From: Mengting Zhang zhangmengting@huawei.com
[ Upstream commit ca8000684ec4e66f965e1f9547a3c6cb834154ca ]
While monitoring a multithread process with pid option, perf sometimes may return sys_perf_event_open failure with 3(No such process) if any of the process's threads die before we open the event. However, we want perf continue monitoring the remaining threads and do not exit with error.
Here, the patch enables perf_evsel::ignore_missing_thread for -p option to ignore complete failure if any of threads die before we open the event. But it may still return sys_perf_event_open failure with 22(Invalid) if we monitors several event groups.
sys_perf_event_open: pid 28960 cpu 40 group_fd 118202 flags 0x8 sys_perf_event_open: pid 28961 cpu 40 group_fd 118203 flags 0x8 WARNING: Ignored open failure for pid 28962 sys_perf_event_open: pid 28962 cpu 40 group_fd [118203] flags 0x8 sys_perf_event_open failed, error -22
That is because when we ignore a missing thread, we change the thread_idx without dealing with its fds, FD(evsel, cpu, thread). Then get_group_fd() may return a wrong group_fd for the next thread and sys_perf_event_open() return with 22.
sys_perf_event_open(){ ... if (group_fd != -1) perf_fget_light()//to get corresponding group_leader by group_fd ... if (group_leader) if (group_leader->ctx->task != ctx->task)//should on the same task goto err_context ... }
This patch also fixes this bug by introducing perf_evsel__remove_fd() and update_fds to allow removing fds for the missing thread.
Changes since v1: - Change group_fd__remove() into a more genetic way without changing code logic - Remove redundant condition
Changes since v2: - Use a proper function name and add some comment. - Multiline comment style fixes.
Committer testing:
Before this patch the recently added 'perf stat --per-thread' for system wide counting would race while enumerating all threads using /proc:
[root@jouet ~]# perf stat --per-thread failed to parse CPUs map: No such file or directory
Usage: perf stat [<options>] [<command>]
-C, --cpu <cpu> list of cpus to monitor in system-wide -a, --all-cpus system-wide collection from all CPUs [root@jouet ~]# perf stat --per-thread failed to parse CPUs map: No such file or directory
Usage: perf stat [<options>] [<command>]
-C, --cpu <cpu> list of cpus to monitor in system-wide -a, --all-cpus system-wide collection from all CPUs [root@jouet ~]#
When, say, the kernel was being built, so lots of shortlived threads, after this patch this doesn't happen.
Signed-off-by: Mengting Zhang zhangmengting@huawei.com Tested-by: Arnaldo Carvalho de Melo acme@redhat.com Acked-by: Jiri Olsa jolsa@redhat.com Cc: Cheng Jian cj.chengjian@huawei.com Cc: Li Bin huawei.libin@huawei.com Cc: Wang Nan wangnan0@huawei.com Link: http://lkml.kernel.org/r/1513148513-6974-1-git-send-email-zhangmengting@huaw... [ Remove one use 'evlist' alias variable ] Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- tools/perf/builtin-record.c | 4 ++-- tools/perf/util/evsel.c | 47 +++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 47 insertions(+), 4 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 0c95ffefb6cc..1957abc1c8cf 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -1856,8 +1856,8 @@ int cmd_record(int argc, const char **argv) goto out; }
- /* Enable ignoring missing threads when -u option is defined. */ - rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX; + /* Enable ignoring missing threads when -u/-p option is defined. */ + rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
err = -ENOMEM; if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 1f6beb3d0c68..ac19130c14d8 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1591,10 +1591,46 @@ static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, return fprintf(fp, " %-32s %s\n", name, val); }
+static void perf_evsel__remove_fd(struct perf_evsel *pos, + int nr_cpus, int nr_threads, + int thread_idx) +{ + for (int cpu = 0; cpu < nr_cpus; cpu++) + for (int thread = thread_idx; thread < nr_threads - 1; thread++) + FD(pos, cpu, thread) = FD(pos, cpu, thread + 1); +} + +static int update_fds(struct perf_evsel *evsel, + int nr_cpus, int cpu_idx, + int nr_threads, int thread_idx) +{ + struct perf_evsel *pos; + + if (cpu_idx >= nr_cpus || thread_idx >= nr_threads) + return -EINVAL; + + evlist__for_each_entry(evsel->evlist, pos) { + nr_cpus = pos != evsel ? nr_cpus : cpu_idx; + + perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx); + + /* + * Since fds for next evsel has not been created, + * there is no need to iterate whole event list. + */ + if (pos == evsel) + break; + } + return 0; +} + static bool ignore_missing_thread(struct perf_evsel *evsel, + int nr_cpus, int cpu, struct thread_map *threads, int thread, int err) { + pid_t ignore_pid = thread_map__pid(threads, thread); + if (!evsel->ignore_missing_thread) return false;
@@ -1610,11 +1646,18 @@ static bool ignore_missing_thread(struct perf_evsel *evsel, if (threads->nr == 1) return false;
+ /* + * We should remove fd for missing_thread first + * because thread_map__remove() will decrease threads->nr. + */ + if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread)) + 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)); + ignore_pid); return true; }
@@ -1719,7 +1762,7 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus, if (fd < 0) { err = -errno;
- if (ignore_missing_thread(evsel, threads, thread, err)) { + if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) { /* * We just removed 1 thread, so take a step * back on thread index and lower the upper