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Message-ID: <20140710121419.GM29639@cmpxchg.org> Date: Thu, 10 Jul 2014 08:14:19 -0400 From: Johannes Weiner <hannes@...xchg.org> To: Mel Gorman <mgorman@...e.de> 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 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? :-) 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> -- 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/
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