linux-kernel - Re: [PATCH 3/3] Provide control over unmapped pages (v4)

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Message-Id: <20110128171744.b7b37703.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 28 Jan 2011 17:17:44 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	Minchan Kim <minchan.kim@...il.com>, linux-mm@...ck.org,
	akpm@...ux-foundation.org, npiggin@...nel.dk, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, kosaki.motohiro@...fujitsu.com,
	cl@...ux.com
Subject: Re: [PATCH 3/3] Provide control over unmapped pages (v4)

On Fri, 28 Jan 2011 13:49:28 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2011-01-28 16:56:05]:
 
> > BTW, it seems this doesn't work when some apps use huge shmem.
> > How to handle the issue ?
> >
> 
> Could you elaborate further? 
> 
==
static inline unsigned long zone_unmapped_file_pages(struct zone *zone)
{
        unsigned long file_mapped = zone_page_state(zone, NR_FILE_MAPPED);
        unsigned long file_lru = zone_page_state(zone, NR_INACTIVE_FILE) +
                zone_page_state(zone, NR_ACTIVE_FILE);

        /*
         * It's possible for there to be more file mapped pages than
         * accounted for by the pages on the file LRU lists because
         * tmpfs pages accounted for as ANON can also be FILE_MAPPED
         */
        return (file_lru > file_mapped) ? (file_lru - file_mapped) : 0;
}
==

Did you read ?

Thanks,
-Kame

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