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>
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