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Date: Fri, 6 Jun 2008 12:01:46 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: Keika Kobayashi <kobayashi.kk@...s.nec.co.jp>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
akpm@...ux-foundation.org, nagar@...son.ibm.com, balbir@...ibm.com,
sekharan@...ibm.com, kosaki.motohiro@...fujitsu.com
Subject: Re: [PATCH 0/3 v2] per-task-delay-accounting: add memory reclaim
delay
On Thu, 5 Jun 2008 16:27:59 -0700
Keika Kobayashi <kobayashi.kk@...s.nec.co.jp> wrote:
> Hi.
>
> This is v2 of accounting memory reclaim patch series.
> Thanks to Kosaki-san, Kamezawa-san, Andrew for comments and advice!
> These patches were fixed about the following.
>
> Against: next-20080605
>
> 1) Change Log
>
> o Add accounting memory reclaim delay from memcgroup.
> For accounting both global and cgroup memory reclaim,
> accounting point was moved from try_to_free_pages() to do_try_to_free_pages.
>
> o Drop the patch regarding /proc export for memory reclaim delay.
> Because it seems that two separate ways to report are not necessary,
> this patch series supports only NETLINK and doesn't add a field to /proc/<pid>/stat.
>
>
Thanks, I like this set.
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 2) Confirm the fix regarding memcgroup.
>
> o Previous patch can't catch memory reclaim delay from memcgroup.
>
> $ echo 10M > /cgroups/0/memory.limit_in_bytes
>
> $ ls -s test.dat
> 500496 test.dat
>
> $ time tar cvf test.tar test.dat
> real 0m21.957s
> user 0m0.032s
> sys 0m2.348s
>
> $ ./delayget -d -p <pid>
> CPU count real total virtual total delay total
> 2441 2288143000 2438256954 22371958
> IO count delay total
> 2444 18745251314
> SWAP count delay total
> 0 0
> RECLAIM count delay total
> 0 0
>
> o Current patch can catch memory reclaim delay from memcgroup.
>
> $ echo 10M > /cgroups/0/memory.limit_in_bytes
>
> $ ls -s test.dat
> 500496 test.dat
>
> $ time tar cvf test.tar test.dat
> real 0m22.563s
> user 0m0.028s
> sys 0m2.440s
>
> $ ./delayget -d -p <pid>
> CPU count real total virtual total delay total
> 2640 2456153500 2478353004 28366219
> IO count delay total
> 2628 19894214188
> SWAP count delay total
> 0 0
> RECLAIM count delay total
> 6600 10682486085
>
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