From: Christoph Lameter <cl@linux.com>
To: Mel Gorman <mgorman@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Minchan Kim <minchan.kim@gmail.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] mm: page allocator: Initialise ZLC for first zone eligible for zone_reclaim
Date: Mon, 18 Jul 2011 16:54:10 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1107181651000.31576@router.home> (raw)
In-Reply-To: <20110718211325.GC5349@suse.de>
On Mon, 18 Jul 2011, Mel Gorman wrote:
> > We may be able to simplify the function by:
> >
> > 1. Checking for the special case that the first zone is ok and that we do
> > not want to call zlc_setup before we get to the loop.
> >
> > 2. Do the zlc_setup() before the loop.
> >
> > 3. Remove the zlc_setup() code as you did from the loop as well as the
> > checks for zlc_active. zlc_active becomes not necessary since a zlc
> > is always available when we go through the loop.
> >
>
> That initial test will involve duplication of things like the cpuset and
> no watermarks check just to place the zlc_setup() in a different place.
> I might be missing your point but it seems like the gain would be
> marginal. Fancy posting a patch?
Looked at it for some time. Would have to create a new function for the
watermark checks, the call to buffer_rmqueue and the marking of a zone as
full. After that the goto mess could be unraveled. But I am out of time
for today.
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next prev parent reply other threads:[~2011-07-18 21:54 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-15 15:08 [PATCH 0/2] Reduce frequency of stalls due to zone_reclaim() on NUMA v2r1 Mel Gorman
2011-07-15 15:08 ` [PATCH 1/2] mm: page allocator: Initialise ZLC for first zone eligible for zone_reclaim Mel Gorman
2011-07-18 14:56 ` Christoph Lameter
2011-07-18 16:05 ` Mel Gorman
2011-07-18 17:20 ` Christoph Lameter
2011-07-18 21:13 ` Mel Gorman
2011-07-18 21:54 ` Christoph Lameter [this message]
2011-07-19 14:01 ` Christoph Lameter
2011-07-20 18:08 ` Christoph Lameter
2011-07-20 19:18 ` Mel Gorman
2011-07-20 19:28 ` Christoph Lameter
2011-07-20 19:52 ` Christoph Lameter
2011-07-20 21:17 ` Christoph Lameter
2011-07-20 22:48 ` Mel Gorman
2011-07-21 15:24 ` Christoph Lameter
2011-07-15 15:09 ` [PATCH 2/2] mm: page allocator: Reconsider zones for allocation after direct reclaim Mel Gorman
2011-07-19 11:46 ` [PATCH] mm: page allocator: Reconsider zones for allocation after direct reclaim fix Mel Gorman
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