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memcgroup: tidy up mem_cgroup_charge_common

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Tidy up mem_cgroup_charge_common before extending it.  Adjust some comments,
but mainly clean up its loop: I've an aversion to loops full of continues,
then a break or a goto at the bottom.  And the is_atomic test should be on the
__GFP_WAIT bit, not GFP_ATOMIC bits.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2008-02-07 00:14:19 -08:00 committed by Linus Torvalds
parent ac44d354d5
commit 3be91277e7
1 changed files with 15 additions and 29 deletions
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44
mm/memcontrol.c
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@ -345,23 +345,22 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
goto done;
}
}
unlock_page_cgroup(page);
pc = kzalloc(sizeof(struct page_cgroup), gfp_mask);
if (pc == NULL)
goto err;
rcu_read_lock();
/*
* We always charge the cgroup the mm_struct belongs to
* the mm_struct's mem_cgroup changes on task migration if the
* We always charge the cgroup the mm_struct belongs to.
* The mm_struct's mem_cgroup changes on task migration if the
* thread group leader migrates. It's possible that mm is not
* set, if so charge the init_mm (happens for pagecache usage).
*/
if (!mm)
mm = &init_mm;
rcu_read_lock();
mem = rcu_dereference(mm->mem_cgroup);
/*
* For every charge from the cgroup, increment reference
@ -375,12 +374,8 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
* the cgroup limit.
*/
while (res_counter_charge(&mem->res, PAGE_SIZE)) {
bool is_atomic = gfp_mask & GFP_ATOMIC;
/*
* We cannot reclaim under GFP_ATOMIC, fail the charge
*/
if (is_atomic)
goto noreclaim;
if (!(gfp_mask & __GFP_WAIT))
goto out;
if (try_to_free_mem_cgroup_pages(mem, gfp_mask))
continue;
@ -394,23 +389,12 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
*/
if (res_counter_check_under_limit(&mem->res))
continue;
/*
* Since we control both RSS and cache, we end up with a
* very interesting scenario where we end up reclaiming
* memory (essentially RSS), since the memory is pushed
* to swap cache, we eventually end up adding those
* pages back to our list. Hence we give ourselves a
* few chances before we fail
*/
else if (nr_retries--) {
congestion_wait(WRITE, HZ/10);
continue;
if (!nr_retries--) {
mem_cgroup_out_of_memory(mem, gfp_mask);
goto out;
}
noreclaim:
css_put(&mem->css);
if (!is_atomic)
mem_cgroup_out_of_memory(mem, GFP_KERNEL);
goto free_pc;
congestion_wait(WRITE, HZ/10);
}
atomic_set(&pc->ref_cnt, 1);
@ -419,10 +403,11 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
pc->flags = 0;
if (ctype == MEM_CGROUP_CHARGE_TYPE_CACHE)
pc->flags |= PAGE_CGROUP_FLAG_CACHE;
if (page_cgroup_assign_new_page_cgroup(page, pc)) {
/*
* an another charge is added to this page already.
* we do take lock_page_cgroup(page) again and read
* Another charge has been added to this page already.
* We take lock_page_cgroup(page) again and read
* page->cgroup, increment refcnt.... just retry is OK.
*/
res_counter_uncharge(&mem->res, PAGE_SIZE);
@ -437,7 +422,8 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
done:
return 0;
free_pc:
out:
css_put(&mem->css);
kfree(pc);
err:
return -ENOMEM;