linux-kernel - Re: [PATCH/RFCv4 0/6] The Contiguous Memory Allocator framework

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Message-id: <op.vh0ud3rg7p4s8u@localhost>
Date:	Thu, 26 Aug 2010 03:28:41 +0200
From:	Michał Nazarewicz <m.nazarewicz@...sung.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Hans Verkuil <hverkuil@...all.nl>,
	Daniel Walker <dwalker@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Mel Gorman <mel@....ul.ie>,
	Pawel Osciak <p.osciak@...sung.com>,
	Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-mm@...ck.org, Kyungmin Park <kyungmin.park@...sung.com>,
	Zach Pfeffer <zpfeffer@...eaurora.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH/RFCv4 0/6] The Contiguous Memory Allocator framework

On Fri, 20 Aug 2010 15:15:10 +0200, Peter Zijlstra <peterz@...radead.org> wrote:
> So the idea is to grab a large chunk of memory at boot time and then
> later allow some device to use it?
>
> I'd much rather we'd improve the regular page allocator to be smarter
> about this. We recently added a lot of smarts to it like memory
> compaction, which allows large gobs of contiguous memory to be freed for
> things like huge pages.
>
> If you want guarantees you can free stuff, why not add constraints to
> the page allocation type and only allow MIGRATE_MOVABLE pages inside a
> certain region, those pages are easily freed/moved aside to satisfy
> large contiguous allocations.

I'm aware that grabbing a large chunk at boot time is a bit of waste of
space and because of it I'm hoping to came up with a way of reusing the
space when it's not used by CMA-aware devices.  My current idea was to
use it for easily discardable data (page cache?).

> Also, please remove --chain-reply-to from your git config. You're using
> 1.7 which should do the right thing (--no-chain-reply-to) by default.

OK.

-- 
Best regards,                                        _     _
| Humble Liege of Serenely Enlightened Majesty of  o' \,=./ `o
| Computer Science,  Michał "mina86" Nazarewicz       (o o)
+----[mina86*mina86.com]---[mina86*jabber.org]----ooO--(_)--Ooo--

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