Commit a359c17a authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo

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: default avatarJiri 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@kravaSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 38af91f0
...@@ -55,6 +55,7 @@ struct record_opts { ...@@ -55,6 +55,7 @@ struct record_opts {
bool all_user; bool all_user;
bool tail_synthesize; bool tail_synthesize;
bool overwrite; bool overwrite;
bool ignore_missing_thread;
unsigned int freq; unsigned int freq;
unsigned int mmap_pages; unsigned int mmap_pages;
unsigned int auxtrace_mmap_pages; unsigned int auxtrace_mmap_pages;
......
...@@ -990,6 +990,8 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts, ...@@ -990,6 +990,8 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
* it overloads any global configuration. * it overloads any global configuration.
*/ */
apply_config_terms(evsel, opts); 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) 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, ...@@ -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); 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, static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
struct thread_map *threads) struct thread_map *threads)
{ {
...@@ -1491,6 +1520,21 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus, ...@@ -1491,6 +1520,21 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
if (fd < 0) { if (fd < 0) {
err = -errno; 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", pr_debug2("\nsys_perf_event_open failed, error %d\n",
err); err);
goto try_fallback; goto try_fallback;
......
...@@ -120,6 +120,7 @@ struct perf_evsel { ...@@ -120,6 +120,7 @@ struct perf_evsel {
bool tracking; bool tracking;
bool per_pkg; bool per_pkg;
bool precise_max; bool precise_max;
bool ignore_missing_thread;
/* parse modifier helper */ /* parse modifier helper */
int exclude_GH; int exclude_GH;
int nr_members; int nr_members;
......
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