From ba361c92e73c771fcbbbd24c2c03c322e2de2e31 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Wed, 17 Oct 2012 18:50:13 -0300 Subject: [PATCH] perf tools: Don't stop synthesizing threads when one vanishes The perf_event__synthesize_threads routine synthesizes all the existing threads in the system, because we don't have any kernel facilities to ask for PERF_RECORD_{FORK,MMAP,COMM} for existing threads. It was returning an error as soon as one thread couldn't be synthesized, which is a bit extreme when, for instance, a forkish workload is running, like a kernel compile. Cc: David Ahern Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Mike Galbraith Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-i7oas1eodpoer2bx38fwyasv@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/event.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c index 0ae444ef1429..ca9ca285406a 100644 --- a/tools/perf/util/event.c +++ b/tools/perf/util/event.c @@ -405,16 +405,15 @@ int perf_event__synthesize_threads(struct perf_tool *tool, if (*end) /* only interested in proper numerical dirents */ continue; - - if (__event__synthesize_thread(comm_event, mmap_event, pid, 1, - process, tool, machine) != 0) { - err = -1; - goto out_closedir; - } + /* + * We may race with exiting thread, so don't stop just because + * one thread couldn't be synthesized. + */ + __event__synthesize_thread(comm_event, mmap_event, pid, 1, + process, tool, machine); } err = 0; -out_closedir: closedir(proc); out_free_mmap: free(mmap_event); -- 2.34.1