perf evsel: Allow to ignore missing pid

Adding perf_evsel::ignore_missing_cpu_thread bool.

When set true, it allows perf to ignore error of missing pid of perf
event syscall.

We remove missing thread id from the thread_map, so the rest of the
processing like ioctl and mmap won't get disturbed with -1 fd.

The reason for supporting this is to ease up monitoring group of pids,
that 'disappear' before perf opens their event. This currently leads
perf to report error and exit and makes perf record's -u option unusable
under certain setup.

With this change we will allow this race and ignore such failure with
following warning:

  WARNING: Ignored open failure for pid 8605

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20161213074622.GA3084@krava
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2016-12-13 08:46:22 +01:00 committed by Arnaldo Carvalho de Melo
parent 38af91f01d
commit a359c17a7e
3 changed files with 46 additions and 0 deletions

View file

@ -55,6 +55,7 @@ struct record_opts {
bool all_user;
bool tail_synthesize;
bool overwrite;
bool ignore_missing_thread;
unsigned int freq;
unsigned int mmap_pages;
unsigned int auxtrace_mmap_pages;

View file

@ -990,6 +990,8 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
* it overloads any global configuration.
*/
apply_config_terms(evsel, opts);
evsel->ignore_missing_thread = opts->ignore_missing_thread;
}
static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
@ -1419,6 +1421,33 @@ static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
return fprintf(fp, " %-32s %s\n", name, val);
}
static bool ignore_missing_thread(struct perf_evsel *evsel,
struct thread_map *threads,
int thread, int err)
{
if (!evsel->ignore_missing_thread)
return false;
/* The system wide setup does not work with threads. */
if (evsel->system_wide)
return false;
/* The -ESRCH is perf event syscall errno for pid's not found. */
if (err != -ESRCH)
return false;
/* If there's only one thread, let it fail. */
if (threads->nr == 1)
return false;
if (thread_map__remove(threads, thread))
return false;
pr_warning("WARNING: Ignored open failure for pid %d\n",
thread_map__pid(threads, thread));
return true;
}
static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
struct thread_map *threads)
{
@ -1491,6 +1520,21 @@ retry_open:
if (fd < 0) {
err = -errno;
if (ignore_missing_thread(evsel, threads, thread, err)) {
/*
* We just removed 1 thread, so take a step
* back on thread index and lower the upper
* nthreads limit.
*/
nthreads--;
thread--;
/* ... and pretend like nothing have happened. */
err = 0;
continue;
}
pr_debug2("\nsys_perf_event_open failed, error %d\n",
err);
goto try_fallback;

View file

@ -120,6 +120,7 @@ struct perf_evsel {
bool tracking;
bool per_pkg;
bool precise_max;
bool ignore_missing_thread;
/* parse modifier helper */
int exclude_GH;
int nr_members;