linux-kernel - Re: [PATCH] mm: remove struct reclaim

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Message-ID: <4EC62E46.6080503@openvz.org>
Date:	Fri, 18 Nov 2011 14:07:02 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Dave Chinner <david@...morbit.com>
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>
Subject: Re: [PATCH] mm: remove struct reclaim_state

Dave Chinner wrote:
> On Fri, Nov 18, 2011 at 01:28:06PM +0300, Konstantin Khlebnikov wrote:
>> Memory reclaimer want to know how much pages was reclaimed during shrinking slabs.
>> Currently there is special struct reclaim_state with single counter and pointer from
>> task-struct. Let's store counter direcly on task struct and account freed pages
>> unconditionally. This will reduce stack usage and simplify code in reclaimer and slab.
>>
>> Logic in do_try_to_free_pages() is slightly changed, but this is ok.
>> Nobody calls shrink_slab() explicitly before do_try_to_free_pages(),
>
> Except for drop_slab() and shake_page()....

Indeed, but they do not care about accounting reclaimed pages and
they do not call do_try_to_free_pages() after all.

>
> Cheers,
>
> Dave.

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