++cc x86 people which I forgot this time .. --Ying On Fri, Apr 6, 2012 at 11:57 AM, Rik van Riel <riel@xxxxxxxxxx> wrote: > 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> > > -- > All rights reversed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>