linux-kernel - [PATCH 1/5] oom: improve dump

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Date:	Fri, 20 May 2011 17:01:38 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	kosaki.motohiro@...fujitsu.com
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, caiqian@...hat.com, rientjes@...gle.com,
	hughd@...gle.com, kamezawa.hiroyu@...fujitsu.com,
	minchan.kim@...il.com, oleg@...hat.com
Subject: [PATCH 1/5] oom: improve dump_tasks() show items

Recently, oom internal logic was dramatically changed. Thus
dump_tasks() doesn't show enough information for bug report
analysis. it has some meaningless items and don't have some
oom score related items.

This patch adapt displaying fields to new oom logic.

details
--------
removed: pid (we always kill process. don't need thread id),
         signal->oom_adj (we no longer uses it internally)
	 cpu (we no longer uses it)
added:  ppid (we often kill sacrifice child process)
        swap (it's accounted)
modify: RSS (account mm->nr_ptes too)

<old>
[ pid ]   uid  tgid total_vm      rss cpu oom_adj oom_score_adj name
[ 3886]     0  3886     2893      441   1       0             0 bash
[ 3905]     0  3905    29361    25833   0       0             0 memtoy

<new>
[   pid]   ppid   uid total_vm      rss     swap score_adj name
[   417]      1     0     3298       12      184     -1000 udevd
[   830]      1     0     1776       11       16         0 system-setup-ke
[   973]      1     0    61179       35      116         0 rsyslogd
[  1733]   1732     0  1052337   958582        0         0 memtoy

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 mm/oom_kill.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index f52e85c..43d32ae 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -355,7 +355,7 @@ static void dump_tasks(const struct mem_cgroup *mem, const nodemask_t *nodemask)
 	struct task_struct *p;
 	struct task_struct *task;

-	pr_info("[ pid ]   uid  tgid total_vm      rss cpu oom_adj oom_score_adj name\n");
+	pr_info("[   pid]   ppid   uid total_vm      rss     swap score_adj name\n");
 	for_each_process(p) {
 		if (oom_unkillable_task(p, mem, nodemask))
 			continue;
@@ -370,11 +370,14 @@ static void dump_tasks(const struct mem_cgroup *mem, const nodemask_t *nodemask)
 			continue;
 		}

-		pr_info("[%5d] %5d %5d %8lu %8lu %3u     %3d         %5d %s\n",
-			task->pid, task_uid(task), task->tgid,
-			task->mm->total_vm, get_mm_rss(task->mm),
-			task_cpu(task), task->signal->oom_adj,
-			task->signal->oom_score_adj, task->comm);
+		pr_info("[%6d] %6d %5d %8lu %8lu %8lu %9d %s\n",
+			task_tgid_nr(task), task_tgid_nr(task->real_parent),
+			task_uid(task),
+			task->mm->total_vm,
+			get_mm_rss(task->mm) + p->mm->nr_ptes,
+			get_mm_counter(p->mm, MM_SWAPENTS),
+			task->signal->oom_score_adj,
+			task->comm);
 		task_unlock(task);
 	}
 }
-- 
1.7.3.1



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