From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Andrea Arcangeli <aarcange@redhat.com>,
Pavel Emelyanov <xemul@parallels.com>,
Dave Hansen <dave.hansen@intel.com>
Subject: Re: [PATCH] mm: /prom/pid/clear_refs: avoid split_huge_page()
Date: Wed, 21 May 2014 23:57:23 +0400 [thread overview]
Message-ID: <20140521195723.GD12819@moon> (raw)
In-Reply-To: <20140521123446.ae45fa676cae27fffbd96cfd@linux-foundation.org>
On Wed, May 21, 2014 at 12:34:46PM -0700, Andrew Morton wrote:
> On Wed, 21 May 2014 22:04:22 +0300 "Kirill A. Shutemov" <kirill.shutemov@linux.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?
We've talking to Kirill how to test is and end up that criu is
the best candidate (though I think I'll write selftest for
vanilla too, hopefully tomorrow).
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next prev parent reply other threads:[~2014-05-21 19:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-21 19:04 [PATCH] mm: /prom/pid/clear_refs: avoid split_huge_page() Kirill A. Shutemov
2014-05-21 19:19 ` Cyrill Gorcunov
2014-05-21 19:34 ` Andrew Morton
2014-05-21 19:57 ` Cyrill Gorcunov [this message]
2014-05-22 1:11 ` Kirill A. Shutemov
2014-05-22 5:32 ` Cyrill Gorcunov
2014-05-22 8:35 ` Cyrill Gorcunov
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