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mm: memcg: remove unneeded checks from newpage_charge()

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All callsites pass in freshly allocated pages and a valid mm.  As a
result, all checks pertaining to the page's mapcount, page->mapping or the
fallback to init_mm are unneeded.

Signed-off-by: Johannes Weiner <[email protected]>
Acked-by: KAMEZAWA Hiroyuki <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Hugh Dickins <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Johannes Weiner 2012-01-12 17:18:43 -08:00 • committed by Linus Torvalds
commit 7a0524cfc8
1 changed files with 4 additions and 12 deletions
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16
mm/memcontrol.c
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@ -2748,19 +2748,11 @@ int mem_cgroup_newpage_charge(struct page *page,
{
if (mem_cgroup_disabled())
return 0;
/*
* If already mapped, we don't have to account.
* If page cache, page->mapping has address_space.
* But page->mapping may have out-of-use anon_vma pointer,
* detecit it by PageAnon() check. newly-mapped-anon's page->mapping
* is NULL.
*/
if (page_mapped(page) || (page->mapping && !PageAnon(page)))
return 0;
if (unlikely(!mm))
mm = &init_mm;
VM_BUG_ON(page_mapped(page));
VM_BUG_ON(page->mapping && !PageAnon(page));
VM_BUG_ON(!mm);
return mem_cgroup_charge_common(page, mm, gfp_mask,
MEM_CGROUP_CHARGE_TYPE_MAPPED);
MEM_CGROUP_CHARGE_TYPE_MAPPED);
}
static void