linux-kernel - Re: [PATCH 3/3][RFC] swsusp: shrink file cache first

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Message-ID: <20090206233714.GA3687@cmpxchg.org>
Date:	Sat, 7 Feb 2009 00:37:14 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	MinChan Kim <minchan.kim@...il.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Rik van Riel <riel@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 3/3][RFC] swsusp: shrink file cache first

On Sat, Feb 07, 2009 at 02:15:21AM +0900, MinChan Kim wrote:
> >>> Grr, you are right.
> >>> I agree, currently may_swap doesn't control swap out or not.
> >>> so I think we should change it correct name ;)
> >>
> >> Agreed.  What do you think about the following patch?
> >
> > As for me, I can't agree with you.
> > There are two kinds of file-mapped pages.
> >
> > 1. file-mapped and dirty page.
> > 2. file-mapped and no-dirty page
> >
> > Both pages are not swapped.
> > File-mapped and dirty page is synced with original file
> > File-mapped and no-dirty page is just discarded with viewpoint of reclaim.
> >
> > So, may_swap is just related to anon-pages
> > Thus, I think may_swap is reasonable.
> > How about you ?
> 
> Sorry for misunderstood your point.
> It would be better to remain more detaily for git log ?
> 
> 'may_swap' applies not only to anon pages but to mapped file pages as
> well. 'may_swap' term is sometime used for 'swap', sometime used for
> 'sync|discard'.
> In case of anon pages, 'may_swap' determines whether pages were swapout or not.
> but In case of mapped file pages, it determines whether pages are
> synced or discarded. so, 'may_swap' is rather awkward. Rename it to
> 'may_unmap' which is the actual meaning.
> 
> If you find wrong word and sentence, Please, fix it. :)

Cool, thanks.  I will resend an updated version soon with your
changelog text.  And on top of the two fixlets of this series which
Andrew already picked up.

	Hannes
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