linux-kernel - Re: [PATCH 07/28] mm, page_alloc: Avoid unnecessary zone lookups during pageblock operations

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Message-ID: <571F5125.6050502@suse.cz>
Date:	Tue, 26 Apr 2016 13:29:41 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Mel Gorman <mgorman@...hsingularity.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jesper Dangaard Brouer <brouer@...hat.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/28] mm, page_alloc: Avoid unnecessary zone lookups
 during pageblock operations

On 04/15/2016 10:58 AM, Mel Gorman wrote:
> Pageblocks have an associated bitmap to store migrate types and whether
> the pageblock should be skipped during compaction. The bitmap may be
> associated with a memory section or a zone but the zone is looked up
> unconditionally. The compiler should optimise this away automatically so
> this is a cosmetic patch only in many cases.
>
> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>

Acked-by: Vlastimil Babka <vbabka@...e.cz>