On Fri, 27 May 2011 11:48:37 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote: > On Thu, 26 May 2011 18:49:26 -0700 > Ying Han <yinghan@xxxxxxxxxx> wrote: > > Hmm.. I noticed a very strange behavior on a simple test w/ the patch set. > > > > Test: > > I created a 4g memcg and start doing cat. Then the memcg being OOM > > killed as soon as it reaches its hard_limit. We shouldn't hit OOM even > > w/o async-reclaim. > > > > Again, I will read through the patch. But like to post the test result first. > > > > $ echo $$ >/dev/cgroup/memory/A/tasks > > $ cat /dev/cgroup/memory/A/memory.limit_in_bytes > > 4294967296 > > > > $ time cat /export/hdc3/dd_A/tf0 > /dev/zero > > Killed > > > > real 0m53.565s > > user 0m0.061s > > sys 0m4.814s > > > > Hmm, what I see is > == > root@bluextal kamezawa]# ls -l test/1G > -rw-rw-r--. 1 kamezawa kamezawa 1053261824 May 13 13:58 test/1G > [root@bluextal kamezawa]# mkdir /cgroup/memory/A > [root@bluextal kamezawa]# echo 0 > /cgroup/memory/A/tasks > [root@bluextal kamezawa]# echo 300M > /cgroup/memory/A/memory.limit_in_bytes > [root@bluextal kamezawa]# echo 1 > /cgroup/memory/A/memory.async_control > [root@bluextal kamezawa]# cat test/1G > /dev/null > [root@bluextal kamezawa]# cat /cgroup/memory/A/memory.reclaim_stat > recent_scan_success_ratio 83 > limit_scan_pages 82 > limit_freed_pages 49 > limit_elapsed_ns 242507 > soft_scan_pages 0 > soft_freed_pages 0 > soft_elapsed_ns 0 > margin_scan_pages 218630 > margin_freed_pages 181598 > margin_elapsed_ns 117466604 > [root@bluextal kamezawa]# > == > > I'll turn off swapaccount and try again. > A bug found....I added memory.async_control file to memsw.....file set by mistake. Then, async_control cannot be enabled when swapaccount=0. I'll fix that. So, how do you enabled async_control ? Thanks, -Kame -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx 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>