opt);
+ /* do we understand this option? */
+ if (!s) {
+ plog("Cannot understand(%d:%d:%d)\n",
+ i, ntohl(opt->size), ntohl(opt->opt_cmd));
+ ret = -EINVAL;
+ goto error;
+ }
+ }
+
+ return 0;
+
+error:
+ error_operation_for_server(msg);
+ return ret;
+}
+
+int tracecmd_msg_send_port_array(int fd, int total_cpus, int *ports)
+{
+ int ret;
+
+ cpu_count = total_cpus;
+ port_array = ports;
+
+ ret = tracecmd_msg_send(fd, MSG_RINIT);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+void tracecmd_msg_send_close_msg(void)
+{
+ tracecmd_msg_send(psfd, MSG_CLOSE);
+}
+
+static void make_meta(const char *buf, int buflen, struct tracecmd_msg *msg)
+{
+ int offset = offsetof(struct tracecmd_msg, data.meta.str.buf);
+
+ msg->data.meta.str.size = htonl(buflen);
+ bufcpy(msg, offset, buf, buflen);
+}
+
+int tracecmd_msg_metadata_send(int fd, char *buf, int size)
+{
+ struct tracecmd_msg *msg;
+ int n, len;
+ int ret;
+ int count = 0;
+
+ ret = tracecmd_msg_create(MSG_SENDMETA, &msg);
+ if (ret < 0)
+ return ret;
+
+ n = size;
+ do {
+ if (n > TRACECMD_MSG_META_MAX_LEN) {
+ make_meta(buf+count, TRACECMD_MSG_META_MAX_LEN, msg);
+ n -= TRACECMD_MSG_META_MAX_LEN;
+ count += TRACECMD_MSG_META_MAX_LEN;
+ } else {
+ make_meta(buf+count, n, msg);
+ /*
+ * TRACECMD_MSG_META_MAX_LEN is stored in msg->size,
+ * so update the size to the correct value.
+ */
+ len = TRACECMD_MSG_META_MIN_LEN + n;
+ msg->size = htonl(len);
+ n = 0;
+ }
+
+ ret = msg_do_write_check(fd, msg);
+ if (ret < 0)
+ break;
+ } while (n);
+
+ free(msg);
+ return ret;
+}
+
+int tracecmd_msg_finish_sending_metadata(int fd)
+{
+ int ret;
+
+ ret = tracecmd_msg_send(fd, MSG_FINMETA);
+ if (ret < 0)
+ return ret;
+
+ /* psfd will be used for closing */
+ psfd = fd;
+ return 0;
+}
+
+int tracecmd_msg_collect_metadata(int ifd, int ofd)
+{
+ struct tracecmd_msg *msg;
+ char buf[TRACECMD_MSG_MAX_LEN];
+ u32 s, t, n, cmd;
+ int offset = TRACECMD_MSG_META_MIN_LEN;
+ int ret;
+
+ msg = (struct tracecmd_msg *)buf;
+
+ do {
+ ret = tracecmd_msg_recv(ifd, msg);
+ if (ret < 0) {
+ warning("reading client");
+ return ret;
+ }
+
+ cmd = ntohl(msg->cmd);
+ if (cmd == MSG_FINMETA) {
+ /* Finish receiving meta data */
+ break;
+ } else if (cmd != MSG_SENDMETA)
+ goto error;
+
+ n = ntohl(msg->data.meta.str.size);
+ t = n;
+ s = 0;
+ do {
+ s = write(ofd, buf+s+offset, t);
+ if (s < 0) {
+ if (errno == EINTR)
+ continue;
+ warning("writing to file");
+ return -errno;
+ }
+ t -= s;
+ s = n - t;
+ } while (t);
+ } while (!done);
+
+ /* check the finish message of the client */
+ if (!done) {
+ ret = tracecmd_msg_recv(ifd, msg);
+ if (ret < 0) {
+ warning("reading client");
+ return ret;
+ }
+
+ msg = (struct tracecmd_msg *)buf;
+ cmd = ntohl(msg->cmd);
+ if (cmd != MSG_CLOSE) {
+ warning("Not accept the message %d", ntohl(msg->cmd));
+ ret = -EINVAL;
+ goto error;
+ }
+ /* Finish this connection */
+ }
+
+ return 0;
+
+error:
+ error_operation_for_server(msg);
+ return ret;
+}
diff --git a/trace-msg.h b/trace-msg.h
new file mode 100644
index 0000000..b23e72b
--- /dev/null
+++ b/trace-msg.h
@@ -0,0 +1,27 @@
+#ifndef _TRACE_MSG_H_
+#define _TRACE_MSG_H_
+
+#include <stdbool.h>
+
+#define UDP_MAX_PACKET (65536 - 20)
+#define V2_MAGIC "677768\0"
+
+#define V1_PROTOCOL 1
+#define V2_PROTOCOL 2
+
+/* for both client and server */
+extern bool use_tcp;
+extern int cpu_count;
+
+/* for client */
+extern unsigned int page_size;
+extern int *client_ports;
+extern bool send_metadata;
+
+/* for server */
+extern bool done;
+
+void plog(const char *fmt, ...);
+void pdie(const char *fmt, ...);
+
+#endif /* _TRACE_MSG_H_ */
diff --git a/trace-output.c b/trace-output.c
index b033baa..4661870 100644
--- a/trace-output.c
+++ b/trace-output.c
@@ -37,6 +37,7 @@
#include "trace-cmd-local.h"
#include "list.h"
+#include "trace-msg.h"
#include "version.h"
/* We can't depend on the host size for size_t, all must be 64 bit */
@@ -82,6 +83,9 @@ struct list_event_system {
static stsize_t
do_write_check(struct tracecmd_output *handle, void *data, tsize_t size)
{
+ if (send_metadata)
+ return tracecmd_msg_metadata_send(handle->fd, data, size);
+
return __do_write_check(handle->fd, data, size);
}
diff --git a/trace-record.c b/trace-record.c
index a3a07e1..19711df 100644
--- a/trace-record.c
+++ b/trace-record.c
@@ -45,6 +45,7 @@
#include <errno.h>
#include "trace-local.h"
+#include "trace-msg.h"
#define _STR(x) #x
#define STR(x) _STR(x)
@@ -59,25 +60,17 @@
#define STAMP "stamp"
#define FUNC_STACK_TRACE "func_stack_trace"
-#define UDP_MAX_PACKET (65536 - 20)
-
static int rt_prio;
-static int use_tcp;
-
-static unsigned int page_size;
-
static const char *output_file = "trace.dat";
static int latency;
static int sleep_time = 1000;
-static int cpu_count;
static int recorder_threads;
static int *pids;
static int buffers;
static char *host;
-static int *client_ports;
static int sfd;
static struct tracecmd_output *network_handle;
@@ -99,6 +92,7 @@ static unsigned recorder_flags;
/* Try a few times to get an accurate date */
static int date2ts_tries = 5;
+static int proto_ver = V2_PROTOCOL;
static struct func_list *graph_funcs;
static int func_stack;
@@ -1821,20 +1815,26 @@ static int create_recorder(struct buffer_instance *instance, int cpu, int extrac
exit(0);
}
-static void communicate_with_listener(int fd)
+static void check_first_msg_from_server(int fd)
{
char buf[BUFSIZ];
- ssize_t n;
- int cpu, i;
- n = read(fd, buf, 8);
+ read(fd, buf, 8);
/* Make sure the server is the tracecmd server */
if (memcmp(buf, "tracecmd", 8) != 0)
die("server not tracecmd server");
+}
- /* write the number of CPUs we have (in ASCII) */
+static void communicate_with_listener_v1(int fd)
+{
+ char buf[BUFSIZ];
+ ssize_t n;
+ int cpu, i;
+
+ check_first_msg_from_server(fd);
+ /* write the number of CPUs we have (in ASCII) */
sprintf(buf, "%d", cpu_count);
/* include \0 */
@@ -1889,6 +1889,52 @@ static void communicate_with_listener(int fd)
}
}
+static void communicate_with_listener_v2(int fd)
+{
+ if (tracecmd_msg_send_init_data(fd) < 0)
+ die("Cannot communicate with server");
+}
+
+static void check_protocol_version(int fd)
+{
+ char buf[BUFSIZ];
+ int ret;
+
+ check_first_msg_from_server(fd);
+
+ /*
+ * Write dummy CPU number(-1) in order to make old server not create
+ * zero length file, the protocol version(V2), the magic number,
+ * and the dummy option(0) (in ASCII). The client understands whether
+ * the client uses the v2 protocol or not by checking a reply message
+ * from the server. If the message is "V2", the server uses v2
+ * protocol. On the other hands, if the message is just number strings,
+ * the server returned port numbers. So, in that time, the client
+ * understands the server uses the v1 protocol. However, the old server
+ * tells the client port numbers after reading cpu_count, page_size,
+ * and option. So, we add the dummy number (the magic number and 0
+ * option) to the first client message.
+ */
+ ret = write(fd, "-1V2\0"V2_MAGIC"\0", strlen(V2_MAGIC)+6);
+ if (ret < 0)
+ die("Cannot send initial message");
+
+ /* read a reply message */
+ ret = read(fd, buf, BUFSIZ);
+ if (ret < 0) {
+ if (errno == ECONNRESET) {
+ /* the server uses the v1 protocol, so we'll use it */
+ proto_ver = V1_PROTOCOL;
+ plog("Use the v1 protocol\n");
+ } else
+ die("Cannot read initial message");
+ } else {
+ if (memcmp(buf, "V2", 2) != 0)
+ die("Cannot handle the protocol %s", buf);
+ /* OK, let's use v2 protocol */
+ }
+}
+
static void setup_network(void)
{
struct addrinfo hints;
@@ -1916,6 +1962,7 @@ static void setup_network(void)
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
+again:
s = getaddrinfo(server, port, &hints, &result);
if (s != 0)
die("getaddrinfo: %s", gai_strerror(s));
@@ -1936,16 +1983,32 @@ static void setup_network(void)
freeaddrinfo(result);
- communicate_with_listener(sfd);
+ if (proto_ver == V2_PROTOCOL) {
+ check_protocol_version(sfd);
+ if (proto_ver == V1_PROTOCOL) {
+ /* reconnect to the server for using the v1 protocol */
+ close(sfd);
+ goto again;
+ }
+ communicate_with_listener_v2(sfd);
+ }
+
+ if (proto_ver == V1_PROTOCOL)
+ communicate_with_listener_v1(sfd);
/* Now create the handle through this socket */
network_handle = tracecmd_create_init_fd_glob(sfd, listed_events);
+ if (proto_ver == V2_PROTOCOL)
+ tracecmd_msg_finish_sending_metadata(sfd);
+
/* OK, we are all set, let'r rip! */
}
static void finish_network(void)
{
+ if (proto_ver == V2_PROTOCOL)
+ tracecmd_msg_send_close_msg();
close(sfd);
free(host);
}
^ permalink raw reply related [flat|nested] 14+ messages in thread* Re: [PATCH trace-cmd V5 2/6] trace-cmd/listen: Introduce trace-msg protocol (protocol v2)
2014-12-22 17:47 ` [PATCH trace-cmd V5 2/6] trace-cmd/listen: Introduce trace-msg protocol (protocol v2) Masami Hiramatsu
@ 2015-05-20 3:12 ` Steven Rostedt
2015-05-22 4:53 ` Masami Hiramatsu
0 siblings, 1 reply; 14+ messages in thread
From: Steven Rostedt @ 2015-05-20 3:12 UTC (permalink / raw)
To: Masami Hiramatsu
Cc: Hidehiro Kawai, yrl.pp-manager.tt, Aaron Fabbri, linux-kernel,
Divya Vyas
On Mon, 22 Dec 2014 12:47:50 -0500
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:
> Introduce new trace-msg protocol (protocol V2) for more
> flexible messaging. V1 protocol which is currently used
> by trace-cmd server and client, is based on a simple
> text messages. It is impossible to extend the protocol
> without breaking backward compatibility. The V2 protocol
> introduced by this patch is a binary message-based protocol
> and it is able to extend by just adding message tags.
>
> <How to test>
> [1] Backward compatibility checks
> We need to test backward compatibility of this patch for old
> trace-cmds(client/server). So, this patch was tested for [2]
> command checks in following 3 types:
>
> <client> <server>
> new old
> old new
> new new
>
> [2] Command checks
> - server (common)
> # trace-cmd listen -p 12345
>
> 1) record
> - client
> # trace-cmd record -e sched -N <server IP>:12345
> ^C
>
> 2) record + multiple buffers
> - client
> # trace-cmd record -B foo -e sched -N <server IP>:12345
> ^C
>
> 3) extract
> - client
> # ./trace-cmd start -e sched
> # sleep 5
> # ./trace-cmd stop
> # ./trace-cmd extract -N <server IP>:12345
>
> 4) extract + snapshot
> - client
> # ./trace-cmd start -e sched
> # sleep 5
> # ./trace-cmd snapshot -s
> # ./trace-cmd stop
> # ./trace-cmd extract -N <server IP>:12345 -s
>
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
>
Hi Masami,
Is this a rewrite of Yoshihiro's work? I would like to keep the From:
from him if he did the initial work, and add both of your
signed-off-bys.
