From: David Rientjes <rientjes@google.com>
To: "Jason J. Herne" <jjherne@linux.vnet.ibm.com>
Cc: linux-s390@vger.kernel.org, linux-mm@kvack.org,
akpm@linux-foundation.org, aarcange@redhat.com,
borntraeger@de.ibm.com
Subject: Re: [PATCH] mm: Loosen MADV_NOHUGEPAGE to enable Qemu postcopy on s390
Date: Fri, 13 Nov 2015 14:58:32 -0800 (PST) [thread overview]
Message-ID: <alpine.DEB.2.10.1511131458210.6173@chino.kir.corp.google.com> (raw)
In-Reply-To: <1447341516-18076-1-git-send-email-jjherne@linux.vnet.ibm.com>
On Thu, 12 Nov 2015, Jason J. Herne wrote:
> MADV_NOHUGEPAGE processing is too restrictive. kvm already disables
> hugepage but hugepage_madvise() takes the error path when we ask to turn
> on the MADV_NOHUGEPAGE bit and the bit is already on. This causes Qemu's
> new postcopy migration feature to fail on s390 because its first action is
> to madvise the guest address space as NOHUGEPAGE. This patch modifies the
> code so that the operation succeeds without error now.
>
> Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
> Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
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next prev parent reply other threads:[~2015-11-13 22:58 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-12 15:18 [PATCH] mm: Loosen MADV_NOHUGEPAGE to enable Qemu postcopy on s390 Jason J. Herne
2015-11-12 16:45 ` Christian Borntraeger
2015-11-13 22:58 ` David Rientjes [this message]
[not found] ` <1447341516-18076-1-git-send-email-jjherne-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2015-11-18 13:31 ` Vlastimil Babka
2015-11-18 13:31 ` Vlastimil Babka
2015-11-19 8:22 ` Christian Borntraeger
2015-11-19 8:22 ` [Qemu-devel] " Christian Borntraeger
[not found] ` <564D86AE.1010305-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
2015-11-19 9:31 ` Vlastimil Babka
2015-11-19 9:31 ` [Qemu-devel] " Vlastimil Babka
2015-11-19 9:31 ` Vlastimil Babka
2015-11-19 9:43 ` Dr. David Alan Gilbert
2015-11-19 9:43 ` [Qemu-devel] " Dr. David Alan Gilbert
2015-11-19 13:10 ` Dr. David Alan Gilbert
2015-11-19 14:30 ` Jason J. Herne
-- strict thread matches above, loose matches on Subject: below --
2015-11-11 15:35 Jason J. Herne
2015-11-11 17:30 ` Andrea Arcangeli
2015-11-11 19:47 ` Christian Borntraeger
2015-11-11 19:47 ` Christian Borntraeger
2015-11-11 20:42 ` Andrea Arcangeli
2015-11-11 20:42 ` Andrea Arcangeli
2015-11-11 20:01 ` Christian Borntraeger
2015-11-11 20:37 ` Andrea Arcangeli
2015-11-11 20:37 ` Andrea Arcangeli
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