Re: [PATCH V8] Eliminate task stack trace duplication

[Rik van Riel]

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@xxxxxxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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