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Message-ID: <20140407233511.GO4407@cmpxchg.org> Date: Mon, 7 Apr 2014 19:35:11 -0400 From: Johannes Weiner <hannes@...xchg.org> To: Mel Gorman <mgorman@...e.de> Cc: Andrew Morton <akpm@...ux-foundation.org>, Robert Haas <robertmhaas@...il.com>, Josh Berkus <josh@...iodbs.com>, Andres Freund <andres@...quadrant.com>, Christoph Lameter <cl@...ux.com>, Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/2] mm: Disable zone_reclaim_mode by default On Mon, Apr 07, 2014 at 11:34:27PM +0100, Mel Gorman wrote: > zone_reclaim_mode causes processes to prefer reclaiming memory from local > node instead of spilling over to other nodes. This made sense initially when > NUMA machines were almost exclusively HPC and the workload was partitioned > into nodes. The NUMA penalties were sufficiently high to justify reclaiming > the memory. On current machines and workloads it is often the case that > zone_reclaim_mode destroys performance but not all users know how to detect > this. Favour the common case and disable it by default. Users that are > sophisticated enough to know they need zone_reclaim_mode will detect it. > > Signed-off-by: Mel Gorman <mgorman@...e.de> 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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