Note, I did pull in some of his patches to a temp branch and extended
on them. I'll look to see if I have to modify this code as well.
Thanks!
-- Steve
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH trace-cmd V5 2/6] trace-cmd/listen: Introduce trace-msg protocol (protocol v2)
2015-05-20 3:12 ` Steven Rostedt
@ 2015-05-22 4:53 ` Masami Hiramatsu
2015-05-22 9:14 ` Steven Rostedt
0 siblings, 1 reply; 14+ messages in thread
From: Masami Hiramatsu @ 2015-05-22 4:53 UTC (permalink / raw)
To: Steven Rostedt
Cc: Hidehiro Kawai, yrl.pp-manager.tt, Aaron Fabbri, linux-kernel,
Divya Vyas
Hi Steven,
On 2015/05/20 12:12, Steven Rostedt wrote:
> On Mon, 22 Dec 2014 12:47:50 -0500
> Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:
>
>> Introduce new trace-msg protocol (protocol V2) for more
>> flexible messaging. V1 protocol which is currently used
>> by trace-cmd server and client, is based on a simple
>> text messages. It is impossible to extend the protocol
>> without breaking backward compatibility. The V2 protocol
>> introduced by this patch is a binary message-based protocol
>> and it is able to extend by just adding message tags.
>>
>> <How to test>
>> [1] Backward compatibility checks
>> We need to test backward compatibility of this patch for old
>> trace-cmds(client/server). So, this patch was tested for [2]
>> command checks in following 3 types:
>>
>> <client> <server>
>> new old
>> old new
>> new new
>>
>> [2] Command checks
>> - server (common)
>> # trace-cmd listen -p 12345
>>
>> 1) record
>> - client
>> # trace-cmd record -e sched -N <server IP>:12345
>> ^C
>>
>> 2) record + multiple buffers
>> - client
>> # trace-cmd record -B foo -e sched -N <server IP>:12345
>> ^C
>>
>> 3) extract
>> - client
>> # ./trace-cmd start -e sched
>> # sleep 5
>> # ./trace-cmd stop
>> # ./trace-cmd extract -N <server IP>:12345
>>
>> 4) extract + snapshot
>> - client
>> # ./trace-cmd start -e sched
>> # sleep 5
>> # ./trace-cmd snapshot -s
>> # ./trace-cmd stop
>> # ./trace-cmd extract -N <server IP>:12345 -s
>>
>> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
>>
>
> Hi Masami,
>
> Is this a rewrite of Yoshihiro's work? I would like to keep the From:
> from him if he did the initial work, and add both of your
> signed-off-bys.
OK, but actually he left Hitachi, so his e-mail address is invalid...
Is that OK to use that old email address?
> Note, I did pull in some of his patches to a temp branch and extended
> on them. I'll look to see if I have to modify this code as well.
OK, thanks!
>
> Thanks!
>
> -- Steve
>
>
--
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@hitachi.com
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH trace-cmd V5 2/6] trace-cmd/listen: Introduce trace-msg protocol (protocol v2)
2015-05-22 4:53 ` Masami Hiramatsu
@ 2015-05-22 9:14 ` Steven Rostedt
2015-05-24 1:59 ` Masami Hiramatsu
0 siblings, 1 reply; 14+ messages in thread
From: Steven Rostedt @ 2015-05-22 9:14 UTC (permalink / raw)
To: Masami Hiramatsu
Cc: Hidehiro Kawai, yrl.pp-manager.tt, Aaron Fabbri, linux-kernel,
Divya Vyas
On Fri, 22 May 2015 13:53:01 +0900
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:
> > Hi Masami,
> >
> > Is this a rewrite of Yoshihiro's work? I would like to keep the From:
> > from him if he did the initial work, and add both of your
> > signed-off-bys.
>
> OK, but actually he left Hitachi, so his e-mail address is invalid...
> Is that OK to use that old email address?
Yeah, as he was the original author. But add your signed-off-by too, as
people will know you are taking over.
-- Steve
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Re: [PATCH trace-cmd V5 2/6] trace-cmd/listen: Introduce trace-msg protocol (protocol v2)
2015-05-22 9:14 ` Steven Rostedt
@ 2015-05-24 1:59 ` Masami Hiramatsu
0 siblings, 0 replies; 14+ messages in thread
From: Masami Hiramatsu @ 2015-05-24 1:59 UTC (permalink / raw)
To: Steven Rostedt
Cc: Hidehiro Kawai, Aaron Fabbri, linux-kernel, Divya Vyas,
yoshihiro.yunomae
Hi,
On 2015/05/22 18:14, Steven Rostedt wrote:
> On Fri, 22 May 2015 13:53:01 +0900
> Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:
>
>
>>> Hi Masami,
>>>
>>> Is this a rewrite of Yoshihiro's work? I would like to keep the From:
>>> from him if he did the initial work, and add both of your
>>> signed-off-bys.
>>
>> OK, but actually he left Hitachi, so his e-mail address is invalid...
>> Is that OK to use that old email address?
>
> Yeah, as he was the original author. But add your signed-off-by too, as
> people will know you are taking over.
OK, I'll update it with original one and mine :)
Thank you,
--
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@hitachi.com
^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH trace-cmd V5 3/6] trace-cmd/msg: Use poll(2) to wait for a message
2014-12-22 17:47 [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache Masami Hiramatsu
` (2 preceding siblings ...)
2014-12-22 17:47 ` [PATCH trace-cmd V5 2/6] trace-cmd/listen: Introduce trace-msg protocol (protocol v2) Masami Hiramatsu
@ 2014-12-22 17:47 ` Masami Hiramatsu
2014-12-22 17:48 ` [PATCH trace-cmd V5 4/6] trace-cmd/virt-server: Add virt-server mode for a virtualization environment Masami Hiramatsu
` (3 subsequent siblings)
7 siblings, 0 replies; 14+ messages in thread
From: Masami Hiramatsu @ 2014-12-22 17:47 UTC (permalink / raw)
To: Steven Rostedt
Cc: Hidehiro Kawai, yrl.pp-manager.tt, Aaron Fabbri, linux-kernel,
Divya Vyas
Use poll(2) to wait for a message. If a client/server cannot send a message for
any reasons, the current server/client will wait in a blocking read operation.
So, we use poll(2) for avoiding remaining in a blocking state.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
Changes in V4: Change the argument of tracecmd_msg_recv_wait()
Fix some typos
---
trace-msg.c | 42 ++++++++++++++++++++++++++++++++++++------
1 file changed, 36 insertions(+), 6 deletions(-)
diff --git a/trace-msg.c b/trace-msg.c
index a97222c..3228559 100644
--- a/trace-msg.c
+++ b/trace-msg.c
@@ -395,6 +395,27 @@ error:
return -ENOMSG;
}
+#define MSG_WAIT_MSEC 5000
+
+/*
+ * A return value of 0 indicates time-out
+ */
+static int tracecmd_msg_recv_wait(int fd, struct tracecmd_msg *msg)
+{
+ struct pollfd pfd;
+ int ret;
+
+ pfd.fd = fd;
+ pfd.events = POLLIN;
+ ret = poll(&pfd, 1, MSG_WAIT_MSEC);
+ if (ret < 0)
+ return -errno;
+ else if (ret == 0)
+ return -ETIMEDOUT;
+
+ return tracecmd_msg_recv(fd, msg);
+}
+
static void *tracecmd_msg_buf_access(struct tracecmd_msg *msg, int offset)
{
return (void *)msg + offset;
@@ -405,9 +426,12 @@ static int tracecmd_msg_wait_for_msg(int fd, struct tracecmd_msg *msg)
u32 cmd;
int ret;
- ret = tracecmd_msg_recv(fd, msg);
- if (ret < 0)
+ ret = tracecmd_msg_recv_wait(fd, msg);
+ if (ret < 0) {
+ if (ret == -ETIMEDOUT)
+ warning("Connection timed out\n");
return ret;
+ }
cmd = ntohl(msg->cmd);
if (cmd == MSG_CLOSE)
@@ -487,9 +511,12 @@ int tracecmd_msg_initial_setting(int fd, int *cpus, int *pagesize)
u32 cmd;
msg = (struct tracecmd_msg *)buf;
- ret = tracecmd_msg_recv(fd, msg);
- if (ret < 0)
+ ret = tracecmd_msg_recv_wait(fd, msg);
+ if (ret < 0) {
+ if (ret == -ETIMEDOUT)
+ warning("Connection timed out\n");
return ret;
+ }
cmd = ntohl(msg->cmd);
if (cmd != MSG_TINIT) {
@@ -627,9 +654,12 @@ int tracecmd_msg_collect_metadata(int ifd, int ofd)
msg = (struct tracecmd_msg *)buf;
do {
- ret = tracecmd_msg_recv(ifd, msg);
+ ret = tracecmd_msg_recv_wait(ifd, msg);
if (ret < 0) {
- warning("reading client");
+ if (ret == -ETIMEDOUT)
+ warning("Connection timed out\n");
+ else
+ warning("reading client");
return ret;
}
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH trace-cmd V5 4/6] trace-cmd/virt-server: Add virt-server mode for a virtualization environment
2014-12-22 17:47 [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache Masami Hiramatsu
` (3 preceding siblings ...)
2014-12-22 17:47 ` [PATCH trace-cmd V5 3/6] trace-cmd/msg: Use poll(2) to wait for a message Masami Hiramatsu
@ 2014-12-22 17:48 ` Masami Hiramatsu
2014-12-22 17:48 ` [PATCH trace-cmd V5 5/6] trace-cmd/record: Add --virt option for record mode Masami Hiramatsu
` (2 subsequent siblings)
7 siblings, 0 replies; 14+ messages in thread
From: Masami Hiramatsu @ 2014-12-22 17:48 UTC (permalink / raw)
To: Steven Rostedt
Cc: Hidehiro Kawai, yrl.pp-manager.tt, Aaron Fabbri, linux-kernel,
Divya Vyas
Add the virt-server mode for a virtualization environment
based on the listen mode. This mode works as a client/server
mode over not TCP/UDP but virtio-serial channel. Since the
troughput of trace-data can be huge, traditional IP network
easily gets higher overhead. Using virtio-serial can reduce
overhead because it can skip guest/host TCP/IP network stack.
virt-server uses two kinds of virtio-serial I/Fs:
(1) agent-ctl-path(UNIX domain socket)
=> control path of an agent trace-cmd each guest
(2) trace-path-cpuX(named pipe)
=> trace data path each vcpu
Those I/Fs must be defined as below paths:
(1) /tmp/trace-cmd/virt/agent-ctl-path
(2) /tmp/trace-cmd/virt/<guest domain>/trace-path-cpuX
If we run virt-server, agent-ctl-path I/F is automatically created because
virt-server operates as a server mode of UNIX domain socket. However,
trace-path-cpuX is not automatically created because we need to separate
trace data for each guests.
Over the virtio-serial, V2 protocol is slightly changed since
the server can not notice when the client connects. The detail
is described in Documentation/Protocol.txt.
NOTE:
This feature requests to disable(or make permissive) selinux
since qemu has to open a (non-registered) unix domain socket.
<How to set up>
1. Run virt-server on a host before booting guests
# trace-cmd virt-server
2. Make guest domain directory
# mkdir -p /tmp/trace-cmd/virt/<domain>
# chmod 710 /tmp/trace-cmd/virt/<domain>
# chgrp qemu /tmp/trace-cmd/virt/<domain>
3. Make FIFO on the host
# mkfifo /tmp/trace-cmd/virt/<domain>/trace-path-cpu{0,1,...,X}.{in,out}
4. Set up virtio-serial pipes of the guest on the host
Add the following tags to domain XML files.
# virsh edit <domain>
<channel type='unix'>
<source mode='connect' path='/tmp/trace-cmd/virt/agent-ctl-path'/>
<target type='virtio' name='agent-ctl-path'/>
</channel>
<channel type='pipe'>
<source path='/tmp/trace-cmd/virt/<domain>/trace-path-cpu0'/>
<target type='virtio' name='trace-path-cpu0'/>
</channel>
... (cpu1, cpu2, ...)
5. Boot the guest
# virsh start <domain>
6. Check I/F of virtio-serial on the guest
# ls /dev/virtio-ports
...
agent-ctl-path
...
trace-path-cpu0
...
Next, the user will run trace-cmd with record --virt options or other options
for virtualization on the guest.
