linux-kernel - Re: [patch 3/3] mm: page_alloc: fair zone allocator policy

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Message-ID: <51F9E4A6.2090909@redhat.com>
Date:	Thu, 01 Aug 2013 00:31:34 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Minchan Kim <minchan@...nel.org>
CC:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 3/3] mm: page_alloc: fair zone allocator policy

On 07/31/2013 10:56 PM, Minchan Kim wrote:

> Yes, it's not really slow path because it could return to normal status
> without calling significant slow functions by reset batchcount of
> prepare_slowpath.
>
> I think it's tradeoff and I am biased your approach although we would
> lose a little performance because fair aging would recover the loss by
> fastpath's overhead. But who knows? Someone has a concern.
>
> So we should mention about such problems.

If the atomic operation in the fast path turns out to be a problem,
I suspect we may be able to fix it by using per-cpu counters, and
consolidating those every once in a while.

However, it may be good to see whether there is a problem in the
first place, before adding complexity.

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