Commit-ID: e5af02261668350b43eb7381648930bde8e872f7
Gitweb: http://git.kernel.org/tip/e5af02261668350b43eb7381648930bde8e872f7
Author: Anton Blanchard <anton@xxxxxxxxx>
AuthorDate: Fri, 27 Nov 2009 13:28:20 +1100
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Fri, 27 Nov 2009 06:21:57 +0100
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@xxxxxxxxx>
Acked-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: msb@xxxxxxxxxx
LKML-Reference: <20091127022820.GU32182@kryten>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
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 d4e8417..0c642d5 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;
--
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