This patch adds only minimum features of virt-server as follows:
<Features>
- virt-server subcommand
- Create I/F directory(/tmp/trace-cmd/virt/)
- Use named pipe I/Fs of virtio-serial for trace data paths
- Use UNIX domain socket for connecting clients on guests
- Use splice(2) for collecting trace data of guests
<Restrictions>
- libvirt is required for finding guest domain name
- User must setup fifos by hand
- Do not support hotplug VCPUs
- Interface directory is fixed
- SELinux should be disabled
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
Changes in V5: Change patch description
Update protocol document
Changes in V4: Fix some typos and cleanup
Changes in V3: Change _nw/_NW to _net/_NET
---
Documentation/Protocol.txt | 44 +++
Documentation/trace-cmd-virt-server.1.txt | 89 ++++++
trace-cmd.c | 3
trace-cmd.h | 2
trace-listen.c | 467 ++++++++++++++++++++++++-----
trace-msg.c | 105 ++++++-
trace-recorder.c | 50 ++-
trace-usage.c | 10 +
8 files changed, 667 insertions(+), 103 deletions(-)
create mode 100644 Documentation/trace-cmd-virt-server.1.txt
diff --git a/Documentation/Protocol.txt b/Documentation/Protocol.txt
index 49f7766..52df89e 100644
--- a/Documentation/Protocol.txt
+++ b/Documentation/Protocol.txt
@@ -6,6 +6,7 @@ Index
1. What is the trace-cmd protocol?
2. Trace-cmd Protocol V1 (Obsolete)
3. Trace-cmd Protocol V2
+4. Trace-cmd Protocol V2 in virt-server mode
1. What is the trace-cmd protocol?
@@ -117,3 +118,46 @@ or not by checking the first message from the client. If client
sends a positive number, it should be a V1 protocol client.
+4. Trace-cmd Protocol V2 in virt-server mode
+============================================
+
+In the virt-server mode, trace-cmd uses a control channel and
+trace data channels of virtio-serial to transfar trace data.
+
+Since the virtio-serial channel is just a character device
+on the guest, the server can not notice when a client attaches
+to (means opens) the channel. Thus, the server waits for the
+connection message MSG_TCONNECT from the client on the control
+channel. The protocol flow is as follows;
+
+ <server> <client>
+ Open a control channel
+ wait for MSG_TCONNECT
+ open a virtio-serial channel
+ send MSG_TCONNECT
+ receive MSG_TCONNECT <----+
+ send MSG_RCONNECT
+ +---------------> receive MSG_RCONNECT
+ check "tracecmd-V2"
+ send MSG_TINIT with cpus, pagesize and options
+ receive MSG_TINIT <-------+
+ perse the parameters
+ send MSG_RINIT with port_array
+ +----------------> receive MSG_RINIT
+ get port_array
+ send meta data(MSG_SENDMETA)
+ receive MSG_SENDMETA <----+
+ record meta data
+ (snip)
+ send a message to finish sending meta data
+ | (MSG_FINMETA)
+ receive MSG_FINMETA <-----+
+ read block
+ --- start sending trace data on child processes ---
+
+ --- When client finishes sending trace data ---
+ send MSG_CLOSE
+ receive MSG_CLOSE <-------+
+ close the virtio-serial channel
+
+
diff --git a/Documentation/trace-cmd-virt-server.1.txt b/Documentation/trace-cmd-virt-server.1.txt
new file mode 100644
index 0000000..b775745
--- /dev/null
+++ b/Documentation/trace-cmd-virt-server.1.txt
@@ -0,0 +1,89 @@
+TRACE-CMD-VIRT-SERVER(1)
+========================
+
+NAME
+----
+trace-cmd-virt-server - listen for incoming connection to record tracing of
+ guests' clients
+
+SYNOPSIS
+--------
+*trace-cmd virt-server ['OPTIONS']
+
+DESCRIPTION
+-----------
+The trace-cmd(1) virt-server sets up UNIX domain socket I/F for communicating
+with guests' clients that run 'trace-cmd-record(1)' with the *--virt* option.
+When a connection is made, and the guest's client sends data, it will create a
+file called 'trace.DOMAIN.dat'. Where DOMAIN is the name of the guest named
+by libvirt.
+
+OPTIONS
+-------
+*-D*::
+ This options causes trace-cmd listen to go into a daemon mode and run in
+ the background.
+
+*-d* 'dir'::
+ This option specifies a directory to write the data files into.
+
+*-o* 'filename'::
+ This option overrides the default 'trace' in the 'trace.DOMAIN.dat' that
+ is created when guest's client connects.
+
+*-l* 'filename'::
+ This option writes the output messages to a log file instead of standard output.
+
+SETTING
+-------
+Here, an example is written as follows:
+
+1. Run virt-server on a host
+ # trace-cmd virt-server
+
+2. Make guest domain directory
+ # mkdir -p /tmp/trace-cmd/virt/<DOMAIN>
+ # chmod 710 /tmp/trace-cmd/virt/<DOMAIN>
+ # chgrp qemu /tmp/trace-cmd/virt/<DOMAIN>
+
+3. Make FIFO on the host
+ # mkfifo /tmp/trace-cmd/virt/<DOMAIN>/trace-path-cpu{0,1,...,X}.{in,out}
+
+4. Set up of virtio-serial pipe of a guest on the host
+ Add the following tags to domain XML files.
+ # virsh edit <guest domain>
+ <channel type='unix'>
+ <source mode='connect' path='/tmp/trace-cmd/virt/agent-ctl-path'/>
+ <target type='virtio' name='agent-ctl-path'/>
+ </channel>
+ <channel type='pipe'>
+ <source path='/tmp/trace-cmd/virt/<DOMAIN>/trace-path-cpu0'/>
+ <target type='virtio' name='trace-path-cpu0'/>
+ </channel>
+ ... (cpu1, cpu2, ...)
+
+5. Boot the guest
+ # virsh start <DOMAIN>
+
+6. Run the guest's client(see trace-cmd-record(1) with the *--virt* option)
+ # trace-cmd record -e sched* --virt
+
+SEE ALSO
+--------
+trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(1),
+trace-cmd-stop(1), trace-cmd-extract(1), trace-cmd-reset(1),
+trace-cmd-split(1), trace-cmd-list(1)
+
+AUTHOR
+------
+Written by Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
+
+RESOURCES
+---------
+git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git
+
+COPYING
+-------
+Copyright \(C) 2013,2104 Hitachi, Ltd. Free use of this software is
+granted under the terms of the GNU Public License (GPL).
+
diff --git a/trace-cmd.c b/trace-cmd.c
index ebf9c7a..be7172e 100644
--- a/trace-cmd.c
+++ b/trace-cmd.c
@@ -420,7 +420,8 @@ int main (int argc, char **argv)
} else if (strcmp(argv[1], "mem") == 0) {
trace_mem(argc, argv);
exit(0);
- } else if (strcmp(argv[1], "listen") == 0) {
+ } else if (strcmp(argv[1], "listen") == 0 ||
+ strcmp(argv[1], "virt-server") == 0) {
trace_listen(argc, argv);
exit(0);
} else if (strcmp(argv[1], "split") == 0) {
diff --git a/trace-cmd.h b/trace-cmd.h
index f65f29e..c4e5beb 100644
--- a/trace-cmd.h
+++ b/trace-cmd.h
@@ -242,6 +242,7 @@ struct tracecmd_recorder *tracecmd_create_recorder_maxkb(const char *file, int c
struct tracecmd_recorder *tracecmd_create_buffer_recorder_fd(int fd, int cpu, unsigned flags, const char *buffer);
struct tracecmd_recorder *tracecmd_create_buffer_recorder(const char *file, int cpu, unsigned flags, const char *buffer);
struct tracecmd_recorder *tracecmd_create_buffer_recorder_maxkb(const char *file, int cpu, unsigned flags, const char *buffer, int maxkb);
+struct tracecmd_recorder *tracecmd_create_recorder_virt(const char *file, int cpu, int trace_fd);
int tracecmd_start_recording(struct tracecmd_recorder *recorder, unsigned long sleep);
void tracecmd_stop_recording(struct tracecmd_recorder *recorder);
@@ -255,6 +256,7 @@ int tracecmd_msg_finish_sending_metadata(int fd);
void tracecmd_msg_send_close_msg(void);
/* for server */
+int tracecmd_msg_set_connection(int fd, const char *domain);
int tracecmd_msg_initial_setting(int fd, int *cpus, int *pagesize);
int tracecmd_msg_send_port_array(int fd, int total_cpus, int *ports);
int tracecmd_msg_collect_metadata(int ifd, int ofd);
diff --git a/trace-listen.c b/trace-listen.c
index 17ab184..718680f 100644
--- a/trace-listen.c
+++ b/trace-listen.c
@@ -23,9 +23,13 @@
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
+#include <grp.h>
+#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
+#include <sys/epoll.h>
+#include <sys/un.h>
#include <netdb.h>
#include <unistd.h>
#include <fcntl.h>
@@ -50,19 +54,42 @@ static int backlog = 5;
static int proto_ver;
-#define TEMP_FILE_STR "%s.%s:%s.cpu%d", output_file, host, port, cpu
-static char *get_temp_file(const char *host, const char *port, int cpu)
+enum {
+ NET = 1,
+ VIRT = 2,
+};
+
+#define TEMP_FILE_STR_NET "%s.%s:%s.cpu%d", output_file, host, port, cpu
+#define TEMP_FILE_STR_VIRT "%s.%s:%d.cpu%d", output_file, domain, virtpid, cpu
+static char *get_temp_file(const char *host, const char *port,
+ const char *domain, int virtpid, int cpu, int mode)
{
char *file = NULL;
int size;
- size = snprintf(file, 0, TEMP_FILE_STR);
- file = malloc_or_die(size + 1);
- sprintf(file, TEMP_FILE_STR);
+ if (mode == NET) {
+ size = snprintf(file, 0, TEMP_FILE_STR_NET);
+ file = malloc_or_die(size + 1);
+ sprintf(file, TEMP_FILE_STR_NET);
+ } else if (mode == VIRT) {
+ size = snprintf(file, 0, TEMP_FILE_STR_VIRT);
+ file = malloc_or_die(size + 1);
+ sprintf(file, TEMP_FILE_STR_VIRT);
+ }
return file;
}
+static char *get_temp_file_net(const char *host, const char *port, int cpu)
+{
+ return get_temp_file(host, port, NULL, 0, cpu, NET);
+}
+
+static char *get_temp_file_virt(const char *domain, int virtpid, int cpu)
+{
+ return get_temp_file(NULL, NULL, domain, virtpid, cpu, VIRT);
+}
+
static void put_temp_file(char *file)
{
free(file);
@@ -81,11 +108,15 @@ static void signal_setup(int sig, sighandler_t handle)
sigaction(sig, &action, NULL);
}
-static void delete_temp_file(const char *host, const char *port, int cpu)
+static void delete_temp_file(const char *host, const char *port,
+ const char *domain, int virtpid, int cpu, int mode)
{
char file[MAX_PATH];
- snprintf(file, MAX_PATH, TEMP_FILE_STR);
+ if (mode == NET)
+ snprintf(file, MAX_PATH, TEMP_FILE_STR_NET);
+ else if (mode == VIRT)
+ snprintf(file, MAX_PATH, TEMP_FILE_STR_VIRT);
unlink(file);
}
@@ -113,8 +144,12 @@ static int process_option(char *option)
return 0;
}
+static struct tracecmd_recorder *recorder;
+
static void finish(int sig)
{
+ if (recorder)
+ tracecmd_stop_recording(recorder);
done = 1;
}
@@ -184,7 +219,7 @@ static void process_udp_child(int sfd, const char *host, const char *port,
signal_setup(SIGUSR1, finish);
- tempfile = get_temp_file(host, port, cpu);
