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Date: Sun, 24 Apr 2016 13:46:27 +0800 From: Wincy Van <fanwenyi0529@...il.com> To: Andres Lagar-Cavilla <andreslc@...gle.com> Cc: Andrea Arcangeli <aarcange@...hat.com>, "Shi, Yang" <yang.shi@...aro.org>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Hugh Dickins <hughd@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, Dave Hansen <dave.hansen@...el.com>, Vlastimil Babka <vbabka@...e.cz>, Christoph Lameter <cl@...two.org>, Naoya Horiguchi <n-horiguchi@...jp.nec.com>, Jerome Marchand <jmarchan@...hat.com>, Sasha Levin <sasha.levin@...cle.com>, Ning Qu <quning@...il.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org Subject: Re: [PATCHv7 00/29] THP-enabled tmpfs/shmem using compound pages On Wed, Apr 20, 2016 at 1:07 AM, Andres Lagar-Cavilla <andreslc@...gle.com> wrote: > Andrea, we provide the, ahem, adjustments to > transparent_hugepage_adjust. Rest assured we aggressively use mmu > notifiers with no further changes required. > > As in: zero changes have been required in the lifetime (years) of > kvm+huge tmpfs at Google, other than mod'ing > transparent_hugepage_adjust. We are using kvm + tmpfs to do qemu live upgrading, how does google use this memory model ? I think our pupose to use tmpfs may be the same. And huge tmpfs is a really good improvement for that. > > As noted by Paolo, the additions to transparent_hugepage_adjust could > be lifted outside of kvm (into shmem.c? maybe) for any consumer of > huge tmpfs with mmu notifiers. > Thanks, Wincy
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