From: David Vrabel <david.vrabel@citrix.com>
To: David Sutton <kantras@gmail.com>
Cc: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: [PATCH 1/2] Revert "xen: properly account for _PAGE_NUMA during xen pte translations"
Date: Tue, 25 Mar 2014 17:13:51 +0000 [thread overview]
Message-ID: <5331B94F.9020601@citrix.com> (raw)
In-Reply-To: <CAPCj91+c8kE8dgp7U3N1ti=XOzFrgcg3Z3S9dYK4AG1tEMqsaA@mail.gmail.com>
On 25/03/14 15:28, David Sutton wrote:
> David,
>
>> This reverts commit a9c8e4beeeb64c22b84c803747487857fe424b68.
>>
> Please note: this particular patch also helped to resolve an issue
> reported by some of the people using the xen package under Arch Linux,
> where they would see stability issues running certain software
> (particularly firefox) under dom0 - the software would start crashing
> under relatively light usage, with a kernel BUG message.
We are aware that Xen PV guests will not work if CONFIG_NUMA_BALANCING
is enabled with this revert. But that patch introduced fundamental
breakage to how a guest must read/write non-present page tables entries
which caused even worse breakage.
I suspect that the problematic patch 1667918b6483 ("mm: numa: clear numa
hinting information on mprotect") is not needed on x86 and could be
safely reverted as a temporarily fix.
David
next prev parent reply other threads:[~2014-03-25 17:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-25 15:28 [PATCH 1/2] Revert "xen: properly account for _PAGE_NUMA during xen pte translations" David Sutton
2014-03-25 17:13 ` David Vrabel [this message]
2014-03-25 18:19 ` Konrad Rzeszutek Wilk
2014-03-25 18:19 ` [Xen-devel] " Konrad Rzeszutek Wilk
2014-03-25 18:30 ` David Vrabel
2014-03-25 18:30 ` [Xen-devel] " David Vrabel
2014-03-25 19:03 ` David Sutton
2014-03-25 19:12 ` David Vrabel
-- strict thread matches above, loose matches on Subject: below --
2014-03-21 18:18 [RFC PATCH 0/2] x86: fix Xen PV regression caused by NUMA page migration David Vrabel
2014-03-21 18:18 ` [PATCH 1/2] Revert "xen: properly account for _PAGE_NUMA during xen pte translations" David Vrabel
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