+ tempfile = get_temp_file_net(host, port, cpu);
fd = open(tempfile, O_WRONLY | O_TRUNC | O_CREAT, 0644);
if (fd < 0)
pdie("creating %s", tempfile);
@@ -225,6 +260,28 @@ static void process_udp_child(int sfd, const char *host, const char *port,
exit(0);
}
+#define SLEEP_DEFAULT 1000
+
+static void process_virt_child(int fd, int cpu, int pagesize,
+ const char *domain, int virtpid)
+{
+ char *tempfile;
+
+ signal_setup(SIGUSR1, finish);
+ tempfile = get_temp_file_virt(domain, virtpid, cpu);
+
+ recorder = tracecmd_create_recorder_virt(tempfile, cpu, fd);
+
+ do {
+ if (tracecmd_start_recording(recorder, SLEEP_DEFAULT) < 0)
+ break;
+ } while (!done);
+
+ tracecmd_free_recorder(recorder);
+ put_temp_file(tempfile);
+ exit(0);
+}
+
#define START_PORT_SEARCH 1500
#define MAX_PORT_SEARCH 6000
@@ -272,20 +329,37 @@ static int udp_bind_a_port(int start_port, int *sfd)
return num_port;
}
-static void fork_udp_reader(int sfd, const char *node, const char *port,
- int *pid, int cpu, int pagesize)
+static void fork_reader(int sfd, const char *node, const char *port,
+ int *pid, int cpu, int pagesize, const char *domain,
+ int virtpid, int mode)
{
*pid = fork();
if (*pid < 0)
- pdie("creating udp reader");
+ pdie("creating reader");
- if (!*pid)
- process_udp_child(sfd, node, port, cpu, pagesize);
+ if (!*pid) {
+ if (mode == NET)
+ process_udp_child(sfd, node, port, cpu, pagesize);
+ else if (mode == VIRT)
+ process_virt_child(sfd, cpu, pagesize, domain, virtpid);
+ }
close(sfd);
}
+static void fork_udp_reader(int sfd, const char *node, const char *port,
+ int *pid, int cpu, int pagesize)
+{
+ fork_reader(sfd, node, port, pid, cpu, pagesize, NULL, 0, NET);
+}
+
+static void fork_virt_reader(int sfd, int *pid, int cpu, int pagesize,
+ const char *domain, int virtpid)
+{
+ fork_reader(sfd, NULL, NULL, pid, cpu, pagesize, domain, virtpid, VIRT);
+}
+
static int open_udp(const char *node, const char *port, int *pid,
int cpu, int pagesize, int start_port)
{
@@ -305,6 +379,29 @@ static int open_udp(const char *node, const char *port, int *pid,
return num_port;
}
+#define TRACE_CMD_DIR "/tmp/trace-cmd/"
+#define VIRT_DIR TRACE_CMD_DIR "virt/"
+#define VIRT_TRACE_CTL_SOCK VIRT_DIR "agent-ctl-path"
+#define TRACE_PATH_DOMAIN_CPU VIRT_DIR "%s/trace-path-cpu%d.out"
+
+static int open_virtio_serial_pipe(int *pid, int cpu, int pagesize,
+ const char *domain, int virtpid)
+{
+ char buf[PATH_MAX];
+ int fd;
+
+ snprintf(buf, PATH_MAX, TRACE_PATH_DOMAIN_CPU, domain, cpu);
+ fd = open(buf, O_RDONLY | O_NONBLOCK);
+ if (fd < 0) {
+ warning("open %s", buf);
+ return fd;
+ }
+
+ fork_virt_reader(fd, pid, cpu, pagesize, domain, virtpid);
+
+ return fd;
+}
+
/* Setup client who is using the v1 protocol */
static int client_initial_setting(int fd, char *buf, int *cpus, int *pagesize)
{
@@ -369,7 +466,7 @@ static int client_initial_setting(int fd, char *buf, int *cpus, int *pagesize)
return 0;
}
-static int communicate_with_client(int fd, int *cpus, int *pagesize)
+static int communicate_with_client_net(int fd, int *cpus, int *pagesize)
{
char buf[BUFSIZ];
int n;
@@ -407,12 +504,32 @@ static int communicate_with_client(int fd, int *cpus, int *pagesize)
return 0;
}
-static int create_client_file(const char *node, const char *port)
+static int communicate_with_client_virt(int fd, const char *domain, int *cpus, int *pagesize)
+{
+ proto_ver = V2_PROTOCOL;
+
+ if (tracecmd_msg_set_connection(fd, domain) < 0)
+ return -1;
+
+ /* read the CPU count, the page size, and options */
+ if (tracecmd_msg_initial_setting(fd, cpus, pagesize) < 0)
+ return -1;
+
+ return 0;
+}
+
+static int create_client_file(const char *node, const char *port,
+ const char *domain, int pid, int mode)
{
char buf[BUFSIZ];
int ofd;
- snprintf(buf, BUFSIZ, "%s.%s:%s.dat", output_file, node, port);
+ if (mode == NET)
+ snprintf(buf, BUFSIZ, "%s.%s:%s.dat", output_file, node, port);
+ else if (mode == VIRT)
+ snprintf(buf, BUFSIZ, "%s.%s:%d.dat", output_file, domain, pid);
+ else
+ plog("create_client_file: Unsupported mode %d", mode);
ofd = open(buf, O_RDWR | O_CREAT | O_TRUNC, 0644);
if (ofd < 0)
@@ -421,7 +538,8 @@ static int create_client_file(const char *node, const char *port)
}
static void destroy_all_readers(int cpus, int *pid_array, const char *node,
- const char *port)
+ const char *port, const char *domain,
+ int virtpid, int mode)
{
int cpu;
@@ -429,42 +547,50 @@ static void destroy_all_readers(int cpus, int *pid_array, const char *node,
if (pid_array[cpu] > 0) {
kill(pid_array[cpu], SIGKILL);
waitpid(pid_array[cpu], NULL, 0);
- delete_temp_file(node, port, cpu);
+ delete_temp_file(node, port, domain, virtpid, cpu, mode);
pid_array[cpu] = 0;
}
}
}
static int *create_all_readers(int cpus, const char *node, const char *port,
- int pagesize, int fd)
+ const char *domain, int virtpid, int pagesize,
+ int fd, int mode)
{
char buf[BUFSIZ];
- int *port_array;
+ int *port_array = NULL;
int *pid_array;
int start_port;
int udp_port;
int cpu;
int pid;
- port_array = malloc_or_die(sizeof(int) * cpus);
+ if (mode == NET) {
+ port_array = malloc_or_die(sizeof(int) * cpus);
+ start_port = START_PORT_SEARCH;
+ }
pid_array = malloc_or_die(sizeof(int) * cpus);
memset(pid_array, 0, sizeof(int) * cpus);
- start_port = START_PORT_SEARCH;
-
- /* Now create a UDP port for each CPU */
+ /* Now create a reader for each CPU */
for (cpu = 0; cpu < cpus; cpu++) {
- udp_port = open_udp(node, port, &pid, cpu,
- pagesize, start_port);
- if (udp_port < 0)
- goto out_free;
- port_array[cpu] = udp_port;
+ if (node) {
+ udp_port = open_udp(node, port, &pid, cpu,
+ pagesize, start_port);
+ if (udp_port < 0)
+ goto out_free;
+ port_array[cpu] = udp_port;
+ /*
+ * Due to some bugging finding ports,
+ * force search after last port
+ */
+ start_port = udp_port + 1;
+ } else {
+ if (open_virtio_serial_pipe(&pid, cpu, pagesize,
+ domain, virtpid) < 0)
+ goto out_free;
+ }
pid_array[cpu] = pid;
- /*
- * Due to some bugging finding ports,
- * force search after last port
- */
- start_port = udp_port + 1;
}
if (proto_ver == V2_PROTOCOL) {
@@ -485,7 +611,7 @@ static int *create_all_readers(int cpus, const char *node, const char *port,
return pid_array;
out_free:
- destroy_all_readers(cpus, pid_array, node, port);
+ destroy_all_readers(cpus, pid_array, node, port, domain, virtpid, mode);
return NULL;
}
@@ -527,7 +653,8 @@ static void stop_all_readers(int cpus, int *pid_array)
}
static void put_together_file(int cpus, int ofd, const char *node,
- const char *port)
+ const char *port, const char *domain, int virtpid,
+ int mode)
{
char **temp_files;
int cpu;
@@ -536,25 +663,33 @@ static void put_together_file(int cpus, int ofd, const char *node,
temp_files = malloc_or_die(sizeof(*temp_files) * cpus);
for (cpu = 0; cpu < cpus; cpu++)
- temp_files[cpu] = get_temp_file(node, port, cpu);
+ temp_files[cpu] = get_temp_file(node, port, domain,
+ virtpid, cpu, mode);
tracecmd_attach_cpu_data_fd(ofd, cpus, temp_files);
free(temp_files);
}
-static void process_client(const char *node, const char *port, int fd)
+static void process_client(int fd, const char *node, const char *port,
+ const char *domain, int virtpid, int mode)
{
int *pid_array;
int pagesize;
int cpus;
int ofd;
- if (communicate_with_client(fd, &cpus, &pagesize) < 0)
- return;
-
- ofd = create_client_file(node, port);
-
- pid_array = create_all_readers(cpus, node, port, pagesize, fd);
+ if (mode == NET) {
+ if (communicate_with_client_net(fd, &cpus, &pagesize) < 0)
+ return;
+ } else if (mode == VIRT) {
+ if (communicate_with_client_virt(fd, domain, &cpus, &pagesize) < 0)
+ return;
+ } else
+ pdie("process_client: Unsupported mode %d", mode);
+
+ ofd = create_client_file(node, port, domain, virtpid, mode);
+ pid_array = create_all_readers(cpus, node, port, domain, virtpid,
+ pagesize, fd, mode);
if (!pid_array)
return;
@@ -573,9 +708,22 @@ static void process_client(const char *node, const char *port, int fd)
/* wait a little to have the readers clean up */
sleep(1);
- put_together_file(cpus, ofd, node, port);
+ put_together_file(cpus, ofd, node, port, domain, virtpid, mode);
+
+ destroy_all_readers(cpus, pid_array, node, port, domain, virtpid, mode);
+}
+
+static void process_client_net(int fd, const char *node, const char *port)
+{
+ process_client(fd, node, port, NULL, 0, NET);
+}
- destroy_all_readers(cpus, pid_array, node, port);
+static void process_client_virt(int fd, const char *domain, int virtpid)
+{
+ /* keep connection to qemu if clients on guests finish operation */
+ do {
+ process_client(fd, NULL, NULL, domain, virtpid, VIRT);
+ } while (!done);
}
static int do_fork(int cfd)
@@ -602,32 +750,104 @@ static int do_fork(int cfd)
return 0;
}
-static int do_connection(int cfd, struct sockaddr_storage *peer_addr,
- socklen_t peer_addr_len)
+static int get_virtpid(int cfd)
{
- char host[NI_MAXHOST], service[NI_MAXSERV];
- int s;
+ struct ucred cr;
+ socklen_t cl;
int ret;
- ret = do_fork(cfd);
- if (ret)
+ cl = sizeof(cr);
+ ret = getsockopt(cfd, SOL_SOCKET, SO_PEERCRED, &cr, &cl);
+ if (ret < 0)
return ret;
- s = getnameinfo((struct sockaddr *)peer_addr, peer_addr_len,
- host, NI_MAXHOST,
- service, NI_MAXSERV, NI_NUMERICSERV);
+ return cr.pid;
+}
- if (s == 0)
- plog("Connected with %s:%s\n",
- host, service);
- else {
- plog("Error with getnameinfo: %s\n",
- gai_strerror(s));
- close(cfd);
- return -1;
+#define LIBVIRT_DOMAIN_PATH "/var/run/libvirt/qemu/"
+
+/* We can convert pid to domain name of a guest when we use libvirt. */
+static char *get_guest_domain_from_pid(int pid)
+{
+ struct dirent *dirent;
+ char file_name[NAME_MAX];
+ char *file_name_ret, *domain;
+ char buf[BUFSIZ];
+ DIR *dir;
+ size_t doml;
+ int fd;
+
+ dir = opendir(LIBVIRT_DOMAIN_PATH);
+ if (!dir) {
+ if (errno == ENOENT)
+ warning("Only support for using libvirt");
+ return NULL;
+ }
+
+ for (dirent = readdir(dir); dirent != NULL; dirent = readdir(dir)) {
