From: Johannes Weiner <hannes@cmpxchg.org>
To: Mel Gorman <mgorman@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Robert Haas <robertmhaas@gmail.com>,
Josh Berkus <josh@agliodbs.com>,
Andres Freund <andres@2ndquadrant.com>,
Christoph Lameter <cl@linux.com>, Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] mm: Disable zone_reclaim_mode by default
Date: Mon, 7 Apr 2014 19:35:11 -0400 [thread overview]
Message-ID: <20140407233511.GO4407@cmpxchg.org> (raw)
In-Reply-To: <1396910068-11637-2-git-send-email-mgorman@suse.de>
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@suse.de>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
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WARNING: multiple messages have this Message-ID (diff)
From: Johannes Weiner <hannes@cmpxchg.org>
To: Mel Gorman <mgorman@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Robert Haas <robertmhaas@gmail.com>,
Josh Berkus <josh@agliodbs.com>,
Andres Freund <andres@2ndquadrant.com>,
Christoph Lameter <cl@linux.com>, Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] mm: Disable zone_reclaim_mode by default
Date: Mon, 7 Apr 2014 19:35:11 -0400 [thread overview]
Message-ID: <20140407233511.GO4407@cmpxchg.org> (raw)
In-Reply-To: <1396910068-11637-2-git-send-email-mgorman@suse.de>
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@suse.de>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
next prev parent reply other threads:[~2014-04-07 23:35 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-07 22:34 [PATCH 0/2] Disable zone_reclaim_mode by default Mel Gorman
2014-04-07 22:34 ` Mel Gorman
2014-04-07 22:34 ` [PATCH 1/2] mm: " Mel Gorman
2014-04-07 22:34 ` Mel Gorman
2014-04-07 23:35 ` Johannes Weiner [this message]
2014-04-07 23:35 ` Johannes Weiner
2014-04-08 1:17 ` Zhang Yanfei
2014-04-08 1:17 ` Zhang Yanfei
2014-04-08 7:14 ` Andres Freund
2014-04-08 7:14 ` Andres Freund
2014-04-08 14:14 ` Christoph Lameter
2014-04-08 14:14 ` Christoph Lameter
2014-04-08 14:47 ` Mel Gorman
2014-04-08 14:47 ` Mel Gorman
2014-04-07 22:34 ` [PATCH 2/2] mm: page_alloc: Do not cache reclaim distances Mel Gorman
2014-04-07 22:34 ` Mel Gorman
2014-04-07 23:36 ` Johannes Weiner
2014-04-07 23:36 ` Johannes Weiner
2014-04-08 1:17 ` Zhang Yanfei
2014-04-08 1:17 ` Zhang Yanfei
2014-04-08 7:26 ` [PATCH 0/2] Disable zone_reclaim_mode by default Vlastimil Babka
2014-04-08 7:26 ` Vlastimil Babka
2014-04-08 14:17 ` Christoph Lameter
2014-04-08 14:17 ` Christoph Lameter
2014-04-08 14:26 ` Andres Freund
2014-04-08 14:26 ` Andres Freund
[not found] ` <WM!ea1193ee171854a74828ee30c859d97ff2ce66405ffa3a0b8c31a1233c6a0b55530cdf3cbfcd989c0ec18fef1d533f81!@asav-3.01.com>
2014-04-08 14:46 ` Josh Berkus
2014-04-08 14:46 ` Josh Berkus
2014-04-08 19:53 ` Robert Haas
2014-04-08 19:53 ` Robert Haas
[not found] ` <WM!55d2a092da9f6180473043487a4eb612ae8195f78d2ffdd83f673ed5cb2cb9659cf61e0c8d5bae23f5c914057bcd2ee4!@asav-3.01.com>
2014-04-08 19:56 ` Josh Berkus
2014-04-08 19:56 ` Josh Berkus
2014-04-09 13:08 ` Mel Gorman
2014-04-09 13:08 ` Mel Gorman
2014-04-08 22:58 ` Christoph Lameter
2014-04-08 22:58 ` Christoph Lameter
2014-04-08 23:26 ` Mel Gorman
2014-04-08 23:26 ` Mel Gorman
2014-04-10 10:26 ` Jeremy Harris
2014-04-10 10:26 ` Jeremy Harris
2014-04-18 15:49 ` Michal Hocko
2014-04-18 15:49 ` Michal Hocko
2014-04-18 16:44 ` Christoph Lameter
2014-04-18 16:44 ` Christoph Lameter
-- strict thread matches above, loose matches on Subject: below --
2014-04-08 8:22 [PATCH 0/2] Disable zone_reclaim_mode by default v2 Mel Gorman
2014-04-08 8:22 ` [PATCH 1/2] mm: Disable zone_reclaim_mode by default Mel Gorman
2014-04-08 8:22 ` Mel Gorman
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