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xen-devel
[Xen-devel] Re: One (possible) x86 get_user_pages bug
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To: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Subject: |
[Xen-devel] Re: One (possible) x86 get_user_pages bug |
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From: |
Avi Kivity <avi@xxxxxxxxxx> |
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Date: |
Sun, 30 Jan 2011 15:01:45 +0200 |
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Cc: |
Kaushik Barde <kbarde@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Kenneth Lee <liguozhu@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Jan Beulich <JBeulich@xxxxxxxxxx>, wangzhenguo@xxxxxxxxxx, Xiaowei Yang <xiaowei.yang@xxxxxxxxxx>, linqaingmin <linqiangmin@xxxxxxxxxx>, fanhenglong@xxxxxxxxxx, Wu Fengguang <fengguang.wu@xxxxxxxxx>, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> |
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Sun, 30 Jan 2011 05:03:04 -0800 |
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On 01/27/2011 08:27 PM, Jeremy Fitzhardinge wrote:
And even just considering virtualization, having non-IPI-based tlb
shootdown is a measurable performance win, since a hypervisor can
optimise away a cross-VCPU shootdown if it knows no physical TLB
contains the target VCPU's entries. I can imagine the KVM folks could
get some benefit from that as well.
It's nice to avoid the IPI (and waking up a cpu if it happens to be
asleep) but I think the risk of deviating too much from the baremetal
arch is too large, as demonstrated by this bug.
(well, async page faults is a counterexample, I wonder if/when it will
bite us)
--
error compiling committee.c: too many arguments to function
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