From: Peter Zijlstra <peterz@infradead.org>
To: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>, Joerg Roedel <joro@8bytes.org>,
Jes Sorensen <Jes.Sorensen@redhat.com>,
KVM General <kvm@vger.kernel.org>, Avi Kivity <avi@redhat.com>,
Zachary Amsden <zamsden@redhat.com>,
Gleb Natapov <gleb@redhat.com>,
ming.m.lin@intel.com
Subject: Re: KVM PMU virtualization
Date: Tue, 02 Mar 2010 10:57:02 +0100 [thread overview]
Message-ID: <1267523822.25158.28.camel@laptop> (raw)
In-Reply-To: <1267513746.1726.104.camel@localhost>
On Tue, 2010-03-02 at 15:09 +0800, Zhang, Yanmin wrote:
> With vanilla host kernel, perf top data is stable and spinlock doesn't take too much cpu time.
> With guest os, __ticket_spin_lock consumes 28% cpu time, and sometimes it fluctuates between 9%~28%.
>
> Another interesting finding is aim7. If I start aim7 on tmpfs testing in guest os with 1GB memory,
> the login hangs and cpu is busy. With the new patch, I could check what happens in guest os, where
> spinlock is busy and kernel is shrinking memory mostly from slab.
Hehe, you've just discovered the reason for paravirt spinlocks ;-)
But neat stuff, although I don't think you need PERF_SAMPLE_KVM, it
should simply always report the guest sample if it came from the guest,
you can extend PERF_RECORD_MISC_CPUMODE_MASK to add guest states.
next prev parent reply other threads:[~2010-03-02 9:57 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-25 15:04 KVM PMU virtualization Jes Sorensen
2010-02-25 15:44 ` Jan Kiszka
2010-02-25 16:26 ` Ingo Molnar
2010-02-26 2:52 ` Zhang, Yanmin
2010-02-26 8:45 ` Ingo Molnar
2010-02-26 11:03 ` Jes Sorensen
2010-02-25 17:34 ` Joerg Roedel
2010-02-26 2:55 ` Zhang, Yanmin
2010-02-26 8:51 ` Joerg Roedel
2010-02-26 9:17 ` Ingo Molnar
2010-02-26 10:42 ` Joerg Roedel
2010-02-26 10:56 ` Ingo Molnar
2010-03-02 7:09 ` Zhang, Yanmin
2010-03-02 9:36 ` Ingo Molnar
2010-03-03 3:32 ` Zhang, Yanmin
2010-03-03 9:27 ` Zhang, Yanmin
2010-03-03 10:13 ` Peter Zijlstra
2010-03-04 0:52 ` Zhang, Yanmin
2010-03-03 10:15 ` Peter Zijlstra
2010-03-04 1:00 ` Zhang, Yanmin
2010-03-10 9:29 ` Zhang, Yanmin
2010-03-02 9:57 ` Peter Zijlstra [this message]
2010-02-26 8:42 ` Ingo Molnar
2010-02-26 9:46 ` Avi Kivity
2010-02-26 10:39 ` Joerg Roedel
2010-02-26 10:46 ` Ingo Molnar
2010-02-26 10:51 ` Avi Kivity
2010-02-26 11:06 ` Joerg Roedel
2010-02-26 11:18 ` Jes Sorensen
2010-02-26 11:24 ` Ingo Molnar
2010-02-26 11:25 ` Jes Sorensen
2010-02-26 11:20 ` Ingo Molnar
2010-02-26 10:44 ` Ingo Molnar
2010-02-26 11:16 ` Avi Kivity
2010-02-26 11:26 ` Ingo Molnar
2010-02-26 11:47 ` Avi Kivity
2010-02-26 11:23 ` Jes Sorensen
2010-02-26 11:42 ` Ingo Molnar
2010-02-26 11:51 ` Avi Kivity
2010-02-26 12:07 ` Ingo Molnar
2010-02-26 12:20 ` Avi Kivity
2010-02-26 12:38 ` Ingo Molnar
2010-02-26 13:04 ` Avi Kivity
2010-02-26 13:13 ` Jes Sorensen
2010-02-26 13:27 ` Ingo Molnar
2010-02-26 13:33 ` Avi Kivity
2010-02-26 14:07 ` Jes Sorensen
2010-02-26 14:11 ` Avi Kivity
2010-02-26 13:18 ` Ingo Molnar
2010-02-26 13:34 ` Jes Sorensen
2010-02-26 12:56 ` Jes Sorensen
2010-02-26 13:31 ` Ingo Molnar
2010-02-26 13:37 ` Jes Sorensen
2010-02-26 13:55 ` Avi Kivity
2010-02-26 14:27 ` Peter Zijlstra
2010-02-26 14:54 ` Avi Kivity
2010-02-26 15:08 ` Peter Zijlstra
2010-02-26 15:11 ` Avi Kivity
2010-02-26 15:18 ` Peter Zijlstra
2010-02-26 15:55 ` Peter Zijlstra
2010-02-26 16:06 ` Avi Kivity
2010-03-01 19:03 ` Zachary Amsden
2010-03-01 18:54 ` Zachary Amsden
2010-02-26 13:40 ` Avi Kivity
2010-02-26 14:01 ` Ingo Molnar
2010-02-26 14:22 ` Avi Kivity
2010-02-26 14:37 ` Ingo Molnar
2010-02-26 16:03 ` Avi Kivity
2010-02-26 16:07 ` Avi Kivity
2010-02-26 13:28 ` Peter Zijlstra
2010-02-26 13:44 ` Avi Kivity
2010-02-26 13:51 ` Jes Sorensen
2010-02-26 14:42 ` Peter Zijlstra
2010-03-08 18:14 ` Avi Kivity
2010-02-26 12:49 ` Jes Sorensen
2010-02-26 13:06 ` Ingo Molnar
2010-02-26 13:30 ` Avi Kivity
2010-02-26 13:32 ` Jes Sorensen
2010-02-26 13:44 ` Ingo Molnar
2010-02-26 13:53 ` Avi Kivity
2010-02-26 14:12 ` Ingo Molnar
2010-02-26 14:53 ` Avi Kivity
2010-02-26 15:14 ` Peter Zijlstra
2010-02-28 16:34 ` Joerg Roedel
2010-02-28 16:31 ` Joerg Roedel
2010-02-28 16:11 ` Joerg Roedel
2010-03-01 8:39 ` Ingo Molnar
2010-03-01 8:58 ` Joerg Roedel
2010-03-01 9:04 ` Ingo Molnar
2010-03-01 8:44 ` Ingo Molnar
2010-03-01 11:11 ` Joerg Roedel
2010-03-01 17:17 ` Peter Zijlstra
2010-03-01 18:36 ` Joerg Roedel
2010-03-08 10:15 ` Avi Kivity
2010-02-26 14:49 ` Peter Zijlstra
2010-02-26 14:50 ` Peter Zijlstra
2010-02-26 13:31 ` Jes Sorensen
2010-03-01 17:22 ` Zachary Amsden
2010-02-26 11:01 ` Jes Sorensen
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