+ snprintf(file_name, NAME_MAX, LIBVIRT_DOMAIN_PATH"%s",
+ dirent->d_name);
+ file_name_ret = strstr(file_name, ".pid");
+ if (file_name_ret) {
+ fd = open(file_name, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+ if (read(fd, buf, BUFSIZ) < 0)
+ return NULL;
+
+ if (pid == atoi(buf)) {
+ /* not include /var/run/libvirt/qemu */
+ doml = (size_t)(file_name_ret - file_name)
+ - strlen(LIBVIRT_DOMAIN_PATH);
+ domain = strndup(file_name +
+ strlen(LIBVIRT_DOMAIN_PATH),
+ doml);
+ plog("start %s:%d\n", domain, pid);
+ return domain;
+ }
+ }
}
- process_client(host, service, cfd);
+ return NULL;
+}
+
+static int do_connection(int cfd, struct sockaddr *peer_addr,
+ socklen_t peer_addr_len, int mode)
+{
+ char host[NI_MAXHOST], service[NI_MAXSERV];
+ int s, ret, virtpid;
+ char *domain = NULL;
+
+ if (mode == VIRT) {
+ virtpid = get_virtpid(cfd);
+ if (virtpid < 0)
+ return virtpid;
+
+ domain = get_guest_domain_from_pid(virtpid);
+ if (!domain)
+ return -1;
+ }
+
+ ret = do_fork(cfd);
+ if (ret)
+ return ret;
+
+ if (mode == NET) {
+ s = getnameinfo(peer_addr, peer_addr_len, host, NI_MAXHOST,
+ service, NI_MAXSERV, NI_NUMERICSERV);
+
+ if (s == 0)
+ plog("Connected with %s:%s\n",
+ host, service);
+ else {
+ plog("Error with getnameinfo: %s\n",
+ gai_strerror(s));
+ close(cfd);
+ return -1;
+ }
+ process_client_net(cfd, host, service);
+ } else if (mode == VIRT)
+ process_client_virt(cfd, domain, virtpid);
close(cfd);
@@ -681,12 +901,11 @@ static void remove_process(int pid)
static void kill_clients(void)
{
- int status;
int i;
for (i = 0; i < saved_pids; i++) {
kill(client_pids[i], SIGINT);
- waitpid(client_pids[i], &status, 0);
+ waitpid(client_pids[i], NULL, 0);
}
saved_pids = 0;
@@ -705,31 +924,38 @@ static void clean_up(int sig)
} while (ret > 0);
}
-static void do_accept_loop(int sfd)
+static void do_accept_loop(int sfd, int mode)
{
- struct sockaddr_storage peer_addr;
- socklen_t peer_addr_len;
+ struct sockaddr addr;
+ socklen_t addrlen;
int cfd, pid;
- peer_addr_len = sizeof(peer_addr);
+ if (mode == NET)
+ addrlen = sizeof(struct sockaddr_storage);
+ else if (mode == VIRT)
+ addrlen = sizeof(struct sockaddr_un);
+ else
+ pdie("do_accept_loop: Unsupported mode %d", mode);
do {
- cfd = accept(sfd, (struct sockaddr *)&peer_addr,
- &peer_addr_len);
+ cfd = accept(sfd, &addr, &addrlen);
printf("connected!\n");
if (cfd < 0 && errno == EINTR)
continue;
if (cfd < 0)
pdie("connecting");
- pid = do_connection(cfd, &peer_addr, peer_addr_len);
+ if (mode == NET)
+ pid = do_connection(cfd, &addr, addrlen, mode);
+ else if (mode == VIRT)
+ pid = do_connection(cfd, NULL, 0, mode);
if (pid > 0)
add_process(pid);
} while (!done);
}
-static void do_listen(char *port)
+static void do_listen_net(char *port)
{
struct addrinfo hints;
struct addrinfo *result, *rp;
@@ -767,8 +993,64 @@ static void do_listen(char *port)
if (listen(sfd, backlog) < 0)
pdie("listen");
- do_accept_loop(sfd);
+ do_accept_loop(sfd, NET);
+
+ kill_clients();
+}
+
+static void make_virt_if_dir(void)
+{
+ struct group *group;
+
+ if (mkdir(TRACE_CMD_DIR, 0710) < 0) {
+ if (errno != EEXIST)
+ pdie("mkdir %s", TRACE_CMD_DIR);
+ }
+ /* QEMU operates as qemu:qemu */
+ chmod(TRACE_CMD_DIR, 0710);
+ group = getgrnam("qemu");
+ if (chown(TRACE_CMD_DIR, -1, group->gr_gid) < 0)
+ pdie("chown %s", TRACE_CMD_DIR);
+
+ if (mkdir(VIRT_DIR, 0710) < 0) {
+ if (errno != EEXIST)
+ pdie("mkdir %s", VIRT_DIR);
+ }
+ chmod(VIRT_DIR, 0710);
+ if (chown(VIRT_DIR, -1, group->gr_gid) < 0)
+ pdie("chown %s", VIRT_DIR);
+}
+
+static void do_listen_virt(void)
+{
+ struct sockaddr_un un_server;
+ struct group *group;
+ socklen_t slen;
+ int sfd;
+
+ make_virt_if_dir();
+
+ slen = sizeof(un_server);
+ sfd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (sfd < 0)
+ pdie("socket");
+
+ un_server.sun_family = AF_UNIX;
+ snprintf(un_server.sun_path, PATH_MAX, VIRT_TRACE_CTL_SOCK);
+
+ if (bind(sfd, (struct sockaddr *)&un_server, slen) < 0)
+ pdie("bind");
+ chmod(VIRT_TRACE_CTL_SOCK, 0660);
+ group = getgrnam("qemu");
+ if (chown(VIRT_TRACE_CTL_SOCK, -1, group->gr_gid) < 0)
+ pdie("fchown %s", VIRT_TRACE_CTL_SOCK);
+
+ if (listen(sfd, backlog) < 0)
+ pdie("listen");
+
+ do_accept_loop(sfd, VIRT);
+ unlink(VIRT_TRACE_CTL_SOCK);
kill_clients();
}
@@ -782,17 +1064,33 @@ enum {
OPT_debug = 255,
};
+static void parse_args_net(int c, char **argv, char **port)
+{
+ switch (c) {
+ case 'p':
+ *port = optarg;
+ break;
+ default:
+ usage(argv);
+ }
+}
+
void trace_listen(int argc, char **argv)
{
char *logfile = NULL;
char *port = NULL;
int daemon = 0;
+ int mode = 0;
int c;
if (argc < 2)
usage(argv);
- if (strcmp(argv[1], "listen") != 0)
+ if (strcmp(argv[1], "listen") == 0)
+ mode = NET;
+ else if (strcmp(argv[1], "virt-server") == 0)
+ mode = VIRT;
+ else
usage(argv);
for (;;) {
@@ -812,9 +1110,6 @@ void trace_listen(int argc, char **argv)
case 'h':
usage(argv);
break;
- case 'p':
- port = optarg;
- break;
case 'd':
output_dir = optarg;
break;
@@ -831,11 +1126,14 @@ void trace_listen(int argc, char **argv)
debug = 1;
break;
default:
- usage(argv);
+ if (mode == NET)
+ parse_args_net(c, argv, &port);
+ else
+ usage(argv);
}
}
- if (!port)
+ if (!port && mode == NET)
usage(argv);
if ((argc - optind) >= 2)
@@ -863,7 +1161,12 @@ void trace_listen(int argc, char **argv)
signal_setup(SIGINT, finish);
signal_setup(SIGTERM, finish);
- do_listen(port);
+ if (mode == NET)
+ do_listen_net(port);
+ else if (mode == VIRT)
+ do_listen_virt();
+ else
+ ; /* Not reached */
return;
}
diff --git a/trace-msg.c b/trace-msg.c
index 3228559..c9dcac5 100644
--- a/trace-msg.c
+++ b/trace-msg.c
@@ -59,6 +59,9 @@ typedef __be32 be32;
#define CPU_MAX 256
+/* use CONNECT_MSG as a protocol version of trace-msg */
+#define CONNECT_MSG "tracecmd-V2"
+
/* for both client and server */
bool use_tcp;
int cpu_count;
@@ -78,6 +81,10 @@ struct tracecmd_msg_str {
char *buf;
} __attribute__((packed));
+struct tracecmd_msg_rconnect {
+ struct tracecmd_msg_str str;
+};
+
struct tracecmd_msg_opt {
be32 size;
be32 opt_cmd;
@@ -104,6 +111,7 @@ struct tracecmd_msg_error {
be32 size;
be32 cmd;
union {
+ struct tracecmd_msg_rconnect rconnect;
struct tracecmd_msg_tinit tinit;
struct tracecmd_msg_rinit rinit;
struct tracecmd_msg_meta meta;
@@ -111,7 +119,10 @@ struct tracecmd_msg_error {
} __attribute__((packed));
enum tracecmd_msg_cmd {
+ MSG_ERROR = 0,
MSG_CLOSE = 1,
+ MSG_TCONNECT = 2,
+ MSG_RCONNECT = 3,
MSG_TINIT = 4,
MSG_RINIT = 5,
MSG_SENDMETA = 6,
@@ -122,6 +133,7 @@ struct tracecmd_msg {
be32 size;
be32 cmd;
union {
+ struct tracecmd_msg_rconnect rconnect;
struct tracecmd_msg_tinit tinit;
struct tracecmd_msg_rinit rinit;
struct tracecmd_msg_meta meta;
@@ -159,6 +171,16 @@ static void bufcpy(void *dest, u32 offset, const void *buf, u32 buflen)
memcpy(dest+offset, buf, buflen);
}
+static int make_rconnect(const char *buf, int buflen, struct tracecmd_msg *msg)
+{
+ u32 offset = offsetof(struct tracecmd_msg, data.rconnect.str.buf);
+
+ msg->data.rconnect.str.size = htonl(buflen);
+ bufcpy(msg, offset, buf, buflen);
+
+ return 0;
+}
+
enum msg_opt_command {
MSGOPT_USETCP = 1,
};
@@ -236,11 +258,13 @@ static int make_rinit(struct tracecmd_msg *msg)
msg->data.rinit.cpus = htonl(cpu_count);
- for (i = 0; i < cpu_count; i++) {
- /* + rrqports->cpus or rrqports->port_array[i] */
- offset += sizeof(be32);
- port = htonl(port_array[i]);
- bufcpy(msg, offset, &port, sizeof(be32) * cpu_count);
+ if (port_array) {
+ for (i = 0; i < cpu_count; i++) {
+ /* + rrqports->cpus or rrqports->port_array[i] */
+ offset += sizeof(be32);
+ port = htonl(port_array[i]);
+ bufcpy(msg, offset, &port, sizeof(be32) * cpu_count);
+ }
}
return 0;
@@ -252,6 +276,9 @@ static u32 tracecmd_msg_get_body_length(u32 cmd)
u32 len = 0;
switch (cmd) {
+ case MSG_RCONNECT:
+ return sizeof(msg->data.rconnect.str.size)
+ + sizeof(CONNECT_MSG);
case MSG_TINIT:
len = sizeof(msg->data.tinit.cpus)
+ sizeof(msg->data.tinit.page_size)
@@ -288,6 +315,8 @@ static u32 tracecmd_msg_get_body_length(u32 cmd)
static int tracecmd_msg_make_body(u32 cmd, struct tracecmd_msg *msg)
{
switch (cmd) {
+ case MSG_RCONNECT:
+ return make_rconnect(CONNECT_MSG, sizeof(CONNECT_MSG), msg);
case MSG_TINIT:
return make_tinit(msg);
case MSG_RINIT:
@@ -423,6 +452,8 @@ static void *tracecmd_msg_buf_access(struct tracecmd_msg *msg, int offset)
static int tracecmd_msg_wait_for_msg(int fd, struct tracecmd_msg *msg)
{
+ int offset = TRACECMD_MSG_HDR_LEN;
+ char *buf;
u32 cmd;
int ret;
@@ -434,8 +465,20 @@ static int tracecmd_msg_wait_for_msg(int fd, struct tracecmd_msg *msg)
}
cmd = ntohl(msg->cmd);
- if (cmd == MSG_CLOSE)
+ switch (cmd) {
+ case MSG_RCONNECT:
+ offset += sizeof(msg->data.rconnect.str.size);
+ buf = tracecmd_msg_buf_access(msg, offset);
+ /* Make sure the server is the tracecmd server */
+ if (memcmp(buf, CONNECT_MSG,
+ ntohl(msg->data.rconnect.str.size) - 1) != 0) {
+ warning("server not tracecmd server");
+ return -EPROTONOSUPPORT;
+ }
+ break;
+ case MSG_CLOSE:
return -ECONNABORTED;
+ }
return 0;
}
@@ -494,7 +537,55 @@ static void error_operation_for_server(struct tracecmd_msg *msg)
cmd = ntohl(msg->cmd);
- warning("Message: cmd=%d size=%d\n", cmd, ntohl(msg->size));
+ if (cmd == MSG_ERROR)
+ plog("Receive error message: cmd=%d size=%d\n",
+ ntohl(msg->data.err.cmd), ntohl(msg->data.err.size));
+ else
+ warning("Message: cmd=%d size=%d\n", cmd, ntohl(msg->size));
+}
+
+int tracecmd_msg_set_connection(int fd, const char *domain)
+{
+ struct tracecmd_msg *msg;
+ char buf[TRACECMD_MSG_MAX_LEN] = {};
+ u32 cmd;
+ int ret;
+
+ msg = (struct tracecmd_msg *)buf;
+
+ /*
+ * Wait for connection msg by a client first.
+ * If a client uses virtio-serial, a connection message will
+ * not be sent immediately after accept(). connect() is called
+ * in QEMU, so the client can send the connection message
+ * after guest boots. Therefore, the virt-server patiently
+ * waits for the connection request of a client.
