linux-kernel - Re: [patch 02/10] fs: cachefiles: use add_to_page_cache

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Message-ID: <20140209173418.GH4407@cmpxchg.org>
Date:	Sun, 9 Feb 2014 12:34:18 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	Rafael Aquini <aquini@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Bob Liu <bob.liu@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	Greg Thelen <gthelen@...gle.com>,
	Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Luigi Semenzato <semenzato@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Metin Doslu <metin@...usdata.com>,
	Michel Lespinasse <walken@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Ozgun Erdogan <ozgun@...usdata.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	Ryan Mallon <rmallon@...il.com>, Tejun Heo <tj@...nel.org>,
	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 02/10] fs: cachefiles: use add_to_page_cache_lru()

On Sat, Feb 08, 2014 at 09:43:35AM -0200, Rafael Aquini wrote:
> On Mon, Feb 03, 2014 at 07:53:34PM -0500, Johannes Weiner wrote:
> > This code used to have its own lru cache pagevec up until a0b8cab3
> > ("mm: remove lru parameter from __pagevec_lru_add and remove parts of
> > pagevec API").  Now it's just add_to_page_cache() followed by
> > lru_cache_add(), might as well use add_to_page_cache_lru() directly.
> >
> 
> Just a heads-up, here: take a look at https://lkml.org/lkml/2014/2/7/587

Ah, yes.  That patch replaced a private pagevec, which consumes the
references you pass in, with add_to_page_cache_lru(), which gets its
own references.

My patch changes

    add_to_page_cache()
    lru_cache_add()

to

    add_to_page_cache_lru()
      add_to_page_cache()
      lru_cache_add()

so the refcounting does not change for the caller.

Thanks for pointing it out, though, it never hurts to double check
stuff like that.
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