linux-kernel - Re: [PATCH V8] Eliminate task stack trace duplication

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Message-ID: <4F7F3CA9.1030500@redhat.com>
Date:	Fri, 06 Apr 2012 14:57:45 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Ying Han <yinghan@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V8] Eliminate task stack trace duplication

On 04/06/2012 02:45 PM, Ying Han wrote:
> The problem with small dmesg ring buffer like 512k is that only limited number
> of task traces will be logged. Sometimes we lose important information only
> because of too many duplicated stack traces. This problem occurs when dumping
> lots of stacks in a single operation, such as sysrq-T.
>
> This patch tries to reduce the duplication of task stack trace in the dump
> message by hashing the task stack. The hashtable is a 32k pre-allocated buffer
> during bootup. Each time if we find the identical task trace in the task stack,
> we dump only the pid of the task which has the task trace dumped. So it is easy
> to back track to the full stack with the pid.

> Signed-off-by: Ying Han<yinghan@...gle.com>

Acked-by: Rik van Riel <riel@...hat.com>

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