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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> -- All rights reversed -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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