linux-kernel - Re: [PATCH] add extra free kbytes tunable

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Message-ID: <alpine.LNX.2.00.1303011431290.9961@eggly.anvils>
Date:	Fri, 1 Mar 2013 14:33:38 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Simon Jeons <simon.jeons@...il.com>
cc:	Johannes Weiner <hannes@...xchg.org>,
	dormando <dormando@...ia.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Seiji Aguchi <seiji.aguchi@....com>,
	Satoru Moriya <satoru.moriya@....com>,
	Randy Dunlap <rdunlap@...otime.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"lwoodman@...hat.com" <lwoodman@...hat.com>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH] add extra free kbytes tunable

On Fri, 1 Mar 2013, Simon Jeons wrote:
> On 03/01/2013 05:22 PM, Simon Jeons wrote:
> > On 02/23/2013 01:56 AM, Johannes Weiner wrote:
> > > Mapped file pages have to get scanned twice before they are reclaimed
> > > because we don't have enough usage information after the first scan.
> > 
> > It seems that just VM_EXEC mapped file pages are protected.
> > Issue in page reclaim subsystem:
> > static inline int page_is_file_cache(struct page *page)
> > {
> >     return !PageSwapBacked(page);
> > }
> > AFAIK, PG_swapbacked is set if anonymous page added to swap cache, and be
> > cleaned if removed from swap cache. So anonymous pages which are reclaimed
> > and add to swap cache won't have this flag, then they will be treated as
> 
> s/are/aren't

PG_swapbacked != PG_swapcache
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