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authorRik van Riel <riel@redhat.com>2008-10-18 23:26:32 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-20 11:50:25 -0400
commit4f98a2fee8acdb4ac84545df98cccecfd130f8db (patch)
tree035a2937f4c3e2f7b4269412041c073ac646937c /include/linux/vmstat.h
parentb2e185384f534781fd22f5ce170b2ad26f97df70 (diff)
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 'include/linux/vmstat.h')
-rw-r--r--include/linux/vmstat.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 58334d439516..ff5179f2b153 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -159,6 +159,16 @@ static inline unsigned long zone_page_state(struct zone *zone,
159 return x; 159 return x;
160} 160}
161 161
162extern unsigned long global_lru_pages(void);
163
164static inline unsigned long zone_lru_pages(struct zone *zone)
165{
166 return (zone_page_state(zone, NR_ACTIVE_ANON)
167 + zone_page_state(zone, NR_ACTIVE_FILE)
168 + zone_page_state(zone, NR_INACTIVE_ANON)
169 + zone_page_state(zone, NR_INACTIVE_FILE));
170}
171
162#ifdef CONFIG_NUMA 172#ifdef CONFIG_NUMA
163/* 173/*
164 * Determine the per node value of a stat item. This function 174 * Determine the per node value of a stat item. This function