linux-kernel - Re: [RFC PATCH 3/3] CMA: always treat free cma pages as non-free on watermark checking

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Message-ID: <xa1t1tw3x8d1.fsf@mina86.com>
Date:	Fri, 09 May 2014 08:46:50 -0700
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Laura Abbott <lauraa@...eaurora.org>,
	Minchan Kim <minchan@...nel.org>,
	Heesub Shin <heesub.shin@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/3] CMA: always treat free cma pages as non-free on watermark checking

On Wed, May 07 2014, Joonsoo Kim wrote:
> commit d95ea5d1('cma: fix watermark checking') introduces ALLOC_CMA flag
> for alloc flag and treats free cma pages as free pages if this flag is
> passed to watermark checking. Intention of that patch is that movable page
> allocation can be be handled from cma reserved region without starting
> kswapd. Now, previous patch changes the behaviour of allocator that
> movable allocation uses the page on cma reserved region aggressively,
> so this watermark hack isn't needed anymore. Therefore remove it.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Michal Nazarewicz <mina86@...a86.com>


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