From: Avi Kivity <avi@redhat.com>
To: Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Cc: kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
kvm-ppc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Christian Ehrhardt
<ehrhardt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Subject: Re: [PATCH 0 of 6] PowerPC KVM patches for 2.6.29
Date: Wed, 03 Dec 2008 17:06:24 +0000 [thread overview]
Message-ID: <4936BC90.9060401@redhat.com> (raw)
In-Reply-To: <1228320269.10084.7.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
Hollis Blanchard wrote:
>
>> I'm not thrilled about the private exit timing statistics gathering,
>> hopefully it can be morphed into the more general framework.
>>
>
> Is there anything in particular you have in mind? I think it could be
> generally useful, but since x86 has hardware support for performance
> monitoring, oprofile will already give you more accurate information. Of
> course, I don't think you could extract standard deviation from an
> oprofile report, and that has been very useful for us because it can
> tell us e.g. 99% of instruction emulation is handled in the minimum
> amount of time, but 1% takes hundreds of ms.
>
kvmtrace is basically a bunch of trace_marker()s sprinkled around the
code. the marker infrastructure allow you to attach a callback to the
markers, where you can do the accounting. The nice thing it can be
switched off at runtime, being replaced by a nop so
compiled-in-but-disabled overhead is very low.
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Cc: kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
kvm-ppc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Christian Ehrhardt
<ehrhardt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Subject: Re: [PATCH 0 of 6] PowerPC KVM patches for 2.6.29
Date: Wed, 03 Dec 2008 19:06:24 +0200 [thread overview]
Message-ID: <4936BC90.9060401@redhat.com> (raw)
In-Reply-To: <1228320269.10084.7.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
Hollis Blanchard wrote:
>
>> I'm not thrilled about the private exit timing statistics gathering,
>> hopefully it can be morphed into the more general framework.
>>
>
> Is there anything in particular you have in mind? I think it could be
> generally useful, but since x86 has hardware support for performance
> monitoring, oprofile will already give you more accurate information. Of
> course, I don't think you could extract standard deviation from an
> oprofile report, and that has been very useful for us because it can
> tell us e.g. 99% of instruction emulation is handled in the minimum
> amount of time, but 1% takes hundreds of ms.
>
kvmtrace is basically a bunch of trace_marker()s sprinkled around the
code. the marker infrastructure allow you to attach a callback to the
markers, where you can do the accounting. The nice thing it can be
switched off at runtime, being replaced by a nop so
compiled-in-but-disabled overhead is very low.
--
error compiling committee.c: too many arguments to function
--
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next prev parent reply other threads:[~2008-12-03 17:06 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-02 21:51 [PATCH 0 of 6] PowerPC KVM patches for 2.6.29 Hollis Blanchard
2008-12-02 21:51 ` [PATCH 1 of 6] kvm: ppc: support large host pages Hollis Blanchard
2008-12-02 21:51 ` [PATCH 2 of 6] powerpc/44x: declare tlb_44x_index for use in C code Hollis Blanchard
2008-12-02 21:51 ` [PATCH 3 of 6] kvm: ppc: directly insert shadow mappings into the hardware TLB Hollis Blanchard
2008-12-02 21:51 ` [PATCH 4 of 6] kvm: ppc: save and restore guest mappings on context switch Hollis Blanchard
2008-12-02 21:51 ` [PATCH 5 of 6] kvm: ppc: Implement in-kernel exit timing statistics Hollis Blanchard
2008-12-02 21:51 ` [PATCH 6 of 6] kvm: ppc: mostly cosmetic updates to the exit timing accounting code Hollis Blanchard
2008-12-03 11:32 ` [PATCH 0 of 6] PowerPC KVM patches for 2.6.29 Avi Kivity
2008-12-03 11:32 ` Avi Kivity
[not found] ` <49366E68.4080904-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2008-12-03 16:04 ` Hollis Blanchard
2008-12-03 16:04 ` Hollis Blanchard
[not found] ` <1228320269.10084.7.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2008-12-03 17:06 ` Avi Kivity [this message]
2008-12-03 17:06 ` Avi Kivity
2008-12-03 19:22 ` Hollis Blanchard
2008-12-03 19:22 ` Hollis Blanchard
2008-12-03 19:31 ` Hollis Blanchard
2008-12-03 19:31 ` Hollis Blanchard
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