On Sun 23-11-14 13:51:31, Tetsuo Handa wrote: > >From 0c6d4e0ac9fc5964fdd09849c99e4f6497b7a37e Mon Sep 17 00:00:00 2001 > From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> > Date: Sun, 23 Nov 2014 13:40:20 +0900 > Subject: [PATCH 3/5] mm: Remember ongoing memory allocation status. > > When a stall by memory allocation problem occurs, printing how long > a thread was blocked for memory allocation will be useful. Why tracepoints are not suitable for this debugging? > This patch allows remembering how many jiffies was spent for ongoing > __alloc_pages_nodemask() and reading it by printing backtrace and by > analyzing vmcore. __alloc_pages_nodemask is a hotpath of the allocation and it is not really acceptable to add debugging stuff there which will have only very limited usage. [...] -- Michal Hocko SUSE Labs -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>