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

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

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

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.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