From: Michal Hocko <mhocko@kernel.org>
To: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Andrew Morton <akpm@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Pavel Emelyanov <xemul@virtuozzo.com>,
linux-mm <linux-mm@kvack.org>,
lkml <linux-kernel@vger.kernel.org>,
Linux API <linux-api@vger.kernel.org>
Subject: Re: [PATCH] mm: introduce MADV_CLR_HUGEPAGE
Date: Tue, 30 May 2017 09:44:08 +0200 [thread overview]
Message-ID: <20170530074408.GA7969@dhcp22.suse.cz> (raw)
In-Reply-To: <20170524142735.GF3063@rapoport-lnx>
On Wed 24-05-17 17:27:36, Mike Rapoport wrote:
> On Wed, May 24, 2017 at 01:18:00PM +0200, Michal Hocko wrote:
[...]
> > Why cannot khugepaged simply skip over all VMAs which have userfault
> > regions registered? This would sound like a less error prone approach to
> > me.
>
> khugepaged does skip over VMAs which have userfault. We could register the
> regions with userfault before populating them to avoid collapses in the
> transition period.
Why cannot you register only post-copy regions and "manually" copy the
pre-copy parts?
> But then we'll have to populate these regions with
> UFFDIO_COPY which adds quite an overhead.
How big is the performance impact?
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2017-05-30 7:44 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-22 6:12 [PATCH] mm: introduce MADV_CLR_HUGEPAGE Mike Rapoport
2017-05-22 7:26 ` Anshuman Khandual
2017-05-22 8:12 ` Mike Rapoport
2017-05-22 11:42 ` Kirill A. Shutemov
2017-05-22 13:36 ` Mike Rapoport
2017-05-22 13:44 ` Kirill A. Shutemov
2017-05-22 13:55 ` Michal Hocko
2017-05-22 14:29 ` Mike Rapoport
2017-05-22 15:52 ` Vlastimil Babka
2017-05-22 17:51 ` Mike Rapoport
2017-05-24 7:50 ` Mike Rapoport
2017-05-24 7:58 ` Vlastimil Babka
2017-05-24 10:39 ` Mike Rapoport
2017-05-24 11:18 ` Michal Hocko
2017-05-24 14:25 ` Pavel Emelyanov
2017-05-24 14:27 ` Mike Rapoport
2017-05-24 15:22 ` Andrea Arcangeli
2017-05-30 7:44 ` Michal Hocko [this message]
2017-05-30 10:19 ` Mike Rapoport
2017-05-30 10:39 ` Michal Hocko
2017-05-30 14:04 ` Andrea Arcangeli
2017-05-30 14:39 ` Michal Hocko
2017-05-30 14:56 ` Michal Hocko
2017-05-30 16:06 ` Andrea Arcangeli
2017-05-31 6:30 ` Vlastimil Babka
2017-05-31 8:24 ` Michal Hocko
2017-05-31 9:27 ` Mike Rapoport
2017-05-31 10:24 ` Michal Hocko
2017-05-31 10:22 ` Michal Hocko
2017-06-01 11:00 ` Mike Rapoport
2017-06-01 12:27 ` Michal Hocko
2017-05-30 15:43 ` Andrea Arcangeli
2017-05-31 12:08 ` Michal Hocko
2017-05-31 12:39 ` Mike Rapoprt
2017-05-31 14:18 ` Andrea Arcangeli
2017-05-31 14:32 ` Michal Hocko
2017-05-31 15:46 ` Andrea Arcangeli
2017-06-01 6:58 ` Mike Rapoport
2017-05-31 14:19 ` Michal Hocko
2017-06-01 6:53 ` Mike Rapoport
2017-06-01 8:09 ` Michal Hocko
2017-06-01 8:35 ` Mike Rapoport
2017-06-01 13:45 ` Andrea Arcangeli
2017-06-02 9:11 ` Mike Rapoport
2017-05-31 9:08 ` Mike Rapoport
2017-05-31 12:05 ` Michal Hocko
2017-05-31 12:25 ` Mike Rapoprt
2017-05-24 11:31 ` Vlastimil Babka
2017-05-24 14:28 ` Pavel Emelyanov
2017-05-24 14:54 ` Vlastimil Babka
2017-05-24 15:13 ` Mike Rapoport
2017-05-22 15:33 ` kbuild test robot
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