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perf trace: Allow specifying which syscalls to trace

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Similar to -e in strace, i.e. a comma separated list of syscall names
to trace.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-5zku7q5wug3103k1dzn3yy63@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2013-08-09 12:28:31 -03:00
parent c5885749e4
commit 2ae3a312c0
2 changed files with 50 additions and 6 deletions
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4
tools/perf/Documentation/perf-trace.txt
View File

@ -26,6 +26,10 @@ OPTIONS
--all-cpus::
System-wide collection from all CPUs.
-e::
--expr::
List of events to show, currently only syscall names.
-p::
--pid=::
Record events on existing process ID (comma separated list).

52
tools/perf/builtin-trace.c
View File

@ -5,6 +5,7 @@
#include "util/machine.h"
#include "util/thread.h"
#include "util/parse-options.h"
#include "util/strlist.h"
#include "util/thread_map.h"
#include <libaudit.h>
@ -47,6 +48,7 @@ static struct syscall_fmt *syscall_fmt__find(const char *name)
struct syscall {
struct event_format *tp_format;
const char *name;
bool filtered;
struct syscall_fmt *fmt;
};
@ -110,6 +112,7 @@ struct trace {
struct perf_record_opts opts;
struct machine host;
u64 base_time;
struct strlist *ev_qualifier;
unsigned long nr_events;
bool sched;
bool multiple_threads;
@ -226,6 +229,16 @@ static int trace__read_syscall_info(struct trace *trace, int id)
sc = trace->syscalls.table + id;
sc->name = name;
if (trace->ev_qualifier && !strlist__find(trace->ev_qualifier, name)) {
sc->filtered = true;
/*
* No need to do read tracepoint information since this will be
* filtered out.
*/
return 0;
}
sc->fmt = syscall_fmt__find(sc->name);
snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name);
@ -302,11 +315,19 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
char *msg;
void *args;
size_t printed = 0;
struct thread *thread = machine__findnew_thread(&trace->host, sample->tid);
struct thread *thread;
struct syscall *sc = trace__syscall_info(trace, evsel, sample);
struct thread_trace *ttrace = thread__trace(thread);
struct thread_trace *ttrace;
if (ttrace == NULL || sc == NULL)
if (sc == NULL)
return -1;
if (sc->filtered)
return 0;
thread = machine__findnew_thread(&trace->host, sample->tid);
ttrace = thread__trace(thread);
if (ttrace == NULL)
return -1;
args = perf_evsel__rawptr(evsel, sample, "args");
@ -345,11 +366,19 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
{
int ret;
u64 duration = 0;
struct thread *thread = machine__findnew_thread(&trace->host, sample->tid);
struct thread_trace *ttrace = thread__trace(thread);
struct thread *thread;
struct syscall *sc = trace__syscall_info(trace, evsel, sample);
struct thread_trace *ttrace;
if (ttrace == NULL || sc == NULL)
if (sc == NULL)
return -1;
if (sc->filtered)
return 0;
thread = machine__findnew_thread(&trace->host, sample->tid);
ttrace = thread__trace(thread);
if (ttrace == NULL)
return -1;
ret = perf_evsel__intval(evsel, sample, "ret");
@ -634,7 +663,10 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
.mmap_pages = 1024,
},
};
const char *ev_qualifier_str = NULL;
const struct option trace_options[] = {
OPT_STRING('e', "expr", &ev_qualifier_str, "expr",
"list of events to trace"),
OPT_STRING('p', "pid", &trace.opts.target.pid, "pid",
"trace events on existing process id"),
OPT_STRING(0, "tid", &trace.opts.target.tid, "tid",
@ -660,6 +692,14 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
argc = parse_options(argc, argv, trace_options, trace_usage, 0);
if (ev_qualifier_str != NULL) {
trace.ev_qualifier = strlist__new(true, ev_qualifier_str);
if (trace.ev_qualifier == NULL) {
puts("Not enough memory to parse event qualifier");
return -ENOMEM;
}
}
err = perf_target__validate(&trace.opts.target);
if (err) {
perf_target__strerror(&trace.opts.target, err, bf, sizeof(bf));