linux-kernel - Re: [PATCH 1/3] balancenuma: add stats for huge pmd numa faults

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Message-ID: <20121124130419.GA8218@suse.de>
Date:	Sat, 24 Nov 2012 13:04:19 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Hillf Danton <dhillf@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] balancenuma: add stats for huge pmd numa faults

On Sat, Nov 24, 2012 at 12:17:03PM +0800, Hillf Danton wrote:
> A thp contributes 512 times more than a regular page to numa fault stats,
> so deserves its own vm event counter. THP migration is also accounted.
> 

I agree and mentioned it needed fixing. I did not create a new counter
but I properly account for PGMIGRATE_SUCCESS and PGMIGRATE_FAIL now. I
did not create a new NUMA_PAGE_MIGRATE counter because I didn't feel it
was necessary. Instead I just do this

        count_vm_events(PGMIGRATE_SUCCESS, HPAGE_PMD_NR);
        count_vm_numa_events(NUMA_PAGE_MIGRATE, HPAGE_PMD_NR);

> [A duplicated computation of page node idx is cleaned up]
> 

Got it. Thanks

-- 
Mel Gorman
SUSE Labs
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