+ */
+ ret = tracecmd_msg_recv(fd, msg);
+ if (ret < 0) {
+ if (!buf[0]) {
+ /* No data means QEMU has already died. */
+ close(fd);
+ die("Connection refuesd: %s", domain);
+ }
+ return -ENOMSG;
+ }
+
+ cmd = ntohl(msg->cmd);
+ if (cmd == MSG_CLOSE)
+ return -ECONNABORTED;
+ else if (cmd != MSG_TCONNECT)
+ return -EINVAL;
+
+ ret = tracecmd_msg_send(fd, MSG_RCONNECT);
+ if (ret < 0)
+ goto error;
+
+ return 0;
+
+error:
+ error_operation_for_server(msg);
+ return ret;
}
#define MAX_OPTION_SIZE 4096
diff --git a/trace-recorder.c b/trace-recorder.c
index 247bb2d..6670b6a 100644
--- a/trace-recorder.c
+++ b/trace-recorder.c
@@ -149,19 +149,23 @@ tracecmd_create_buffer_recorder_fd2(int fd, int fd2, int cpu, unsigned flags,
recorder->fd1 = fd;
recorder->fd2 = fd2;
- path = malloc_or_die(strlen(buffer) + 40);
- if (!path)
- goto out_free;
+ if (buffer) {
+ path = malloc_or_die(strlen(buffer) + 40);
+ if (!path)
+ goto out_free;
- if (flags & TRACECMD_RECORD_SNAPSHOT)
- sprintf(path, "%s/per_cpu/cpu%d/snapshot_raw", buffer, cpu);
- else
- sprintf(path, "%s/per_cpu/cpu%d/trace_pipe_raw", buffer, cpu);
- recorder->trace_fd = open(path, O_RDONLY);
- if (recorder->trace_fd < 0)
- goto out_free;
+ if (flags & TRACECMD_RECORD_SNAPSHOT)
+ sprintf(path, "%s/per_cpu/cpu%d/snapshot_raw",
+ buffer, cpu);
+ else
+ sprintf(path, "%s/per_cpu/cpu%d/trace_pipe_raw",
+ buffer, cpu);
+ recorder->trace_fd = open(path, O_RDONLY);
+ if (recorder->trace_fd < 0)
+ goto out_free;
- free(path);
+ free(path);
+ }
if ((recorder->flags & TRACECMD_RECORD_NOSPLICE) == 0) {
ret = pipe(recorder->brass);
@@ -184,8 +188,9 @@ tracecmd_create_buffer_recorder_fd(int fd, int cpu, unsigned flags, const char *
return tracecmd_create_buffer_recorder_fd2(fd, -1, cpu, flags, buffer, 0);
}
-struct tracecmd_recorder *
-tracecmd_create_buffer_recorder(const char *file, int cpu, unsigned flags, const char *buffer)
+static struct tracecmd_recorder *
+__tracecmd_create_buffer_recorder(const char *file, int cpu, unsigned flags,
+ const char *buffer)
{
struct tracecmd_recorder *recorder;
int fd;
@@ -248,6 +253,25 @@ tracecmd_create_buffer_recorder_maxkb(const char *file, int cpu, unsigned flags,
goto out;
}
+struct tracecmd_recorder *
+tracecmd_create_buffer_recorder(const char *file, int cpu, unsigned flags,
+ const char *buffer)
+{
+ return __tracecmd_create_buffer_recorder(file, cpu, flags, buffer);
+}
+
+struct tracecmd_recorder *
+tracecmd_create_recorder_virt(const char *file, int cpu, int trace_fd)
+{
+ struct tracecmd_recorder *recorder;
+
+ recorder = __tracecmd_create_buffer_recorder(file, cpu, 0, NULL);
+ if (recorder)
+ recorder->trace_fd = trace_fd;
+
+ return recorder;
+}
+
struct tracecmd_recorder *tracecmd_create_recorder_fd(int fd, int cpu, unsigned flags)
{
char *tracing;
diff --git a/trace-usage.c b/trace-usage.c
index 0dec87e..0411cb4 100644
--- a/trace-usage.c
+++ b/trace-usage.c
@@ -183,6 +183,16 @@ static struct usage_help usage_help[] = {
" -l logfile to write messages to.\n"
},
{
+ "virt-server",
+ "listen on a virtio-serial for trace clients",
+ " %s virt-server [-o file][-d dir][-l logfile]\n"
+ " Creates a socket to listen for clients.\n"
+ " -D create it in daemon mode.\n"
+ " -o file name to use for clients.\n"
+ " -d diretory to store client files.\n"
+ " -l logfile to write messages to.\n"
+ },
+ {
"list",
"list the available events, plugins or options",
" %s list [-e [regex]][-t][-o][-f [regex]]\n"
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH trace-cmd V5 5/6] trace-cmd/record: Add --virt option for record mode
2014-12-22 17:47 [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache Masami Hiramatsu
` (4 preceding siblings ...)
2014-12-22 17:48 ` [PATCH trace-cmd V5 4/6] trace-cmd/virt-server: Add virt-server mode for a virtualization environment Masami Hiramatsu
@ 2014-12-22 17:48 ` Masami Hiramatsu
2014-12-22 17:48 ` [PATCH trace-cmd V5 6/6] trace-cmd/virt-server: Add --dom option which makes a domain directory to virt-server Masami Hiramatsu
2015-05-19 21:06 ` [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache Steven Rostedt
7 siblings, 0 replies; 14+ messages in thread
From: Masami Hiramatsu @ 2014-12-22 17:48 UTC (permalink / raw)
To: Steven Rostedt
Cc: Hidehiro Kawai, yrl.pp-manager.tt, Aaron Fabbri, linux-kernel,
Divya Vyas
Add --virt option for record mode for a virtualization environment.
If we use this option on a guest, we can send trace data in low-overhead.
This is because guests can send trace data to a host without copying the data
by using splice(2).
The format is:
trace-cmd record --virt -e sched*
<Note>
The client using virtio-serial does not wait for the connection message
"tracecmd" from the server. The client sends the connection message
MSG_TCONNECT first.
<Restriction>
This feature can use from kernel-3.6 which supports splice_read for ftrace
and splice_write for virtio-serial.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
Changes in V4: Rebase for current trace-cmd-v2.4
Add usage of --virt for record in trace-usage.c
Divide tracecmd_msg_connect_to_server() into two functions
(tracecmd_msg_connect_to_server() and
tracecmd_msg_send_init_data_virt(fd))
Changes in V3: Change _nw/_NW to _net/_NET
---
Documentation/trace-cmd-record.1.txt | 11 ++++-
trace-cmd.h | 4 +-
trace-msg.c | 79 +++++++++++++++++++++++++++++++---
trace-msg.h | 4 ++
trace-record.c | 71 ++++++++++++++++++++++++++++---
trace-usage.c | 3 +
6 files changed, 158 insertions(+), 14 deletions(-)
diff --git a/Documentation/trace-cmd-record.1.txt b/Documentation/trace-cmd-record.1.txt
index 9e63eb4..c0de074 100644
--- a/Documentation/trace-cmd-record.1.txt
+++ b/Documentation/trace-cmd-record.1.txt
@@ -258,6 +258,15 @@ OPTIONS
timestamp to gettimeofday which will allow wall time output from the
timestamps reading the created 'trace.dat' file.
+*--virt*::
+ This option is usded on a guest in a virtualization environment. If a host
+ is running "trace-cmd virt-server", this option is used to have the data
+ sent to the host with virtio-serial like *-N* option. (see also
+ trace-cmd-virt-server(1))
+
+ Note: This option is not supported with latency tracer plugins:
+ wakeup, wakeup_rt, irqsoff, preemptoff and preemptirqsoff
+
EXAMPLES
--------
@@ -320,7 +329,7 @@ SEE ALSO
--------
trace-cmd(1), trace-cmd-report(1), trace-cmd-start(1), trace-cmd-stop(1),
trace-cmd-extract(1), trace-cmd-reset(1), trace-cmd-split(1),
-trace-cmd-list(1), trace-cmd-listen(1)
+trace-cmd-list(1), trace-cmd-listen(1), trace-cmd-virt-server(1)
AUTHOR
------
diff --git a/trace-cmd.h b/trace-cmd.h
index c4e5beb..1c1b0c3 100644
--- a/trace-cmd.h
+++ b/trace-cmd.h
@@ -250,7 +250,9 @@ void tracecmd_stat_cpu(struct trace_seq *s, int cpu);
long tracecmd_flush_recording(struct tracecmd_recorder *recorder);
/* for clients */
-int tracecmd_msg_send_init_data(int fd);
+int tracecmd_msg_connect_to_server(int fd);
+int tracecmd_msg_send_init_data_net(int fd);
+int tracecmd_msg_send_init_data_virt(int fd);
int tracecmd_msg_metadata_send(int fd, char *buf, int size);
int tracecmd_msg_finish_sending_metadata(int fd);
void tracecmd_msg_send_close_msg(void);
diff --git a/trace-msg.c b/trace-msg.c
index c9dcac5..e3b2653 100644
--- a/trace-msg.c
+++ b/trace-msg.c
@@ -30,6 +30,7 @@
#include <stdio.h>
#include <unistd.h>
#include <arpa/inet.h>
+#include <sys/stat.h>
#include <sys/types.h>
#include <linux/types.h>
@@ -70,6 +71,7 @@ int cpu_count;
static int psfd;
unsigned int page_size;
int *client_ports;
+int *virt_sfds;
bool send_metadata;
/* for server */
@@ -270,12 +272,20 @@ static int make_rinit(struct tracecmd_msg *msg)
return 0;
}
+static int make_error_msg(u32 len, struct tracecmd_msg *msg)
+{
+ bufcpy(msg, TRACECMD_MSG_HDR_LEN, errmsg, len);
+ return 0;
+}
+
static u32 tracecmd_msg_get_body_length(u32 cmd)
{
struct tracecmd_msg *msg;
u32 len = 0;
switch (cmd) {
+ case MSG_ERROR:
+ return ntohl(errmsg->size);
case MSG_RCONNECT:
return sizeof(msg->data.rconnect.str.size)
+ sizeof(CONNECT_MSG);
@@ -304,6 +314,7 @@ static u32 tracecmd_msg_get_body_length(u32 cmd)
+ sizeof(msg->data.rinit.port_array);
case MSG_SENDMETA:
return TRACECMD_MSG_MAX_LEN - TRACECMD_MSG_HDR_LEN;
+ case MSG_TCONNECT:
case MSG_CLOSE:
case MSG_FINMETA:
break;
@@ -312,15 +323,18 @@ static u32 tracecmd_msg_get_body_length(u32 cmd)
return 0;
}
-static int tracecmd_msg_make_body(u32 cmd, struct tracecmd_msg *msg)
+static int tracecmd_msg_make_body(u32 cmd, u32 len, struct tracecmd_msg *msg)
{
switch (cmd) {
+ case MSG_ERROR:
+ return make_error_msg(len, msg);
case MSG_RCONNECT:
return make_rconnect(CONNECT_MSG, sizeof(CONNECT_MSG), msg);
case MSG_TINIT:
return make_tinit(msg);
case MSG_RINIT:
return make_rinit(msg);
+ case MSG_TCONNECT:
case MSG_CLOSE:
case MSG_SENDMETA: /* meta data is not stored here. */
case MSG_FINMETA:
@@ -345,7 +359,7 @@ static int tracecmd_msg_create(u32 cmd, struct tracecmd_msg **msg)
if (ret < 0)
return ret;
- ret = tracecmd_msg_make_body(cmd, *msg);
+ ret = tracecmd_msg_make_body(cmd, len, *msg);
if (ret < 0)
free(*msg);
@@ -374,6 +388,12 @@ static int tracecmd_msg_send(int fd, u32 cmd)
return ret;
}
+static void tracecmd_msg_send_error(int fd, struct tracecmd_msg *msg)
+{
+ errmsg = msg;
+ tracecmd_msg_send(fd, MSG_ERROR);
+}
+
static int tracecmd_msg_read_extra(int fd, void *buf, u32 size, int *n)
{
int r = 0;
@@ -498,9 +518,10 @@ static int tracecmd_msg_send_and_wait_for_msg(int fd, u32 cmd, struct tracecmd_m
return 0;
}
-int tracecmd_msg_send_init_data(int fd)
+static int tracecmd_msg_send_init_data(int fd, bool net)
{
char buf[TRACECMD_MSG_MAX_LEN];
+ char path[PATH_MAX];
struct tracecmd_msg *msg;
int i, cpus;
int ret;
@@ -511,9 +532,24 @@ int tracecmd_msg_send_init_data(int fd)
return ret;
cpus = ntohl(msg->data.rinit.cpus);
- client_ports = malloc_or_die(sizeof(int) * cpus);
- for (i = 0; i < cpus; i++)
- client_ports[i] = ntohl(msg->data.rinit.port_array[i]);
+ if (net) {
+ client_ports = malloc_or_die(sizeof(int) * cpus);
+ for (i = 0; i < cpus; i++)
+ client_ports[i] =
+ ntohl(msg->data.rinit.port_array[i]);
+ } else {
+ virt_sfds = malloc_or_die(sizeof(int) * cpus);
+
+ /* Open data paths of virtio-serial */
+ for (i = 0; i < cpus; i++) {
+ snprintf(path, PATH_MAX, TRACE_PATH_CPU, i);
+ virt_sfds[i] = open(path, O_WRONLY);
+ if (virt_sfds[i] < 0) {
+ warning("Cannot open %s", TRACE_PATH_CPU, i);
+ return -errno;
+ }
+ }
+ }
/* Next, send meta data */
send_metadata = true;
@@ -521,6 +557,37 @@ int tracecmd_msg_send_init_data(int fd)
return 0;
}
+int tracecmd_msg_send_init_data_net(int fd)
+{
+ return tracecmd_msg_send_init_data(fd, true);
