linux-kernel - Re: [PATCH 4/4] mm: remove free_page

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Message-ID: <20120921124715.GD11157@csn.ul.ie>
Date:	Fri, 21 Sep 2012 13:47:15 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michel Lespinasse <walken@...gle.com>,
	Ying Han <yinghan@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] mm: remove free_page_mlock

On Tue, Sep 18, 2012 at 08:57:27PM -0700, Hugh Dickins wrote:
> We should not be seeing non-0 unevictable_pgs_mlockfreed any longer.
> So remove free_page_mlock() from the page freeing paths: __PG_MLOCKED
> is already in PAGE_FLAGS_CHECK_AT_FREE, so free_pages_check() will now
> be checking it, reporting "BUG: Bad page state" if it's ever found set.
> Comment UNEVICTABLE_MLOCKFREED and unevictable_pgs_mlockfreed always 0.
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>
> Cc: Mel Gorman <mel@....ul.ie>
> Cc: Rik van Riel <riel@...hat.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michel Lespinasse <walken@...gle.com>
> Cc: Ying Han <yinghan@...gle.com>

Like Johannes I think you should just drop the counter. I find it very
unlikely that there is a tool that depends on it existing because it's
very hard to draw any useful conclusions from its value unlikes like say
pgscan* or pgfault.

Acked-by: Mel Gorman <mel@....ul.ie>

Thanks Hugh.

-- 
Mel Gorman
SUSE Labs
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