aboutsummaryrefslogtreecommitdiff
path: root/kernel/hung_task.c
diff options
context:
space:
mode:
authorAnton Blanchard <anton@samba.org>2009-11-27 13:28:20 +1100
committerIngo Molnar <mingo@elte.hu>2009-11-27 06:21:57 +0100
commite5af02261668350b43eb7381648930bde8e872f7 (patch)
treecf8a99b24b8584c57f011f8dca157da971f6a139 /kernel/hung_task.c
parenta8a8a669ea13d792296737505adc43ccacf3a648 (diff)
downloadlinux-linaro-stable-e5af02261668350b43eb7381648930bde8e872f7.tar.gz
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.c2
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;