linux-kernel - Re: [PATCH] mm, show_mem: Remove SHOW_MEM_FILTER_PAGE

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Message-ID: <alpine.DEB.2.02.1312031541240.5946@chino.kir.corp.google.com>
Date:	Tue, 3 Dec 2013 15:41:38 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Mel Gorman <mgorman@...e.de>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Russell King <linux@....linux.org.uk>,
	James Bottomley <jejb@...isc-linux.org>,
	linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
	linux-parisc@...r.kernel.org, Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm, show_mem: Remove SHOW_MEM_FILTER_PAGE_COUNT

On Tue, 3 Dec 2013, Mel Gorman wrote:

> Commit 4b59e6c4 (mm, show_mem: suppress page counts in non-blockable
> contexts) introduced SHOW_MEM_FILTER_PAGE_COUNT to suppress PFN walks
> on large memory machines. Commit c78e9363 (mm: do not walk all of system
> memory during show_mem) avoided a PFN walk in the generic show_mem helper
> which removes the requirement for SHOW_MEM_FILTER_PAGE_COUNT in that case.
> 
> This patch removes PFN walkers from the arch-specific implementations that
> report on a per-node or per-zone granularity. ARM and unicore32 still do
> a PFN walk as they report memory usage on each bank which is a much finer
> granularity where the debugging information may still be of use. As the
> remaining arches doing PFN walks have relatively small amounts of memory,
> this patch simply removes SHOW_MEM_FILTER_PAGE_COUNT.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Acked-by: David Rientjes <rientjes@...gle.com>

Thanks!
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