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memcg: clean up move charge 

This patch cleans up move charge code by:

- define functions to handle pte for each types, and make
  is_target_pte_for_mc() cleaner.

- instead of checking the MOVE_CHARGE_TYPE_ANON bit, define a function
  that checks the bit.

Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.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 2010-05-26 14:42:38 -07:00 committed by Linus Torvalds
parent 3c11ecf448
commit 90254a6583
1 changed files with 59 additions and 37 deletions
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96
mm/memcontrol.c
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@ -266,6 +266,12 @@ static struct move_charge_struct {
.waitq = __WAIT_QUEUE_HEAD_INITIALIZER(mc.waitq),
};
static bool move_anon(void)
{
return test_bit(MOVE_CHARGE_TYPE_ANON,
&mc.to->move_charge_at_immigrate);
}
/*
* Maximum loops in mem_cgroup_hierarchical_reclaim(), used for soft
* limit reclaim to prevent infinite loops, if they ever occur.
@ -4162,6 +4168,50 @@ enum mc_target_type {
MC_TARGET_SWAP,
};
static struct page *mc_handle_present_pte(struct vm_area_struct *vma,
unsigned long addr, pte_t ptent)
{
struct page *page = vm_normal_page(vma, addr, ptent);
if (!page || !page_mapped(page))
return NULL;
if (PageAnon(page)) {
/* we don't move shared anon */
if (!move_anon() || page_mapcount(page) > 2)
return NULL;
} else
/*
* TODO: We don't move charges of file(including shmem/tmpfs)
* pages for now.
*/
return NULL;
if (!get_page_unless_zero(page))
return NULL;
return page;
}
static struct page *mc_handle_swap_pte(struct vm_area_struct *vma,
unsigned long addr, pte_t ptent, swp_entry_t *entry)
{
int usage_count;
struct page *page = NULL;
swp_entry_t ent = pte_to_swp_entry(ptent);
if (!move_anon() || non_swap_entry(ent))
return NULL;
usage_count = mem_cgroup_count_swap_user(ent, &page);
if (usage_count > 1) { /* we don't move shared anon */
if (page)
put_page(page);
return NULL;
}
if (do_swap_account)
entry->val = ent.val;
return page;
}
static int is_target_pte_for_mc(struct vm_area_struct *vma,
unsigned long addr, pte_t ptent, union mc_target *target)
{
@ -4169,43 +4219,15 @@ static int is_target_pte_for_mc(struct vm_area_struct *vma,
struct page_cgroup *pc;
int ret = 0;
swp_entry_t ent = { .val = 0 };
int usage_count = 0;
bool move_anon = test_bit(MOVE_CHARGE_TYPE_ANON,
&mc.to->move_charge_at_immigrate);
if (!pte_present(ptent)) {
/* TODO: handle swap of shmes/tmpfs */
if (pte_none(ptent) || pte_file(ptent))
return 0;
else if (is_swap_pte(ptent)) {
ent = pte_to_swp_entry(ptent);
if (!move_anon || non_swap_entry(ent))
return 0;
usage_count = mem_cgroup_count_swap_user(ent, &page);
}
} else {
page = vm_normal_page(vma, addr, ptent);
if (!page || !page_mapped(page))
return 0;
/*
* TODO: We don't move charges of file(including shmem/tmpfs)
* pages for now.
*/
if (!move_anon || !PageAnon(page))
return 0;
if (!get_page_unless_zero(page))
return 0;
usage_count = page_mapcount(page);
}
if (usage_count > 1) {
/*
* TODO: We don't move charges of shared(used by multiple
* processes) pages for now.
*/
if (page)
put_page(page);
if (pte_present(ptent))
page = mc_handle_present_pte(vma, addr, ptent);
else if (is_swap_pte(ptent))
page = mc_handle_swap_pte(vma, addr, ptent, &ent);
/* TODO: handle swap of shmes/tmpfs */
if (!page && !ent.val)
return 0;
}
if (page) {
pc = lookup_page_cgroup(page);
/*
@ -4221,8 +4243,8 @@ static int is_target_pte_for_mc(struct vm_area_struct *vma,
if (!ret || !target)
put_page(page);
}
/* throught */
if (ent.val && do_swap_account && !ret &&
/* There is a swap entry and a page doesn't exist or isn't charged */
if (ent.val && !ret &&
css_id(&mc.from->css) == lookup_swap_cgroup(ent)) {
ret = MC_TARGET_SWAP;
if (target)