+}
+
+int tracecmd_msg_send_init_data_virt(int fd)
+{
+ return tracecmd_msg_send_init_data(fd, false);
+}
+
+int tracecmd_msg_connect_to_server(int fd)
+{
+ char buf[TRACECMD_MSG_MAX_LEN];
+ struct tracecmd_msg *msg;
+ int ret;
+
+ msg = (struct tracecmd_msg *)buf;
+ /* connect to a server */
+ ret = tracecmd_msg_send_and_wait_for_msg(fd, MSG_TCONNECT, msg);
+ if (ret < 0) {
+ if (ret == -EPROTONOSUPPORT)
+ goto error;
+ }
+
+ return ret;
+
+error:
+ tracecmd_msg_send_error(fd, msg);
+ return ret;
+}
+
static bool process_option(struct tracecmd_msg_opt *opt)
{
/* currently the only option we have is to us TCP */
diff --git a/trace-msg.h b/trace-msg.h
index b23e72b..502c1bf 100644
--- a/trace-msg.h
+++ b/trace-msg.h
@@ -2,6 +2,9 @@
#define _TRACE_MSG_H_
#include <stdbool.h>
+#define VIRTIO_PORTS "/dev/virtio-ports/"
+#define AGENT_CTL_PATH VIRTIO_PORTS "agent-ctl-path"
+#define TRACE_PATH_CPU VIRTIO_PORTS "trace-path-cpu%d"
#define UDP_MAX_PACKET (65536 - 20)
#define V2_MAGIC "677768\0"
@@ -17,6 +20,7 @@ extern int cpu_count;
extern unsigned int page_size;
extern int *client_ports;
extern bool send_metadata;
+extern int *virt_sfds;
/* for server */
extern bool done;
diff --git a/trace-record.c b/trace-record.c
index 19711df..5ef7508 100644
--- a/trace-record.c
+++ b/trace-record.c
@@ -77,6 +77,9 @@ static struct tracecmd_output *network_handle;
/* Max size to let a per cpu file get */
static int max_kb;
+struct tracecmd_output *virt_handle;
+static bool virt;
+
static int do_ptrace;
static int filter_task;
@@ -1791,6 +1794,9 @@ static int create_recorder(struct buffer_instance *instance, int cpu, int extrac
if (client_ports) {
connect_port(cpu);
recorder = tracecmd_create_recorder_fd(client_ports[cpu], cpu, recorder_flags);
+ } else if (virt_sfds) {
+ recorder = tracecmd_create_recorder_fd(virt_sfds[cpu], cpu,
+ recorder_flags);
} else {
file = get_temp_file(instance, cpu);
recorder = create_recorder_instance(instance, file, cpu);
@@ -1826,7 +1832,7 @@ static void check_first_msg_from_server(int fd)
die("server not tracecmd server");
}
-static void communicate_with_listener_v1(int fd)
+static void communicate_with_listener_v1_net(int fd)
{
char buf[BUFSIZ];
ssize_t n;
@@ -1889,9 +1895,9 @@ static void communicate_with_listener_v1(int fd)
}
}
-static void communicate_with_listener_v2(int fd)
+static void communicate_with_listener_v2_net(int fd)
{
- if (tracecmd_msg_send_init_data(fd) < 0)
+ if (tracecmd_msg_send_init_data_net(fd) < 0)
die("Cannot communicate with server");
}
@@ -1935,6 +1941,15 @@ static void check_protocol_version(int fd)
}
}
+static void communicate_with_listener_virt(int fd)
+{
+ if (tracecmd_msg_connect_to_server(fd) < 0)
+ die("Cannot communicate with server");
+
+ if (tracecmd_msg_send_init_data_virt(fd) < 0)
+ die("Cannot send init data");
+}
+
static void setup_network(void)
{
struct addrinfo hints;
@@ -1990,11 +2005,11 @@ again:
close(sfd);
goto again;
}
- communicate_with_listener_v2(sfd);
+ communicate_with_listener_v2_net(sfd);
}
if (proto_ver == V1_PROTOCOL)
- communicate_with_listener_v1(sfd);
+ communicate_with_listener_v1_net(sfd);
/* Now create the handle through this socket */
network_handle = tracecmd_create_init_fd_glob(sfd, listed_events);
@@ -2005,6 +2020,21 @@ again:
/* OK, we are all set, let'r rip! */
}
+static void setup_virtio(void)
+{
+ int fd;
+
+ fd = open(AGENT_CTL_PATH, O_RDWR);
+ if (fd < 0)
+ die("Cannot open %s", AGENT_CTL_PATH);
+
+ communicate_with_listener_virt(fd);
+
+ /* Now create the handle through this socket */
+ virt_handle = tracecmd_create_init_fd_glob(fd, listed_events);
+ tracecmd_msg_finish_sending_metadata(fd);
+}
+
static void finish_network(void)
{
if (proto_ver == V2_PROTOCOL)
@@ -2013,6 +2043,13 @@ static void finish_network(void)
free(host);
}
+static void finish_virt(void)
+{
+ tracecmd_msg_send_close_msg();
+ free(virt_handle);
+ free(virt_sfds);
+}
+
static void start_threads(void)
{
struct buffer_instance *instance;
@@ -2020,6 +2057,8 @@ static void start_threads(void)
if (host)
setup_network();
+ else if (virt)
+ setup_virtio();
/* make a thread for every CPU we have */
pids = malloc_or_die(sizeof(*pids) * cpu_count * (buffers + 1));
@@ -2089,6 +2128,9 @@ static void record_data(char *date2ts)
if (host) {
finish_network();
return;
+ } else if (virt) {
+ finish_virt();
+ return;
}
if (latency)
@@ -2742,6 +2784,7 @@ static void record_all_events(void)
}
enum {
+ OPT_virt = 252,
OPT_nosplice = 253,
OPT_funcstack = 254,
OPT_date = 255,
@@ -2895,6 +2938,7 @@ void trace_record (int argc, char **argv)
{"date", no_argument, NULL, OPT_date},
{"func-stack", no_argument, NULL, OPT_funcstack},
{"nosplice", no_argument, NULL, OPT_nosplice},
+ {"virt", no_argument, NULL, OPT_virt},
{"help", no_argument, NULL, '?'},
{NULL, 0, NULL, 0}
};
@@ -3025,6 +3069,8 @@ void trace_record (int argc, char **argv)
case 'o':
if (host)
die("-o incompatible with -N");
+ if (virt)
+ die("-o incompatible with --virt");
if (!record && !extract)
die("start does not take output\n"
"Did you mean 'record'?");
@@ -3056,6 +3102,8 @@ void trace_record (int argc, char **argv)
case 'N':
if (!record && !extract)
die("-N only available with record or extract");
+ if (virt)
+ die("-N incompatible with --virt");
if (output)
die("-N incompatible with -o");
host = optarg;
@@ -3071,6 +3119,8 @@ void trace_record (int argc, char **argv)
instance->cpumask = optarg;
break;
case 't':
+ if (virt)
+ die("-t incompatible with --virt");
use_tcp = 1;
break;
case 'b':
@@ -3095,6 +3145,17 @@ void trace_record (int argc, char **argv)
case OPT_nosplice:
recorder_flags |= TRACECMD_RECORD_NOSPLICE;
break;
+ case OPT_virt:
+ if (!record)
+ die("--virt only available with record");
+ if (host)
+ die("--virt incompatible with -N");
+ if (output)
+ die("--virt incompatible with -o");
+ if (use_tcp)
+ die("--virt incompatible with -t");
+ virt = true;
+ break;
default:
usage(argv);
}
diff --git a/trace-usage.c b/trace-usage.c
index 0411cb4..b8c8c71 100644
--- a/trace-usage.c
+++ b/trace-usage.c
@@ -19,7 +19,7 @@ static struct usage_help usage_help[] = {
" %s record [-v][-e event [-f filter]][-p plugin][-F][-d][-D][-o file] \\\n"
" [-s usecs][-O option ][-l func][-g func][-n func] \\\n"
" [-P pid][-N host:port][-t][-r prio][-b size][-B buf][command ...]\n"
- " [-m max]\n"
+ " [-m max][--virt]\n"
" -e run command with event enabled\n"
" -f filter for previous -e event\n"
" -R trigger for previous -e event\n"
@@ -48,6 +48,7 @@ static struct usage_help usage_help[] = {
" -i do not fail if an event is not found\n"
" --func-stack perform a stack trace for function tracer\n"
" (use with caution)\n"
+ " --virt to connect to virt-server\n"
},
{
"start",
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH trace-cmd V5 6/6] trace-cmd/virt-server: Add --dom option which makes a domain directory to virt-server
2014-12-22 17:47 [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache Masami Hiramatsu
` (5 preceding siblings ...)
2014-12-22 17:48 ` [PATCH trace-cmd V5 5/6] trace-cmd/record: Add --virt option for record mode Masami Hiramatsu
@ 2014-12-22 17:48 ` Masami Hiramatsu
2015-05-19 21:06 ` [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache Steven Rostedt
7 siblings, 0 replies; 14+ messages in thread
From: Masami Hiramatsu @ 2014-12-22 17:48 UTC (permalink / raw)
To: Steven Rostedt
Cc: Hidehiro Kawai, yrl.pp-manager.tt, Aaron Fabbri, linux-kernel,
Divya Vyas
Add --dom option which makes a domain directory to virt-server. When a user
already knows domain name of a guest before running virt-server, trace-cmd
should automatically set up I/Fs of the guest. By adding --dom option,
trace-cmd creates a domain directory with 0710 and qemu group.
This patch adds additional options for --dom as follows:
-m <permission>
This option changes the permission of domain directory. If you don't use
this option, the default permission is 0710.
-g <group>
This option changes group of domain directory. If you don't use this option,
the default group is qemu.
-c <cpu>
This option creates trace data I/Fs(trace-path-cpu*.{in,out}) for each CPU
of 'domain'. If you don't use this option, those files are not created.
Here, an example you use this option is written as follows:
- trace-cmd creates a guest1 directory with trace data I/Fs of 2 CPUs.
# trace-cmd virt-server --dom guest1 -c 2
- trace-cmd creates guest2 and guest3 directories
# trace-cmd virt-server --dom guest2 -c 3 --dom guest3 -c 1
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
Changes in V5: Update document.
Changes in V4: Introduce parse_args_virt()
Add usage of virt-server in trace-usage.c
---
Documentation/trace-cmd-virt-server.1.txt | 58 ++++++++---
trace-listen.c | 151 ++++++++++++++++++++++++++---
trace-usage.c | 5 +
3 files changed, 179 insertions(+), 35 deletions(-)
diff --git a/Documentation/trace-cmd-virt-server.1.txt b/Documentation/trace-cmd-virt-server.1.txt
index b775745..19f2b23 100644
--- a/Documentation/trace-cmd-virt-server.1.txt
+++ b/Documentation/trace-cmd-virt-server.1.txt
@@ -34,40 +34,64 @@ OPTIONS
*-l* 'filename'::
This option writes the output messages to a log file instead of standard output.
+*--dom* 'domain'::
+ This option makes a directory for the 'domain'. You can use additional options
+ *-m*, *-g*, *-c* after this option for the 'domain'. If you don't use these
+ additional options, the directory is made as 0710 and qemu group and
+ trace data I/Fs(trace-path-cpu*.{in,out}) are not created.
+
+*-m* 'permission'::
+ This option changes the permission of 'domain' directory. If you don't use
+ this option, the default permission is 0710.
+
+*-g* 'group'::
+ This option changes group of 'domain' directory. If you don't use this option,
+ the default group is qemu.
+
+*-c* 'cpu'::
+ This option creates trace data I/Fs(trace-path-cpu*.{in,out}) for each CPU
+ of 'domain'. If you don't use this option, those files are not created.
+
SETTING
-------
Here, an example is written as follows:
-1. Run virt-server on a host
- # trace-cmd virt-server
-
-2. Make guest domain directory
- # mkdir -p /tmp/trace-cmd/virt/<DOMAIN>
- # chmod 710 /tmp/trace-cmd/virt/<DOMAIN>
- # chgrp qemu /tmp/trace-cmd/virt/<DOMAIN>
-
-3. Make FIFO on the host
- # mkfifo /tmp/trace-cmd/virt/<DOMAIN>/trace-path-cpu{0,1,...,X}.{in,out}
+1. Run virt-server with initializing guest interfaces on a host
+ # trace-cmd virt-server --dom "GUEST" -c 2
-4. Set up of virtio-serial pipe of a guest on the host
+2. Set up of virtio-serial pipe of GUEST on the host
Add the following tags to domain XML files.
