vmscan: evict streaming IO first
commit9ff473b9a72942c5ac0ad35607cae28d8d59ed7a
authorRik van Riel <riel@redhat.com>
Tue, 2 Dec 2008 18:31:52 +0000 (2 10:31 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 2 Dec 2008 23:50:40 +0000 (2 15:50 -0800)
tree32a6eca5447abc95cf7fa8482d1e3f8237806621
parentf1d0b063d993527754f062c589b73f125024d216
vmscan: evict streaming IO first

Count the insertion of new pages in the statistics used to drive the
pageout scanning code.  This should help the kernel quickly evict
streaming file IO.

We count on the fact that new file pages start on the inactive file LRU
and new anonymous pages start on the active anon list.  This means
streaming file IO will increment the recent scanned file statistic, while
leaving the recent rotated file statistic alone, driving pageout scanning
to the file LRUs.

Pageout activity does its own list manipulation.

Signed-off-by: Rik van Riel <riel@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Tested-by: Gene Heskett <gene.heskett@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/swap.c