]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
define page_file_cache() function
authorRik van Riel <riel@redhat.com>
Sun, 19 Oct 2008 03:26:30 +0000 (20:26 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 20 Oct 2008 15:50:25 +0000 (08:50 -0700)
commitb2e185384f534781fd22f5ce170b2ad26f97df70
tree3096b8250302c5a9f71b1b5122345f7cf62606cc
parent68a22394c286a2daf06ee8d65d8835f738faefa5
define page_file_cache() function

Define page_file_cache() function to answer the question:
is page backed by a file?

Originally part of Rik van Riel's split-lru patch.  Extracted to make
available for other, independent reclaim patches.

Moved inline function to linux/mm_inline.h where it will be needed by
subsequent "split LRU" and "noreclaim" patches.

Unfortunately this needs to use a page flag, since the PG_swapbacked state
needs to be preserved all the way to the point where the page is last
removed from the LRU.  Trying to derive the status from other info in the
page resulted in wrong VM statistics in earlier split VM patchsets.

The total number of page flags in use on a 32 bit machine after this patch
is 19.

[akpm@linux-foundation.org: fix up out-of-order merge fallout]
[hugh@veritas.com: splitlru: shmem_getpage SetPageSwapBacked sooner[
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: MinChan Kim <minchan.kim@gmail.com>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/mm_inline.h
include/linux/page-flags.h
mm/memory.c
mm/migrate.c
mm/page_alloc.c
mm/shmem.c
mm/swap_state.c