[tip:perf/urgent] perf script: Add support for dumping symbols

tip-bot for David Ahern
2011-03-16T13:55:56Z

Commit-ID: c0230b2bfbd16e42d937c34aed99e5d6493eb5e4
Gitweb: http://git.kernel.org/tip/c0230b2bfbd16e42d937c34aed99e5d6493eb5e4
Author: David Ahern <daahern@cisco.com>
AuthorDate: Wed, 9 Mar 2011 22:23:27 -0700
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 14 Mar 2011 17:06:50 -0300

perf script: Add support for dumping symbols

Add option to dump symbols found in events.

e.g., perf script -f comm,pid,tid,time,trace,sym

swapper 0/0 537.037184: prev_comm=swapper prev_pid=0 prev_prio=120...
ffffffff81030350 perf_trace_sched_switch ([kernel.kallsyms])
ffffffff81382ac5 schedule ([kernel.kallsyms])
ffffffff8100134a cpu_idle ([kernel.kallsyms])
ffffffff81370b39 rest_init ([kernel.kallsyms])
ffffffff81696c23 start_kernel ([kernel.kallsyms].init.text)
ffffffff816962af x86_64_start_reservations ([kernel.kallsyms].init.text)
ffffffff816963b9 x86_64_start_kernel ([kernel.kallsyms].init.text)

sshd 1675/1675 537.037309: prev_comm=sshd prev_pid=1675 prev_prio=120...
ffffffff81030350 perf_trace_sched_switch ([kernel.kallsyms])
ffffffff81382ac5 schedule ([kernel.kallsyms])
ffffffff813837aa schedule_hrtimeout_range_clock ([kernel.kallsyms])
ffffffff81383886 schedule_hrtimeout_range ([kernel.kallsyms])
ffffffff8110c4f9 poll_schedule_timeout ([kernel.kallsyms])
ffffffff8110cd20 do_select ([kernel.kallsyms])
ffffffff8110ced8 core_sys_select ([kernel.kallsyms])
ffffffff8110d00d sys_select ([kernel.kallsyms])
ffffffff81002bc2 system_call ([kernel.kallsyms])
7f1647e56e93 __GI_select (/lib64/libc-2.12.90.so)

netstat 1692/1692 537.038664: prev_comm=netstat prev_pid=1692 prev_prio=...
ffffffff81030350 perf_trace_sched_switch ([kernel.kallsyms])
ffffffff81382ac5 schedule ([kernel.kallsyms])
ffffffff81002c3a sysret_careful ([kernel.kallsyms])
7f7a6cd1b210 __GI___libc_read (/lib64/libc-2.12.90.so)

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <1299734608-5223-6-git-send-email-daahern@cisco.com>
Signed-off-by: David Ahern <daahern@cisco.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/Documentation/perf-script.txt | 16 +++++++-
tools/perf/builtin-script.c | 31 +++++++++++++++-
tools/perf/util/session.c | 61 ++++++++++++++++++++++++++++++
tools/perf/util/session.h | 4 ++
4 files changed, 110 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index b73cf58..c64118a 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -115,7 +115,21 @@ OPTIONS
-f::
--fields
Comma separated list of fields to print. Options are:
- comm, tid, pid, time, cpu, event, trace
+ comm, tid, pid, time, cpu, event, trace, sym
+
+-k::
+--vmlinux=<file>::
+ vmlinux pathname
+
+--kallsyms=<file>::
+ kallsyms pathname
+
+--symfs=<directory>::
+ Look for files with symbols relative to this directory.
+
+-G::
+--hide-call-graph::
+ When printing symbols do not display call chain.

SEE ALSO
--------
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index c046e6e..b45b09c 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -19,6 +19,7 @@ static bool debug_mode;
static u64 last_timestamp;
static u64 nr_unordered;
extern const struct option record_options[];
+static bool no_callchain;

enum perf_output_field {
PERF_OUTPUT_COMM = 1U << 0,
@@ -28,6 +29,7 @@ enum perf_output_field {
PERF_OUTPUT_CPU = 1U << 4,
PERF_OUTPUT_EVNAME = 1U << 5,
PERF_OUTPUT_TRACE = 1U << 6,
+ PERF_OUTPUT_SYM = 1U << 7,
};

struct output_option {
@@ -41,6 +43,7 @@ struct output_option {
{.str = "cpu", .field = PERF_OUTPUT_CPU},
{.str = "event", .field = PERF_OUTPUT_EVNAME},
{.str = "trace", .field = PERF_OUTPUT_TRACE},
+ {.str = "sym", .field = PERF_OUTPUT_SYM},
};

