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Date: Wed, 4 Nov 2009 09:36:59 +0900 From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> To: Andrea Arcangeli <aarcange@...hat.com> Cc: Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>, linux-mm@...ck.org, Marcelo Tosatti <mtosatti@...hat.com>, Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>, Izik Eidus <ieidus@...hat.com>, Hugh Dickins <hugh.dickins@...cali.co.uk>, Nick Piggin <npiggin@...e.de>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org Subject: Re: RFC: Transparent Hugepage support On Tue, 3 Nov 2009 11:55:43 +0100 Andrea Arcangeli <aarcange@...hat.com> wrote: > On Fri, Oct 30, 2009 at 09:40:37AM +0900, KAMEZAWA Hiroyuki wrote: > > Ah, please keep CONFIG_TRANSPARENT_HUGEPAGE for a while. > > Now, memcg don't handle hugetlbfs because it's special and cannot be freed by > > the kernel, only users can free it. But this new transparent-hugepage seems to > > be designed as that the kernel can free it for memory reclaiming. > > So, I'd like to handle this in memcg transparently. > > > > But it seems I need several changes to support this new rule. > > I'm glad if this new huge page depends on !CONFIG_CGROUP_MEM_RES_CTRL for a > > while. > > Yeah the accounting (not just memcg) should be checked.. I didn't pay > too much attention to stats at this point. > > But we want to fix it fast instead of making the two options mutually > exclusive.. Where are the pages de-accounted when they are freed? It's de-accounted at page_remove_rmap() in typical case of Anon. But swap-cache/bacthed-uncarhge related part is complicated, maybe. ...because of me ;( Okay, I don't request !CONFIG_CGROUP_MEM_RES_CTRL, I'm glad if you CC me. > Accounting seems to require just two one liners > calling mem_cgroup_newpage_charge. Yes, maybe so. Thanks, -Kame -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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