From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=52783 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OFvw6-0005f0-FA for qemu-devel@nongnu.org; Sat, 22 May 2010 17:08:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OFvvz-0004RY-ET for qemu-devel@nongnu.org; Sat, 22 May 2010 17:08:46 -0400 Received: from mtagate5.de.ibm.com ([195.212.17.165]:38211) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OFvvz-0004Qi-2K for qemu-devel@nongnu.org; Sat, 22 May 2010 17:08:39 -0400 Received: from d12nrmr1607.megacenter.de.ibm.com (d12nrmr1607.megacenter.de.ibm.com [9.149.167.49]) by mtagate5.de.ibm.com (8.13.1/8.13.1) with ESMTP id o4ML8aKE027631 for ; Sat, 22 May 2010 21:08:36 GMT Received: from d12av04.megacenter.de.ibm.com (d12av04.megacenter.de.ibm.com [9.149.165.229]) by d12nrmr1607.megacenter.de.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id o4ML8UCg798768 for ; Sat, 22 May 2010 23:08:36 +0200 Received: from d12av04.megacenter.de.ibm.com (loopback [127.0.0.1]) by d12av04.megacenter.de.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id o4ML8Uqx021970 for ; Sat, 22 May 2010 23:08:30 +0200 From: Stefan Hajnoczi Date: Sat, 22 May 2010 22:08:20 +0100 Message-Id: <1274562503-10713-3-git-send-email-stefanha@linux.vnet.ibm.com> In-Reply-To: <1274562503-10713-1-git-send-email-stefanha@linux.vnet.ibm.com> References: <1274562503-10713-1-git-send-email-stefanha@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH 2/5] trace: Add simple built-in tracing backend List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, kvm@vger.kernel.org Cc: Jan Kiszka , Anthony Liguori , Stefan Hajnoczi , Prerna Saxena This patch adds a simple tracer which produces binary trace files and is built into QEMU. The main purpose of this patch is to show how new tracing backends can be added to tracetool. To try out the simple backend: ./configure --trace-backend=simple make After running QEMU you can pretty-print the trace: ./tracetool --simple --py events.py # first time only ./simpletrace.py /tmp/trace.log Signed-off-by: Stefan Hajnoczi --- This is the same trivial tracer that I posted previously. .gitignore | 2 + Makefile.objs | 3 + configure | 2 +- simpletrace.c | 64 ++++++++++++++++++++++++++++ simpletrace.py | 38 +++++++++++++++++ tracetool | 127 ++++++++++++++++++++++++++++++++++++++++++++++++++++++- 6 files changed, 232 insertions(+), 4 deletions(-) create mode 100644 simpletrace.c create mode 100755 simpletrace.py diff --git a/.gitignore b/.gitignore index 4644557..68fb21d 100644 --- a/.gitignore +++ b/.gitignore @@ -4,6 +4,7 @@ config-host.* config-target.* trace.h trace.c +events.py *-softmmu *-darwin-user *-linux-user @@ -39,6 +40,7 @@ qemu-monitor.texi *.log *.pdf *.pg +*.pyc *.toc *.tp *.vr diff --git a/Makefile.objs b/Makefile.objs index 9bbdf6f..d870767 100644 --- a/Makefile.objs +++ b/Makefile.objs @@ -252,6 +252,9 @@ libdis-$(CONFIG_SPARC_DIS) += sparc-dis.o # trace trace-obj-y = trace.o +ifeq ($(TRACE_BACKEND),simple) +trace-obj-y += simpletrace.o +endif vl.o: QEMU_CFLAGS+=$(GPROF_CFLAGS) diff --git a/configure b/configure index 5e66f3a..d599879 100755 --- a/configure +++ b/configure @@ -829,7 +829,7 @@ echo " --enable-docs enable documentation build" echo " --disable-docs disable documentation build" echo " --disable-vhost-net disable vhost-net acceleration support" echo " --enable-vhost-net enable vhost-net acceleration support" -echo " --trace-backend=B Trace backend nop" +echo " --trace-backend=B Trace backend nop simple" echo "" echo "NOTE: The object files are built at the place where configure is launched" exit 1 diff --git a/simpletrace.c b/simpletrace.c new file mode 100644 index 0000000..2fec4d3 --- /dev/null +++ b/simpletrace.c @@ -0,0 +1,64 @@ +#include +#include +#include "trace.h" + +typedef struct { + unsigned long event; + unsigned long x1; + unsigned long x2; + unsigned long x3; + unsigned long x4; + unsigned long x5; +} TraceRecord; + +enum { + TRACE_BUF_LEN = 64 * 1024 / sizeof(TraceRecord), +}; + +static TraceRecord trace_buf[TRACE_BUF_LEN]; +static unsigned int trace_idx; +static FILE *trace_fp; + +static void trace(TraceEvent event, unsigned long x1, + unsigned long x2, unsigned long x3, + unsigned long x4, unsigned long x5) { + TraceRecord *rec = &trace_buf[trace_idx]; + rec->event = event; + rec->x1 = x1; + rec->x2 = x2; + rec->x3 = x3; + rec->x4 = x4; + rec->x5 = x5; + + if (++trace_idx == TRACE_BUF_LEN) { + trace_idx = 0; + + if (!trace_fp) { + trace_fp = fopen("/tmp/trace.log", "w"); + } + if (trace_fp) { + size_t result = fwrite(trace_buf, sizeof trace_buf, 1, trace_fp); + result = result; + } + } +} + +void trace1(TraceEvent event, unsigned long x1) { + trace(event, x1, 0, 0, 0, 0); +} + +void trace2(TraceEvent event, unsigned long x1, unsigned long x2) { + trace(event, x1, x2, 0, 0, 0); +} + +void trace3(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long x3) { + trace(event, x1, x2, x3, 0, 0); +} + +void trace4(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long x4) { + trace(event, x1, x2, x3, x4, 0); +} + +void trace5(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long x4, unsigned long x5) { + trace(event, x1, x2, x3, x4, x5); +} diff --git a/simpletrace.py b/simpletrace.py new file mode 100755 index 0000000..70609cf --- /dev/null +++ b/simpletrace.py @@ -0,0 +1,38 @@ +#!/usr/bin/env python +import sys +import struct + +try: + from events import events +except ImportError: + sys.stderr.write('''Unable to import trace events from current working directory. Please run: +tracetool --simple --py events.py\n''') + sys.exit(1) + +trace_fmt = 'LLLLLL' +trace_len = struct.calcsize(trace_fmt) + +def read_record(fobj): + s = fobj.read(trace_len) + if len(s) != trace_len: + return None + return struct.unpack(trace_fmt, s) + +def format_record(rec): + event = events[rec[0]] + fields = [event[0]] + for i in xrange(1, len(event)): + fields.append('%s=0x%x' % (event[i], rec[i])) + return ' '.join(fields) + +if len(sys.argv) != 2: + sys.stderr.write('usage: %s \n' % sys.argv[0]) + sys.exit(1) + +f = open(sys.argv[1], 'rb') +while True: + rec = read_record(f) + if rec is None: + break + + print format_record(rec) diff --git a/tracetool b/tracetool index e243d42..bcd163e 100755 --- a/tracetool +++ b/tracetool @@ -3,15 +3,17 @@ usage() { cat >&2 <