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| author | Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> | 2010-08-10 18:02:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-11 08:59:18 -0700 |
| commit | bd0d24bfe8a8f8d2400569740874a67d164d40a9 (patch) | |
| tree | 9d592f6566adacc3e8da3d2c06411a16b2d45763 /mm/memcontrol.c | |
| parent | 2bd9bb206b338888b226e70139a25a67d10007f0 (diff) | |
| download | linux-bd0d24bfe8a8f8d2400569740874a67d164d40a9.tar.bz2 | |
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.c | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 27981e705b0a..79a53f0f0cf5 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) { |