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Don't trigger softlockup detector on network fs blocked tasks

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Pulling the ethernet cable on a 2.6.27-rc system with NFS mounts
currently leads to an ongoing flood of soft lockup detector backtraces
for all tasks blocked on the NFS mounts when the hickup takes
longer than 120s.

I don't think NFS problems should be all that noisy.

Luckily there's a reasonably easy way to distingush this case.

Don't report task softlockup warnings for tasks in TASK_KILLABLE
state, which is used by the network file systems.

I believe this patch is a 2.6.27 candidate.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andi Kleen 2008-08-29 20:06:23 +02:00 committed by Linus Torvalds
parent b460947211
commit 316d9679f3
1 changed files with 4 additions and 0 deletions
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4
kernel/softlockup.c
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@ -180,6 +180,10 @@ static void check_hung_task(struct task_struct *t, unsigned long now)
if (t->flags & PF_FROZEN)
return;
/* Don't check for tasks waiting on network file systems like NFS */
if (t->state & TASK_KILLABLE)
return;
if (switch_count != t->last_switch_count || !t->last_switch_timestamp) {
t->last_switch_count = switch_count;
t->last_switch_timestamp = now;