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author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-05-15 20:45:59 +0200 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-05-17 07:52:24 +0200 |
commit | 856d56b9e5de650a64a6c41c17aaed702b55d578 (patch) | |
tree | af2fcfe19f0ab27fa220216285e4703ecc7887e1 /kernel | |
parent | 8bc2095951517e2c74b8aeeca4685ddd6b16ed4b (diff) | |
download | kernel_samsung_tuna-856d56b9e5de650a64a6c41c17aaed702b55d578.zip kernel_samsung_tuna-856d56b9e5de650a64a6c41c17aaed702b55d578.tar.gz kernel_samsung_tuna-856d56b9e5de650a64a6c41c17aaed702b55d578.tar.bz2 |
perf_counter: Fix counter inheritance
Srivatsa Vaddagiri reported that a Java workload triggers this
warning in kernel/exit.c:
WARN_ON_ONCE(!list_empty(&tsk->perf_counter_ctx.counter_list));
Add the inherited counter propagation on self-detach, this could
cause counter leaks and incomplete stats in threaded code like
the below:
#include <pthread.h>
#include <unistd.h>
void *thread(void *arg)
{
sleep(5);
return NULL;
}
void main(void)
{
pthread_t thr;
pthread_create(&thr, NULL, thread, NULL);
}
Reported-by: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/exit.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 4741376..16d74f1 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -128,6 +128,12 @@ static void __exit_signal(struct task_struct *tsk) sig = NULL; /* Marker for below. */ } + /* + * Flush inherited counters to the parent - before the parent + * gets woken up by child-exit notifications. + */ + perf_counter_exit_task(tsk); + __unhash_process(tsk); /* |