linux-kernel - Re: [PATCH 3.2.0-rc1 2/3] MM hook for page allocation and release

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Message-ID: <CAOJsxLF706VeThxqWostJr84N_8q8UXoQzxGmMXj8mpgTLCagg@mail.gmail.com>
Date:	Thu, 5 Jan 2012 14:49:42 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	leonid.moiseichuk@...ia.com
Cc:	kamezawa.hiroyu@...fujitsu.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, cesarb@...arb.net, emunson@...bm.net,
	aarcange@...hat.com, riel@...hat.com, mel@....ul.ie,
	rientjes@...gle.com, dima@...roid.com, gregkh@...e.de,
	rebecca@...roid.com, san@...gle.com, akpm@...ux-foundation.org,
	vesa.jaaskelainen@...ia.com
Subject: Re: [PATCH 3.2.0-rc1 2/3] MM hook for page allocation and release

On Thu, Jan 5, 2012 at 1:26 PM,  <leonid.moiseichuk@...ia.com> wrote:
> I agree that hooking alloc_pages is ugly way. So alternatives I see:
>
> - shrinkers (as e.g. Android OOM used) but shrink_slab called only from
> try_to_free_pages only if we are on slow reclaim path on memory allocation,
> so it cannot be used for e.g. 75% memory tracking or when pages released to
> notify user space that we are OK. But according to easy to use it will be the
> best approach.
>
> - memcg-kind of changes like mem_cgroup_newpage_charge/uncharge_page but
> without blocking decision making logic. Seems to me more changes. Threshold
> currently in memcg set 128 pages per CPU, that is quite often for level
> tracking needs.
>
> - tracking situation using timer? Maybe not due to will impact battery.

Can we hook into mm/vmscan.c and mm/page-writeback.c for this?

                                Pekka
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