linux-kernel - Re: [patch 03/19] define page_file

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Message-Id: <20080109132615.8fbaef05.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 9 Jan 2008 13:26:15 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Christoph Lameter <clameter@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Lee Schermerhorn <lee.schermerhorn@...com>
Subject: Re: [patch 03/19] define page_file_cache() function

On Tue, 8 Jan 2008 17:28:56 -0500
Rik van Riel <riel@...hat.com> wrote:

> On Tue, 8 Jan 2008 14:18:40 -0800 (PST)
> Christoph Lameter <clameter@....com> wrote:
> 
> > On Tue, 8 Jan 2008, Rik van Riel wrote:
> > 
> > > Define page_file_cache() function to answer the question:
> > > 	is page backed by a file?
> > 
> > > +static inline int page_file_cache(struct page *page)
> > > +{
> > > +	if (PageSwapBacked(page))
> > > +		return 0;
> > 
> > Could we call this PageNotFileBacked or so? PageSwapBacked is true for 
> > pages that are RAM based. Its a bit confusing.
> 
> PageNotFileBacked confuses me a little, since shared memory segments live
> in tmpfs and are kinda sorta file backed, but go to swap instead of to a
> filesystem when there is memory pressure.
> 
How about PageIsNotCache() ? :)

When a page is a cache, there is an original data somewhere and can be dropped
out.

Thanks,
-Kame

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