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oom: do not dump task state for non thread group leaders

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When /proc/sys/vm/oom_dump_tasks is enabled, it's only necessary to dump
task state information for thread group leaders.  The kernel log gets
quickly overwhelmed on machines with a massive number of threads by
dumping non-thread group leaders.

Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2008-11-06 12:53:29 -08:00 committed by Linus Torvalds
parent 953a64798d
commit b4416d2bea
1 changed files with 2 additions and 0 deletions
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mm/oom_kill.c
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@ -295,6 +295,8 @@ static void dump_tasks(const struct mem_cgroup *mem)
continue;
if (mem && !task_in_mem_cgroup(p, mem))
continue;
if (!thread_group_leader(p))
continue;
task_lock(p);
printk(KERN_INFO "[%5d] %5d %5d %8lu %8lu %3d %3d %s\n",