linux-kernel - Re: [PATCH 29/34] mm, page_alloc: remove fair zone allocation policy

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20160712181843.GE7821@cmpxchg.org>
Date:	Tue, 12 Jul 2016 14:18:43 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Mel Gorman <mgorman@...hsingularity.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>, Rik van Riel <riel@...riel.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Minchan Kim <minchan@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 29/34] mm, page_alloc: remove fair zone allocation policy

On Fri, Jul 08, 2016 at 10:35:05AM +0100, Mel Gorman wrote:
> The fair zone allocation policy interleaves allocation requests between
> zones to avoid an age inversion problem whereby new pages are reclaimed to
> balance a zone.  Reclaim is now node-based so this should no longer be an
> issue and the fair zone allocation policy is not free.  This patch removes
> it.
> 
> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>

It's indeed no longer needed with a single set of LRUs on each NUMA
node. I'm glad this wart is finally going. Thanks Mel.

Acked-by: Johannes Weiner <hannes@...xchg.org>