Commit e5af0226 authored by Anton Blanchard's avatar Anton Blanchard Committed by Ingo Molnar
Browse files

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: default avatarAnton Blanchard <anton@samba.org>
Acked-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Cc: msb@google.com
LKML-Reference: <20091127022820.GU32182@kryten>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent a8a8a669
......@@ -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;
......
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