linux-kernel - Re: [PATCH] Apply memory policies to top two highest zones when highest zone is ZONE

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Message-Id: <1186083711.5040.74.camel@localhost>
Date:	Thu, 02 Aug 2007 15:41:51 -0400
From:	Lee Schermerhorn <Lee.Schermerhorn@...com>
To:	Mel Gorman <mel@...net.ie>
Cc:	akpm@...ux-foundation.org, clameter@....com,
	kamezawa.hiroyu@...fujitsu.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Apply memory policies to top two highest zones when
	highest zone is ZONE_MOVABLE

On Thu, 2007-08-02 at 18:21 +0100, Mel Gorman wrote:
> The NUMA layer only supports NUMA policies for the highest zone. When
> ZONE_MOVABLE is configured with kernelcore=, the the highest zone becomes
> ZONE_MOVABLE. The result is that policies are only applied to allocations
> like anonymous pages and page cache allocated from ZONE_MOVABLE when the
> zone is used.
> 
> This patch applies policies to the two highest zones when the highest zone
> is ZONE_MOVABLE. As ZONE_MOVABLE consists of pages from the highest "real"
> zone, it's always functionally equivalent.
> 
> The patch has been tested on a variety of machines both NUMA and non-NUMA
> covering x86, x86_64 and ppc64. No abnormal results were seen in kernbench,
> tbench, dbench or hackbench. It passes regression tests from the numactl
> package with and without kernelcore= once numactl tests are patched to
> wait for vmstat counters to update.
> 
> Signed-off-by: Mel Gorman <mel@....ul.ie>


And an ia_64 NUMA platform with some ad hoc, interactive functional
testing with memtoy and an overnight run of a usex job mix.  Job mix
included a 32-way kernel build, several povray tracing apps, IO tests,
sequential and random vm fault tests and a number of 'bin' tests that
simulate a half a dozen crazed monkeys pounding away at keyboards
entering surprisingly error-free commands.  All of these loop until
stopped or the system hangs/crashes--which it didn't...


Acked-by:  Lee Schermerhorn <lee.schermerhorn@...com>
Tested-by:  Lee Schermerhorn <lee.schermerhorn@...com>



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