linux-kernel - Re: [patch] vmscan: rename sc.may_swap to may

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Date:	Tue, 10 Feb 2009 19:00:27 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	MinChan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Johannes Weiner <hannes@...xchg.org>,
	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] vmscan: rename sc.may_swap to may_unmap

> On Tue, Feb 10, 2009 at 4:43 AM, Johannes Weiner <hannes@...xchg.org> wrote:
> > sc.may_swap does not only influence reclaiming of anon pages but pages
> > mapped into pagetables in general, which also includes mapped file
> > pages.
> >
> > From shrink_page_list():
> >
> >                if (!sc->may_swap && page_mapped(page))
> >                        goto keep_locked;
> >
> > For anon pages, this makes sense as they are always mapped and
> > reclaiming them always requires swapping.
> >
> > But mapped file pages are skipped here as well and it has nothing to
> > do with swapping.
> >
> > The real effect of the knob is whether mapped pages are unmapped and
> > reclaimed or not.  Rename it to `may_unmap' to have its name match its
> > actual meaning more precisely.
> >
> > Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> > ---
> >  mm/vmscan.c |   20 ++++++++++----------
> >  1 file changed, 10 insertions(+), 10 deletions(-)
> 
> It looks good to me. :)
> 
> Reviewed-by: MinChan Kim <minchan.kim@...il.com>

me too :)

	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>



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