diff options
| author | Levi Yun <yeoreum.yun@arm.com> | 2024-09-25 14:20:21 +0100 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2024-09-25 15:58:42 -0700 |
| commit | e880a70f8046df0dd9089fa60dcb866a2cc69194 (patch) | |
| tree | 7f66c392be02be32cd60917a27585c041ab5fbc2 /tools/perf/util/evlist.c | |
| parent | f115506d2ce4549df306746cd0b1c5d7bf6537f5 (diff) | |
perf stat: Close cork_fd when create_perf_stat_counter() failed
When create_perf_stat_counter() failed, it doesn't close workload.cork_fd
open in evlist__prepare_workload(). This could make too many open file
error while __run_perf_stat() repeats.
Introduce evlist__cancel_workload to close workload.cork_fd and
wait workload.child_pid until exit to clear child process
when create_perf_stat_counter() is failed.
Signed-off-by: Levi Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: nd@arm.com
Cc: howardchu95@gmail.com
Link: https://lore.kernel.org/r/20240925132022.2650180-2-yeoreum.yun@arm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Diffstat (limited to 'tools/perf/util/evlist.c')
| -rw-r--r-- | tools/perf/util/evlist.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index f14b7e6ff1dc..a9df84692d4a 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -48,6 +48,7 @@ #include <sys/mman.h> #include <sys/prctl.h> #include <sys/timerfd.h> +#include <sys/wait.h> #include <linux/bitops.h> #include <linux/hash.h> @@ -1484,6 +1485,8 @@ int evlist__prepare_workload(struct evlist *evlist, struct target *target, const int child_ready_pipe[2], go_pipe[2]; char bf; + evlist->workload.cork_fd = -1; + if (pipe(child_ready_pipe) < 0) { perror("failed to create 'ready' pipe"); return -1; @@ -1536,7 +1539,7 @@ int evlist__prepare_workload(struct evlist *evlist, struct target *target, const * For cancelling the workload without actually running it, * the parent will just close workload.cork_fd, without writing * anything, i.e. read will return zero and we just exit() - * here. + * here (See evlist__cancel_workload()). */ if (ret != 1) { if (ret == -1) @@ -1600,7 +1603,7 @@ out_close_ready_pipe: int evlist__start_workload(struct evlist *evlist) { - if (evlist->workload.cork_fd > 0) { + if (evlist->workload.cork_fd >= 0) { char bf = 0; int ret; /* @@ -1611,12 +1614,24 @@ int evlist__start_workload(struct evlist *evlist) perror("unable to write to pipe"); close(evlist->workload.cork_fd); + evlist->workload.cork_fd = -1; return ret; } return 0; } +void evlist__cancel_workload(struct evlist *evlist) +{ + int status; + + if (evlist->workload.cork_fd >= 0) { + close(evlist->workload.cork_fd); + evlist->workload.cork_fd = -1; + waitpid(evlist->workload.pid, &status, WNOHANG); + } +} + int evlist__parse_sample(struct evlist *evlist, union perf_event *event, struct perf_sample *sample) { struct evsel *evsel = evlist__event2evsel(evlist, event); |