* KAMEZAWA Hiroyuki [off-list ref] [2011-01-28 17:17:44]:

On Fri, 28 Jan 2011 13:49:28 +0530
Balbir Singh [off-list ref] wrote:

quoted

* KAMEZAWA Hiroyuki [off-list ref] [2011-01-28 16:56:05]:

quoted

quoted

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;
}

Yes, I did :) The word huge confused me. I am not sure if there is an
easy accounting fix for this one, though given the approximate nature
of the control, I am not sure it would matter very much. But you do
have a very good point.

-- 
	Three Cheers,
	Balbir

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