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authorIngo Molnar <mingo@elte.hu>2009-05-17 11:24:08 +0200
committerIngo Molnar <mingo@elte.hu>2009-05-17 11:26:57 +0200
commit0203026b58b4299ba7281c0b4b417207c1f05d0e (patch)
tree02c9f3486544b0f7db1922f05cf12e6480eaf95f /kernel
parent856d56b9e5de650a64a6c41c17aaed702b55d578 (diff)
downloadlwn-0203026b58b4299ba7281c0b4b417207c1f05d0e.tar.gz
lwn-0203026b58b4299ba7281c0b4b417207c1f05d0e.zip
perf_counter: fix threaded task exit
Flushing counters in __exit_signal() with irqs disabled is not a good idea as perf_counter_exit_task() acquires mutexes. So flush it before acquiring the tasklist lock. (Note, we still need a fix for when the PID has been unhashed.) [ Impact: fix crash with inherited counters ] Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Srivatsa Vaddagiri <vatsa@in.ibm.com> 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.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 16d74f13a3e7..73affd35e76d 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -128,12 +128,6 @@ 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);
/*
@@ -183,6 +177,13 @@ repeat:
atomic_dec(&__task_cred(p)->user->processes);
proc_flush_task(p);
+
+ /*
+ * Flush inherited counters to the parent - before the parent
+ * gets woken up by child-exit notifications.
+ */
+ perf_counter_exit_task(p);
+
write_lock_irq(&tasklist_lock);
tracehook_finish_release_task(p);
__exit_signal(p);