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authorDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>2010-08-10 18:02:59 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-11 08:59:18 -0700
commitbd0d24bfe8a8f8d2400569740874a67d164d40a9 (patch)
tree9d592f6566adacc3e8da3d2c06411a16b2d45763 /mm/memcontrol.c
parent2bd9bb206b338888b226e70139a25a67d10007f0 (diff)
downloadvexpress-lsk-bd0d24bfe8a8f8d2400569740874a67d164d40a9.tar.gz
memcg: remove redundant code
- try_get_mem_cgroup_from_mm() calls rcu_read_lock/unlock by itself, so we don't have to call them in task_in_mem_cgroup(). - *mz is not used in __mem_cgroup_uncharge_common(). - we don't have to call lookup_page_cgroup() in mem_cgroup_end_migration() after we've cleared PCG_MIGRATION of @oldpage. - remove empty comment. - remove redundant empty line in mem_cgroup_cache_charge(). Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c10
1 files changed, 0 insertions, 10 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 27981e705b0..79a53f0f0cf 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -840,9 +840,7 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
struct mem_cgroup *curr = NULL;
task_lock(task);
- rcu_read_lock();
curr = try_get_mem_cgroup_from_mm(task->mm);
- rcu_read_unlock();
task_unlock(task);
if (!curr)
return 0;
@@ -2092,7 +2090,6 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
if (!(gfp_mask & __GFP_WAIT)) {
struct page_cgroup *pc;
-
pc = lookup_page_cgroup(page);
if (!pc)
return 0;
@@ -2286,7 +2283,6 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
{
struct page_cgroup *pc;
struct mem_cgroup *mem = NULL;
- struct mem_cgroup_per_zone *mz;
if (mem_cgroup_disabled())
return NULL;
@@ -2340,7 +2336,6 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
* special functions.
*/
- mz = page_cgroup_zoneinfo(pc);
unlock_page_cgroup(pc);
memcg_check_events(mem, page);
@@ -2652,11 +2647,8 @@ void mem_cgroup_end_migration(struct mem_cgroup *mem,
ClearPageCgroupMigration(pc);
unlock_page_cgroup(pc);
- if (unused != oldpage)
- pc = lookup_page_cgroup(unused);
__mem_cgroup_uncharge_common(unused, MEM_CGROUP_CHARGE_TYPE_FORCE);
- pc = lookup_page_cgroup(used);
/*
* If a page is a file cache, radix-tree replacement is very atomic
* and we can skip this check. When it was an Anon page, its mapcount
@@ -3800,8 +3792,6 @@ static int mem_cgroup_oom_control_read(struct cgroup *cgrp,
return 0;
}
-/*
- */
static int mem_cgroup_oom_control_write(struct cgroup *cgrp,
struct cftype *cft, u64 val)
{