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oom: do not dump task state for non thread group leaders
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>
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@ -295,6 +295,8 @@ static void dump_tasks(const struct mem_cgroup *mem)
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continue;
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if (mem && !task_in_mem_cgroup(p, mem))
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continue;
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if (!thread_group_leader(p))
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continue;
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task_lock(p);
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printk(KERN_INFO "[%5d] %5d %5d %8lu %8lu %3d %3d %s\n",
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