Re: [PATCH] oom: add tracepoints for oom_score_adj
From: David Rientjes
Date: Tue Dec 06 2011 - 20:22:16 EST
On Wed, 7 Dec 2011, KAMEZAWA Hiroyuki wrote:
> From 28189e4622fd97324893a0b234183f64472a54d6 Mon Sep 17 00:00:00 2001
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> Date: Wed, 7 Dec 2011 09:58:16 +0900
> Subject: [PATCH] oom: trace point for oom_score_adj
>
> oom_score_adj is set to prevent a task from being killed by OOM-Killer.
> Some daemons sets this value and their children inerit it sometimes.
> Because inheritance of oom_score_adj is done automatically, users
> can be confused at seeing the value and finds it's hard to debug.
>
> This patch adds trace point for oom_score_adj. This adds 3 trace
> points. at
> - update oom_score_adj
> - fork()
> - rename task->comm(typically, exec())
>
> Outputs will be following.
> bash-2404 [006] 199.620841: oom_score_adj_update: task 2404[bash] updates oom_score_ad j=-1000
> bash-2404 [006] 205.861287: oom_score_adj_inherited: new_task=2442 oom_score_adj=-1000
> su-2442 [003] 205.861761: oom_score_task_rename: rename task 2442[bash] to [su] oom_ score_adj=-1000
> su-2442 [003] 205.866737: oom_score_adj_inherited: new_task=2444 oom_score_adj=-1000
> bash-2444 [007] 205.868136: oom_score_task_rename: rename task 2444[su] to [bash] oom_ score_adj=-1000
> bash-2444 [007] 205.870407: oom_score_adj_inherited: new_task=2445 oom_score_adj=-1000
> bash-2445 [001] 205.870975: oom_score_adj_inherited: new_task=2446 oom_score_adj=-1000
>
Little bit of whitespace damage there, but looks good in the code itself.
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Just minor alterations to the format of the tracepoints from the first
version, so carry over my
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
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