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| author | Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> | 2009-12-15 16:47:10 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-16 07:20:07 -0800 |
| commit | a3032a2c15c6967f9f0c0c28375b1a5c833a3112 (patch) | |
| tree | 32d279856032fd9d84ebd5d6746b2bd382baaac9 /mm/memcontrol.c | |
| parent | d8046582d5ee24448800e71c6933fdb6813aa062 (diff) | |
| download | linux-stable-a3032a2c15c6967f9f0c0c28375b1a5c833a3112.tar.gz linux-stable-a3032a2c15c6967f9f0c0c28375b1a5c833a3112.tar.bz2 linux-stable-a3032a2c15c6967f9f0c0c28375b1a5c833a3112.zip | |
memcg: add mem_cgroup_cancel_charge()
There are some places calling both res_counter_uncharge() and css_put() to
cancel the charge and the refcnt we have got by mem_cgroup_tyr_charge().
This patch introduces mem_cgroup_cancel_charge() and call it in those
places.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Reviewed-by: Balbir Singh <balbir@linux.vnet.ibm.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 | 38 |
1 files changed, 18 insertions, 20 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 0b3efb843a87..2d6b4a912a6d 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1500,6 +1500,21 @@ nomem: } /* + * Somemtimes we have to undo a charge we got by try_charge(). + * This function is for that and do uncharge, put css's refcnt. + * gotten by try_charge(). + */ +static void mem_cgroup_cancel_charge(struct mem_cgroup *mem) +{ + if (!mem_cgroup_is_root(mem)) { + res_counter_uncharge(&mem->res, PAGE_SIZE); + if (do_swap_account) + res_counter_uncharge(&mem->memsw, PAGE_SIZE); + } + css_put(&mem->css); +} + +/* * A helper function to get mem_cgroup from ID. must be called under * rcu_read_lock(). The caller must check css_is_removed() or some if * it's concern. (dropping refcnt from swap can be called against removed @@ -1565,12 +1580,7 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *mem, lock_page_cgroup(pc); if (unlikely(PageCgroupUsed(pc))) { unlock_page_cgroup(pc); - if (!mem_cgroup_is_root(mem)) { - res_counter_uncharge(&mem->res, PAGE_SIZE); - if (do_swap_account) - res_counter_uncharge(&mem->memsw, PAGE_SIZE); - } - css_put(&mem->css); + mem_cgroup_cancel_charge(mem); return; } @@ -1734,14 +1744,7 @@ static int mem_cgroup_move_parent(struct page_cgroup *pc, cancel: put_page(page); uncharge: - /* drop extra refcnt by try_charge() */ - css_put(&parent->css); - /* uncharge if move fails */ - if (!mem_cgroup_is_root(parent)) { - res_counter_uncharge(&parent->res, PAGE_SIZE); - if (do_swap_account) - res_counter_uncharge(&parent->memsw, PAGE_SIZE); - } + mem_cgroup_cancel_charge(parent); return ret; } @@ -1958,12 +1961,7 @@ void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *mem) return; if (!mem) return; - if (!mem_cgroup_is_root(mem)) { - res_counter_uncharge(&mem->res, PAGE_SIZE); - if (do_swap_account) - res_counter_uncharge(&mem->memsw, PAGE_SIZE); - } - css_put(&mem->css); + mem_cgroup_cancel_charge(mem); } static void |