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Subject[patch] 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.

Cc: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: David Rientjes <rientjes@google.com>
---
mm/oom_kill.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -297,6 +297,8 @@ 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",

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