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| author | Anton Blanchard <anton@samba.org> | 2009-11-27 13:28:20 +1100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-11-27 06:21:57 +0100 |
| commit | e5af02261668350b43eb7381648930bde8e872f7 (patch) | |
| tree | cf8a99b24b8584c57f011f8dca157da971f6a139 /kernel/hung_task.c | |
| parent | a8a8a669ea13d792296737505adc43ccacf3a648 (diff) | |
| download | lwn-e5af02261668350b43eb7381648930bde8e872f7.tar.gz lwn-e5af02261668350b43eb7381648930bde8e872f7.zip | |
softlockup: Fix hung_task_check_count sysctl
I'm seeing spikes of up to 0.5ms in khungtaskd on a large
machine. To reduce this source of jitter I tried setting
hung_task_check_count to 0:
# echo 0 > /proc/sys/kernel/hung_task_check_count
which didn't have the intended response. Change to a post
increment of max_count, so a value of 0 means check 0 tasks.
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: msb@google.com
LKML-Reference: <20091127022820.GU32182@kryten>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/hung_task.c')
| -rw-r--r-- | kernel/hung_task.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/hung_task.c b/kernel/hung_task.c index d4e841747400..0c642d51aac2 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -144,7 +144,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout) rcu_read_lock(); do_each_thread(g, t) { - if (!--max_count) + if (!max_count--) goto unlock; if (!--batch_count) { batch_count = HUNG_TASK_BATCHING; |