- # virsh edit <guest domain>
+ # virsh edit "GUEST"
<channel type='unix'>
<source mode='connect' path='/tmp/trace-cmd/virt/agent-ctl-path'/>
<target type='virtio' name='agent-ctl-path'/>
</channel>
<channel type='pipe'>
- <source path='/tmp/trace-cmd/virt/<DOMAIN>/trace-path-cpu0'/>
+ <source path='/tmp/trace-cmd/virt/guest1/trace-path-cpu0'/>
<target type='virtio' name='trace-path-cpu0'/>
</channel>
- ... (cpu1, cpu2, ...)
+ <channel type='pipe'>
+ <source path='/tmp/trace-cmd/virt/guest1/trace-path-cpu1'/>
+ <target type='virtio' name='trace-path-cpu1'/>
+ </channel>
-5. Boot the guest
- # virsh start <DOMAIN>
+3. Boot the guest
+ # virsh start "GUEST"
-6. Run the guest's client(see trace-cmd-record(1) with the *--virt* option)
+4. Run the guest1's client(see trace-cmd-record(1) with the *--virt* option)
# trace-cmd record -e sched* --virt
+If you want to boot another guest sends trace-data via virtio-serial,
+you will manually make the guest domain directory and trace data I/Fs.
+
+- Make guest domain directory on the host
+ # mkdir -p /tmp/trace-cmd/virt/<DOMAIN>
+ # chmod 710 /tmp/trace-cmd/virt/<DOMAIN>
+ # chgrp qemu /tmp/trace-cmd/virt/<DOMAIN>
+
+- Make FIFO on the host
+ # mkfifo /tmp/trace-cmd/virt/<DOMAIN>/trace-path-cpu{0,1,...,X}.{in,out}
+
SEE ALSO
--------
trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(1),
diff --git a/trace-listen.c b/trace-listen.c
index 718680f..f6d53d2 100644
--- a/trace-listen.c
+++ b/trace-listen.c
@@ -54,11 +54,21 @@ static int backlog = 5;
static int proto_ver;
+struct domain_dir {
+ struct domain_dir *next;
+ char *name;
+ char *group;
+ mode_t perms;
+ int cpu;
+};
+
enum {
NET = 1,
VIRT = 2,
};
+struct domain_dir *dom_dir_list;
+
#define TEMP_FILE_STR_NET "%s.%s:%s.cpu%d", output_file, host, port, cpu
#define TEMP_FILE_STR_VIRT "%s.%s:%d.cpu%d", output_file, domain, virtpid, cpu
static char *get_temp_file(const char *host, const char *port,
@@ -382,7 +392,9 @@ static int open_udp(const char *node, const char *port, int *pid,
#define TRACE_CMD_DIR "/tmp/trace-cmd/"
#define VIRT_DIR TRACE_CMD_DIR "virt/"
#define VIRT_TRACE_CTL_SOCK VIRT_DIR "agent-ctl-path"
-#define TRACE_PATH_DOMAIN_CPU VIRT_DIR "%s/trace-path-cpu%d.out"
+#define VIRT_DOMAIN_DIR VIRT_DIR "%s/"
+#define TRACE_PATH_DOMAIN_CPU_O VIRT_DOMAIN_DIR "trace-path-cpu%d.out"
+#define TRACE_PATH_DOMAIN_CPU_I VIRT_DOMAIN_DIR "trace-path-cpu%d.in"
static int open_virtio_serial_pipe(int *pid, int cpu, int pagesize,
const char *domain, int virtpid)
@@ -390,7 +402,7 @@ static int open_virtio_serial_pipe(int *pid, int cpu, int pagesize,
char buf[PATH_MAX];
int fd;
- snprintf(buf, PATH_MAX, TRACE_PATH_DOMAIN_CPU, domain, cpu);
+ snprintf(buf, PATH_MAX, TRACE_PATH_DOMAIN_CPU_O, domain, cpu);
fd = open(buf, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
warning("open %s", buf);
@@ -998,27 +1010,89 @@ static void do_listen_net(char *port)
kill_clients();
}
-static void make_virt_if_dir(void)
+#define for_each_domain(i) for (i = dom_dir_list; i; i = (i)->next)
+
+static void make_dir_virt(const char *path, mode_t perms, const char *gr_name)
{
struct group *group;
- if (mkdir(TRACE_CMD_DIR, 0710) < 0) {
+ if (mkdir(path, perms) < 0) {
if (errno != EEXIST)
- pdie("mkdir %s", TRACE_CMD_DIR);
+ pdie("mkdir %s", path);
}
- /* QEMU operates as qemu:qemu */
- chmod(TRACE_CMD_DIR, 0710);
- group = getgrnam("qemu");
- if (chown(TRACE_CMD_DIR, -1, group->gr_gid) < 0)
- pdie("chown %s", TRACE_CMD_DIR);
+ chmod(path, perms);
- if (mkdir(VIRT_DIR, 0710) < 0) {
- if (errno != EEXIST)
- pdie("mkdir %s", VIRT_DIR);
+ group = getgrnam(gr_name);
+ if (!group)
+ pdie("getgrnam %s", gr_name);
+ if (chown(path, -1, group->gr_gid) < 0)
+ pdie("chown %s", path);
+}
+
+static void make_traceif_in_dom_dir(const char *name, int cpu)
+{
+ char fifo_in[PATH_MAX];
+ char fifo_out[PATH_MAX];
+ int i;
+
+ for (i = 0; i < cpu; i++) {
+ snprintf(fifo_in, PATH_MAX, TRACE_PATH_DOMAIN_CPU_I, name, i);
+ snprintf(fifo_out, PATH_MAX, TRACE_PATH_DOMAIN_CPU_O, name, i);
+ if (mkfifo(fifo_in, 0644) < 0) {
+ if (errno != EEXIST)
+ pdie("mkfifo %s", fifo_in);
+ }
+ if (mkfifo(fifo_out, 0644) < 0) {
+ if (errno != EEXIST)
+ pdie("mkfifo %s", fifo_out);
+ }
}
- chmod(VIRT_DIR, 0710);
- if (chown(VIRT_DIR, -1, group->gr_gid) < 0)
- pdie("chown %s", VIRT_DIR);
+ plog("CPUS: %d\n", cpu);
+}
+
+static void make_domain_dirs(void)
+{
+ struct domain_dir *dom_dir;
+ char gr_name[5] = "qemu";
+ char buf[PATH_MAX];
+ mode_t perms;
+
+ for_each_domain(dom_dir) {
+ snprintf(buf, PATH_MAX, VIRT_DOMAIN_DIR, dom_dir->name);
+
+ if (dom_dir->perms)
+ perms = dom_dir->perms;
+ else
+ perms = 0710;
+
+ if (dom_dir->group)
+ make_dir_virt(buf, perms, dom_dir->group);
+ else
+ make_dir_virt(buf, perms, gr_name);
+
+ plog("---\n"
+ "Process Directory: %s\n"
+ "Directory permission: %o\n"
+ "Group: %s\n", buf, perms, dom_dir->group ? dom_dir->group : gr_name);
+
+ if (dom_dir->cpu)
+ make_traceif_in_dom_dir(dom_dir->name, dom_dir->cpu);
+ }
+
+ plog("---\n");
+ free(dom_dir_list);
+}
+
+static void make_virt_if_dir(void)
+{
+ char gr_name[5] = "qemu";
+
+ /* QEMU operates as qemu:qemu */
+ make_dir_virt(TRACE_CMD_DIR, 0710, gr_name);
+ make_dir_virt(VIRT_DIR, 0710, gr_name);
+
+ if (dom_dir_list)
+ make_domain_dirs();
}
static void do_listen_virt(void)
@@ -1060,7 +1134,14 @@ static void start_daemon(void)
die("starting daemon");
}
+static void add_dom_dir(struct domain_dir *dom_dir)
+{
+ dom_dir->next = dom_dir_list;
+ dom_dir_list = dom_dir;
+}
+
enum {
+ OPT_dom = 254,
OPT_debug = 255,
};
@@ -1075,6 +1156,37 @@ static void parse_args_net(int c, char **argv, char **port)
}
}
+static void parse_args_virt(int c, char **argv)
+{
+ static struct domain_dir *dom_dir;
+
+ switch (c) {
+ case 'm':
+ if (!dom_dir)
+ die("-m needs --dom <domain>");
+ dom_dir->perms = strtol(optarg, NULL, 8);
+ break;
+ case 'g':
+ if (!dom_dir)
+ die("-g needs --dom <domain>");
+ dom_dir->group = optarg;
+ break;
+ case 'c':
+ if (!dom_dir)
+ die("-c needs --dom <domain>");
+ dom_dir->cpu = atoi(optarg);
+ break;
+ case OPT_dom:
+ dom_dir = malloc_or_die(sizeof(*dom_dir));
+ memset(dom_dir, 0, sizeof(*dom_dir));
+ dom_dir->name = optarg;
+ add_dom_dir(dom_dir);
+ break;
+ default:
+ usage(argv);
+ }
+}
+
void trace_listen(int argc, char **argv)
{
char *logfile = NULL;
@@ -1097,12 +1209,13 @@ void trace_listen(int argc, char **argv)
int option_index = 0;
static struct option long_options[] = {
{"port", required_argument, NULL, 'p'},
+ {"dom", required_argument, NULL, OPT_dom},
{"help", no_argument, NULL, '?'},
{"debug", no_argument, NULL, OPT_debug},
{NULL, 0, NULL, 0}
};
- c = getopt_long (argc-1, argv+1, "+hp:o:d:l:D",
+ c = getopt_long (argc-1, argv+1, "+hp:o:d:l:Dm:g:c:",
long_options, &option_index);
if (c == -1)
break;
@@ -1128,12 +1241,14 @@ void trace_listen(int argc, char **argv)
default:
if (mode == NET)
parse_args_net(c, argv, &port);
+ else if (mode == VIRT)
+ parse_args_virt(c, argv);
else
usage(argv);
}
}
- if (!port && mode == NET)
+ if (!port && (mode == NET))
usage(argv);
if ((argc - optind) >= 2)
diff --git a/trace-usage.c b/trace-usage.c
index b8c8c71..45865f0 100644
--- a/trace-usage.c
+++ b/trace-usage.c
@@ -187,11 +187,16 @@ static struct usage_help usage_help[] = {
"virt-server",
"listen on a virtio-serial for trace clients",
" %s virt-server [-o file][-d dir][-l logfile]\n"
+ " [--dom domain [-m permisson] [-g group] [-c cpu]]\n"
" Creates a socket to listen for clients.\n"
" -D create it in daemon mode.\n"
" -o file name to use for clients.\n"
" -d diretory to store client files.\n"
" -l logfile to write messages to.\n"
+ " --dom create domain direcroty in /tmp/trace-cmd/virt and folling directory permissions/group names and FIFO files will be changed here\n"
+ " -m changes the permission of domain directory.\n"
+ " -g changes group of domain directory.\n"
+ " -c creates trace data I/F(trace-path-cpu*.{in, out} files) in domain directory.\n"
},
{
"list",
^ permalink raw reply related [flat|nested] 14+ messages in thread* Re: [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache
2014-12-22 17:47 [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache Masami Hiramatsu
` (6 preceding siblings ...)
2014-12-22 17:48 ` [PATCH trace-cmd V5 6/6] trace-cmd/virt-server: Add --dom option which makes a domain directory to virt-server Masami Hiramatsu
@ 2015-05-19 21:06 ` Steven Rostedt
7 siblings, 0 replies; 14+ messages in thread
From: Steven Rostedt @ 2015-05-19 21:06 UTC (permalink / raw)
To: Masami Hiramatsu
Cc: Hidehiro Kawai, yrl.pp-manager.tt, Aaron Fabbri, linux-kernel,
Divya Vyas
On Mon, 22 Dec 2014 12:47:36 -0500
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:
> Hi,
>
> This is the version 5 series of virtio-trace for trace-cmd.
> The previous series is here; https://lkml.org/lkml/2014/7/10/747
>
> I took over this work from Yoshihiro Yunomae. This version includes
> some fixes.
> - Add -N support for extract subcommand(1/6).
> - As Steven suggested, this send "-1V2\0<MAGIC>\0" instead
> of "V2\0<MAGIC>\0" at first.
> - Add a document of Protocol change in Documentation/Protocol.txt.
> (Now all the protocol descriptions are moved into that)
> - Cleanup the code and document a bit.
>
Hi Masami,
I finally got some time to takes some serious look at this patch set.
I'll start playing with it this week.
-- Steve
^ permalink raw reply [flat|nested] 14+ messages in thread