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authorRik van Riel <riel@redhat.com>2008-10-18 20:26:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-20 08:50:25 -0700
commit4f98a2fee8acdb4ac84545df98cccecfd130f8db (patch)
tree035a2937f4c3e2f7b4269412041c073ac646937c /mm/filemap.c
parentb2e185384f534781fd22f5ce170b2ad26f97df70 (diff)
downloadconfigs-4f98a2fee8acdb4ac84545df98cccecfd130f8db.tar.gz
vmscan: split LRU lists into anon & file sets
Split the LRU lists in two, one set for pages that are backed by real file systems ("file") and one for pages that are backed by memory and swap ("anon"). The latter includes tmpfs. The advantage of doing this is that the VM will not have to scan over lots of anonymous pages (which we generally do not want to swap out), just to find the page cache pages that it should evict. This patch has the infrastructure and a basic policy to balance how much we scan the anon lists and how much we scan the file lists. The big policy changes are in separate patches. [lee.schermerhorn@hp.com: collect lru meminfo statistics from correct offset] [kosaki.motohiro@jp.fujitsu.com: prevent incorrect oom under split_lru] [kosaki.motohiro@jp.fujitsu.com: fix pagevec_move_tail() doesn't treat unevictable page] [hugh@veritas.com: memcg swapbacked pages active] [hugh@veritas.com: splitlru: BDI_CAP_SWAP_BACKED] [akpm@linux-foundation.org: fix /proc/vmstat units] [nishimura@mxp.nes.nec.co.jp: memcg: fix handling of shmem migration] [kosaki.motohiro@jp.fujitsu.com: adjust Quicklists field of /proc/meminfo] [kosaki.motohiro@jp.fujitsu.com: fix style issue of get_scan_ratio()] Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 903bf316912..a1ddd2557af 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -33,6 +33,7 @@
#include <linux/cpuset.h>
#include <linux/hardirq.h> /* for BUG_ON(!in_atomic()) only */
#include <linux/memcontrol.h>
+#include <linux/mm_inline.h> /* for page_is_file_cache() */
#include "internal.h"
/*
@@ -492,9 +493,24 @@ EXPORT_SYMBOL(add_to_page_cache_locked);
int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
pgoff_t offset, gfp_t gfp_mask)
{
- int ret = add_to_page_cache(page, mapping, offset, gfp_mask);
- if (ret == 0)
- lru_cache_add(page);
+ int ret;
+
+ /*
+ * Splice_read and readahead add shmem/tmpfs pages into the page cache
+ * before shmem_readpage has a chance to mark them as SwapBacked: they
+ * need to go on the active_anon lru below, and mem_cgroup_cache_charge
+ * (called in add_to_page_cache) needs to know where they're going too.
+ */
+ if (mapping_cap_swap_backed(mapping))
+ SetPageSwapBacked(page);
+
+ ret = add_to_page_cache(page, mapping, offset, gfp_mask);
+ if (ret == 0) {
+ if (page_is_file_cache(page))
+ lru_cache_add_file(page);
+ else
+ lru_cache_add_active_anon(page);
+ }
return ret;
}