From: "Li, Ming Chun" <macli@brc.ubc.ca>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-mm@kvack.org
Subject: Re: [patch 5/4] mm: document is_page_cache_freeable()
Date: Wed, 22 Jul 2009 14:55:12 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.1.00.0907221447190.24706@mail.selltech.ca> (raw)
In-Reply-To: <alpine.DEB.1.10.0907221500440.29748@gentwo.org>
On Wed, 22 Jul 2009, Christoph Lameter wrote:
>
> > static inline int is_page_cache_freeable(struct page *page)
> > {
> > + /*
> > + * A freeable page cache page is referenced only by the caller
> > + * that isolated the page, the page cache itself and
>
> The page cache "itself"? This is the radix tree reference right?
>
I think you are right. I had trouble understanding this function, So I
looked into it and found out the call path:
add_to_page_cache_locked
-> page_cache_get
-> atomic_inc(&page->_count)
Please correct me if I am wrong.
Vincent Li
Biomedical Research Center
University of British Columbia
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next prev parent reply other threads:[~2009-07-22 21:35 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-21 8:56 [patch 1/4] mm: drop unneeded double negations Johannes Weiner
2009-07-21 8:56 ` [patch 2/4] mm: introduce page_lru_type() Johannes Weiner
2009-07-22 1:52 ` Minchan Kim
2009-07-22 9:07 ` Johannes Weiner
2009-07-22 12:37 ` Minchan Kim
2009-07-22 16:01 ` Rik van Riel
2009-07-21 8:56 ` [patch 3/4] mm: return boolean from page_is_file_cache() Johannes Weiner
2009-07-21 8:56 ` [patch 4/4] mm: return boolean from page_has_private() Johannes Weiner
2009-07-22 16:49 ` Christoph Lameter
2009-07-22 17:50 ` Johannes Weiner
2009-07-22 17:54 ` [patch 5/4] mm: document is_page_cache_freeable() Johannes Weiner
2009-07-22 19:02 ` Christoph Lameter
2009-07-22 21:55 ` Li, Ming Chun [this message]
2009-07-22 22:10 ` Johannes Weiner
2009-07-22 23:51 ` Li, Ming Chun
2009-07-22 23:58 ` Christoph Lameter
2009-07-21 9:33 ` [patch 1/4] mm: drop unneeded double negations Mel Gorman
2009-07-21 11:18 ` Johannes Weiner
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