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softlockup: Fix hung_task_check_count sysctl

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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>
This commit is contained in:
Anton Blanchard 2009-11-27 13:28:20 +11:00 committed by Ingo Molnar
parent a8a8a669ea
commit e5af022616
1 changed files with 1 additions and 1 deletions
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2
kernel/hung_task.c
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@ -144,7 +144,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
rcu_read_lock(); rcu_read_lock();
do_each_thread(g, t) { do_each_thread(g, t) {
if (!--max_count) if (!max_count--)
goto unlock; goto unlock;
if (!--batch_count) { if (!--batch_count) {
batch_count = HUNG_TASK_BATCHING; batch_count = HUNG_TASK_BATCHING;