linux-kernel - Re: [RFC PATCH] No Reclaim LRU Infrastructure enhancement for memcgroup

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Date:	Thu, 29 May 2008 20:14:29 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	balbir@...ux.vnet.ibm.com
CC:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH] No Reclaim LRU Infrastructure enhancement for memcgroup

On 2008/05/29 11:30 +0900, Balbir Singh wrote:
> KOSAKI Motohiro wrote:
>> Hi
>>
>>> In my understanding, 2 checks we have to do.
>>>
>>> 1. When memcg finds PG_noreclaim page in its LRU, move it to noreclaim list of
>>>    memcg.
>>> 2. When PG_noreclaim page is moved back to generic LRU, memcg should move
>>>    it on its list. (we have to add a hook somewhere.)
>>>
>>> But this may break current 'loose' synchronization between global LRU and
>>> memcg's LRU. When PG_noreclaim page is put back into active/inactive LRU ?
>>>
>>> concerns are
>>> A. how to implement '2'
>> I tried to implement it today.
>> this patch is made against "[PATCH -mm 13/16] No Reclaim LRU Infrastructure"
>>
>>
>>> B. race condtions.
>> don't worry :)
>> it isn't big problem.
>>
>> global lru is reclaimbale and memcg lru is noreclaimable
>> 	-> we can repair at move lru of shrink_[in]active_page().
>>
>> global lru is noreclaimbale and memcg lru is reclaimable
>> 	-> we can repair mem_cgroup_isolate_pages()
>>
>>
> 
> I've tried these patches and I still get OOM killed. I'll investigate a bit more.
> 
> 

Hmm... I cannot reporoduce this problem.
When a process exceeds the limit of the group, swap is used as expected.

I tested 2.6.26-rc2-mm1 + splitlru-v8 + Kosaki-san's 3 patches
+ fix for shrink_active_list(attached).

I'm afraid, have you applied rvr-07.1-kosaki-memcg-shrink_list.patch
which Kosaki-san posted to [07/16] of this thread?


Thanks,
Daisuke Nishimura.

---
diff --git a/mm/vmscan.c b/mm/vmscan.c
index d58cb5e..6f9f764 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1153,6 +1153,7 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *
                __mod_zone_page_state(zone, NR_ACTIVE_ANON, -pgmoved);
        spin_unlock_irq(&zone->lru_lock);

+       pgmoved = 0;
        while (!list_empty(&l_hold)) {
                cond_resched();
                page = lru_to_page(&l_hold);
--
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