linux-kernel - Re: [PATCH 5/6] mm: page_alloc: Abort fair zone allocation policy when remotes nodes are encountered

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 for Android: free password hash cracker in your pocket

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

Date:	Thu, 10 Jul 2014 13:44:07 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-FSDevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 5/6] mm: page_alloc: Abort fair zone allocation policy
 when remotes nodes are encountered

On Thu, Jul 10, 2014 at 08:14:19AM -0400, Johannes Weiner wrote:
> On Wed, Jul 09, 2014 at 09:13:07AM +0100, Mel Gorman wrote:
> > The purpose of numa_zonelist_order=zone is to preserve lower zones
> > for use with 32-bit devices. If locality is preferred then the
> > numa_zonelist_order=node policy should be used. Unfortunately, the fair
> > zone allocation policy overrides this by skipping zones on remote nodes
> > until the lower one is found. While this makes sense from a page aging
> > and performance perspective, it breaks the expected zonelist policy. This
> > patch restores the expected behaviour for zone-list ordering.
> > 
> > Signed-off-by: Mel Gorman <mgorman@...e.de>
> 
> 32-bit NUMA? :-)

I'm tempted to just say "it can go on fire" but realistically speaking
they should be configured to use node ordering. I was very tempted to
always force node ordering but I didn't have good data on how often lowmem
allocations are required on NUMA machines.

> Anyway, this change also cuts down the fair pass
> overhead on bigger NUMA machines, so I'm all for it.
> 
> Acked-by: Johannes Weiner <hannes@...xchg.org>

Thanks for the reviews!

-- 
Mel Gorman
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/