linux-kernel - Re: [PATCHv7 00/29] THP-enabled tmpfs/shmem using compound pages

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Message-ID: <CACzj_yVnuirXiOt7EiH+SKj27Rk8DOq5hoz8aBD6r1WROFNGdQ@mail.gmail.com>
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