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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2010-10-27 15:33:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-27 18:03:10 -0700
commit26174efd42100eefac67732c0c12f41a205fa335 (patch)
tree81a7d758a3fcfd755e9e94ee7f66854133c281cf /mm
parent1489ebad8b5b20300562f634f279cb9c435fd90b (diff)
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memcg: generic filestat update interface
This patch extracts the core logic from mem_cgroup_update_file_mapped() as mem_cgroup_update_file_stat() and adds a wrapper. As a planned future update, memory cgroup has to count dirty pages to implement dirty_ratio/limit. And more, the number of dirty pages is required to kick flusher thread to start writeback. (Now, no kick.) This patch is preparation for it and makes other statistics implementation clearer. Just a clean up. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Reviewed-by: Greg Thelen <gthelen@google.com> Cc: 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')
-rw-r--r--mm/memcontrol.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 52840adae62..9a99cfaf0a1 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1591,7 +1591,8 @@ bool mem_cgroup_handle_oom(struct mem_cgroup *mem, gfp_t mask)
* small, we check MEM_CGROUP_ON_MOVE percpu value and detect there are
* possibility of race condition. If there is, we take a lock.
*/
-void mem_cgroup_update_file_mapped(struct page *page, int val)
+
+static void mem_cgroup_update_file_stat(struct page *page, int idx, int val)
{
struct mem_cgroup *mem;
struct page_cgroup *pc = lookup_page_cgroup(page);
@@ -1613,13 +1614,18 @@ void mem_cgroup_update_file_mapped(struct page *page, int val)
if (!mem || !PageCgroupUsed(pc))
goto out;
}
- if (val > 0) {
- this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
- SetPageCgroupFileMapped(pc);
- } else {
- this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
- if (!page_mapped(page)) /* for race between dec->inc counter */
+
+ this_cpu_add(mem->stat->count[idx], val);
+
+ switch (idx) {
+ case MEM_CGROUP_STAT_FILE_MAPPED:
+ if (val > 0)
+ SetPageCgroupFileMapped(pc);
+ else if (!page_mapped(page))
ClearPageCgroupFileMapped(pc);
+ break;
+ default:
+ BUG();
}
out:
@@ -1629,6 +1635,11 @@ out:
return;
}
+void mem_cgroup_update_file_mapped(struct page *page, int val)
+{
+ mem_cgroup_update_file_stat(page, MEM_CGROUP_STAT_FILE_MAPPED, val);
+}
+
/*
* size of first charge trial. "32" comes from vmscan.c's magic value.
* TODO: maybe necessary to use big numbers in big irons.