Messages in this thread | | | Date | Wed, 29 Feb 2012 03:02:46 +0100 | From | Johannes Weiner <> | Subject | Re: [patch 2/2] mm: memcg: count pte references from every member of the reclaimed hierarchy |
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On Wed, Feb 29, 2012 at 09:39:46AM +0900, KAMEZAWA Hiroyuki wrote: > On Tue, 28 Feb 2012 15:14:49 +0100 > Johannes Weiner <hannes@cmpxchg.org> wrote: > > --- a/mm/vmscan.c > > +++ b/mm/vmscan.c > > @@ -708,7 +708,8 @@ static enum page_references page_check_references(struct page *page, > > int referenced_ptes, referenced_page; > > unsigned long vm_flags; > > > > - referenced_ptes = page_referenced(page, 1, mz->mem_cgroup, &vm_flags); > > + referenced_ptes = page_referenced(page, 1, sc->target_mem_cgroup, > > + &vm_flags); > > > I'm sorry if I don't understand the codes... !sc->target_mem_cgroup case is handled ?
Yes, but it's not obvious from the diff alone. page_referenced() does this:
/* * If we are reclaiming on behalf of a cgroup, skip * counting on behalf of references from different * cgroups */ if (memcg && !mm_match_cgroup(vma->vm_mm, memcg)) continue;
As a result, !sc->target_mem_cgroup -- global reclaim -- will never ignore references, or put differently, respect references from all memcgs, which is what we want.
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