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memcg: add mem_cgroup_cancel_charge()

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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>
This commit is contained in:
Daisuke Nishimura 2009-12-15 16:47:10 -08:00 committed by Linus Torvalds
parent d8046582d5
commit a3032a2c15
1 changed files with 18 additions and 20 deletions
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38
mm/memcontrol.c
View file

@ -1499,6 +1499,21 @@ nomem:
return -ENOMEM;
}
/*
* 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
@ -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