linux-kernel - Re: [PATCH v2 00/22] mm: lru

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Message-ID: <4F4646D6.6070900@openvz.org>
Date:	Thu, 23 Feb 2012 18:01:58 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Andi Kleen <andi@...stfloor.org>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hughd@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"tim.c.chen@...ux.intel.com" <tim.c.chen@...ux.intel.com>
Subject: Re: [PATCH v2 00/22] mm: lru_lock splitting

Andi Kleen wrote:
> On Wed, Feb 22, 2012 at 09:11:32AM +0400, Konstantin Khlebnikov wrote:
>> Andi Kleen wrote:
>>> Konstantin Khlebnikov<khlebnikov@...nvz.org>   writes:
>>>
>>> Konstantin,
>>>
>>>> There complete patch-set with my lru_lock splitting
>>>> plus all related preparations and cleanups rebased to next-20120210
>>>
>>> On large systems we're also seeing lock contention on the lru_lock
>>> without using memcgs. Any thoughts how this could be extended for this
>>> situation too?
>>
>> We can split lru_lock by pfn-based interleaving.
>> After all these cleanups it is very easy. I already have patch for this.
>
> Cool. If you send it can try it out on a large system.

See last patch in v3 patchset in lkml or in
git: https://github.com/koct9i/linux/commits/lruvec-v3

>
> This would split the LRU by pfn too, correct?

Of course, I don't see any problems with splitting large zone into some
independent pages subsets. But all sub-pages in huge-page should be in one lru,
that's why I use pfn-based interleaving.

>
> -Andi

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