On Thu, May 26, 2011 at 8:05 PM, KAMEZAWA Hiroyuki
[off-list ref] wrote:

On Fri, 27 May 2011 11:48:37 +0900
KAMEZAWA Hiroyuki [off-list ref] wrote:

quoted

On Thu, 26 May 2011 18:49:26 -0700
Ying Han [off-list ref] wrote:

quoted

quoted

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.

Yes, i have that changed in my previous testing

So, how do you enabled async_control ?

$ echo 1 >/dev/cgroup/memory/D/memory.async_control

?

--Ying

Thanks,
-Kame

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