linux-kernel - Re: [PATCH] mm: /prom/pid/clear_refs: avoid split_huge

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Message-Id: <20140521123446.ae45fa676cae27fffbd96cfd@linux-foundation.org>
Date:	Wed, 21 May 2014 12:34:46 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrea Arcangeli <aarcange@...hat.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Dave Hansen <dave.hansen@...el.com>
Subject: Re: [PATCH] mm: /prom/pid/clear_refs: avoid split_huge_page()

On Wed, 21 May 2014 22:04:22 +0300 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> wrote:

> Currently we split all THP pages on any clear_refs request. It's not
> necessary. We can handle this on PMD level.
> 
> One side effect is that soft dirty will potentially see more dirty
> memory, since we will mark whole THP page dirty at once.

This clashes pretty badly with
http://ozlabs.org/~akpm/mmots/broken-out/clear_refs-redefine-callback-functions-for-page-table-walker.patch

> Sanity checked with CRIU test suite. More testing is required.

Will you be doing that testing or was this a request for Cyrill & co to
help?

Perhaps this is post-3.15 material.
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