linux-kernel - Re: [PATCH 3/4] mm: vmscan: Evaluate the watermarks against the correct classzone

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Message-ID: <BANLkTini5rmyX_7wnAx8SA4Zw-wn21K9GQ@mail.gmail.com>
Date:	Wed, 29 Jun 2011 08:23:20 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pádraig Brady <P@...igbrady.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Colin King <colin.king@...onical.com>,
	Andrew Lutomirski <luto@....edu>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] mm: vmscan: Evaluate the watermarks against the
 correct classzone

On Fri, Jun 24, 2011 at 11:44 PM, Mel Gorman <mgorman@...e.de> wrote:
> When deciding if kswapd is sleeping prematurely, the classzone is
> taken into account but this is different to what balance_pgdat() and
> the allocator are doing. Specifically, the DMA zone will be checked
> based on the classzone used when waking kswapd which could be for a
> GFP_KERNEL or GFP_HIGHMEM request. The lowmem reserve limit kicks in,
> the watermark is not met and kswapd thinks its sleeping prematurely
> keeping kswapd awake in error.
>
> Reported-and-tested-by: Pádraig Brady <P@...igBrady.com>
> Signed-off-by: Mel Gorman <mgorman@...e.de>
Reviewed-by: Minchan Kim <minchan.kim@...il.com>

-- 
Kind regards,
Minchan Kim
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