/* default set to maintain compatibility with current format */
@@ -65,6 +68,8 @@ static void print_sample_start(struct perf_sample *sample,
if (PRINT_FIELD(COMM)) {
if (latency_format)
printf("%8.8s ", thread->comm);
+ else if (PRINT_FIELD(SYM) && symbol_conf.use_callchain)
+ printf("%s ", thread->comm);
else
printf("%16s ", thread->comm);
}
@@ -112,6 +117,14 @@ static void process_event(union perf_event *event __unused,
print_trace_event(sample->cpu, sample->raw_data,
sample->raw_size);

+ if (PRINT_FIELD(SYM)) {
+ if (!symbol_conf.use_callchain)
+ printf(" ");
+ else
+ printf("\n");
+ perf_session__print_symbols(event, sample, session);
+ }
+
printf("\n");
}

@@ -190,7 +203,10 @@ static int process_sample_event(union perf_event *event,

static struct perf_event_ops event_ops = {
.sample = process_sample_event,
+ .mmap = perf_event__process_mmap,
.comm = perf_event__process_comm,
+ .exit = perf_event__process_task,
+ .fork = perf_event__process_task,
.attr = perf_event__process_attr,
.event_type = perf_event__process_event_type,
.tracing_data = perf_event__process_tracing_data,
@@ -722,8 +738,16 @@ static const struct option options[] = {
"input file name"),
OPT_BOOLEAN('d', "debug-mode", &debug_mode,
"do various checks like samples ordering and lost events"),
+ OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
+ "file", "vmlinux pathname"),
+ OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
+ "file", "kallsyms pathname"),
+ OPT_BOOLEAN('G', "hide-call-graph", &no_callchain,
+ "When printing symbols do not display call chain"),
+ OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
+ "Look for files with symbols relative to this directory"),
OPT_CALLBACK('f', "fields", NULL, "str",
- "comma separated output fields. Options: comm,tid,pid,time,cpu,event,trace",
+ "comma separated output fields. Options: comm,tid,pid,time,cpu,event,trace,sym",
parse_output_fields),

OPT_END()
@@ -905,6 +929,11 @@ int cmd_script(int argc, const char **argv, const char *prefix __used)
if (session == NULL)
return -ENOMEM;

+ if (!no_callchain && (session->sample_type & PERF_SAMPLE_CALLCHAIN))
+ symbol_conf.use_callchain = true;
+ else
+ symbol_conf.use_callchain = false;
+
if (strcmp(input_name, "-") &&
!perf_session__has_traces(session, "record -R"))
return -EINVAL;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index f26639f..c68cf40 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1134,3 +1134,64 @@ size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)

return ret;
}
+
+void perf_session__print_symbols(union perf_event *event,
+ struct perf_sample *sample,
+ struct perf_session *session)
+{
+ struct addr_location al;
+ const char *symname, *dsoname;
+ struct callchain_cursor *cursor = &session->callchain_cursor;
+ struct callchain_cursor_node *node;
+
+ if (perf_event__preprocess_sample(event, session, &al, sample,
+ NULL) < 0) {
+ error("problem processing %d event, skipping it.\n",
+ event->header.type);
+ return;
+ }
+
+ if (symbol_conf.use_callchain && sample->callchain) {
+
+ if (perf_session__resolve_callchain(session, al.thread,
+ sample->callchain, NULL) != 0) {
+ if (verbose)
+ error("Failed to resolve callchain. Skipping\n");
+ return;
+ }
+ callchain_cursor_commit(cursor);
+
+ while (1) {
+ node = callchain_cursor_current(cursor);
+ if (!node)
+ break;
+
+ if (node->sym && node->sym->name)
+ symname = node->sym->name;
+ else
+ symname = "";
+
+ if (node->map && node->map->dso && node->map->dso->name)
+ dsoname = node->map->dso->name;
+ else
+ dsoname = "";
+
+ printf("\t%16" PRIx64 " %s (%s)\n", node->ip, symname, dsoname);
+
+ callchain_cursor_advance(cursor);
+ }
+
+ } else {
+ if (al.sym && al.sym->name)
+ symname = al.sym->name;
+ else
+ symname = "";
+
+ if (al.map && al.map->dso && al.map->dso->name)
+ dsoname = al.map->dso->name;
+ else
+ dsoname = "";
+
+ printf("%16" PRIx64 " %s (%s)", al.addr, symname, dsoname);
+ }
+}
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index b5b148b..0b3c9af 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -159,4 +159,8 @@ static inline int perf_session__parse_sample(struct perf_session *session,
session->sample_id_all, sample);
}

+void perf_session__print_symbols(union perf_event *event,
+ struct perf_sample *sample,
+ struct perf_session *session);
+
#endif /* __PERF_SESSION_H */