From: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
To: David Ahern <dsahern@gmail.com>
Cc: mingo@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] perf kvm record: Change the default value of perf_guest to 0.
Date: Fri, 15 Nov 2013 15:03:27 -0500 [thread overview]
Message-ID: <52867E0F.6020601@cn.fujitsu.com> (raw)
In-Reply-To: <528534E0.3030209@gmail.com>
Hi David:
On 11/14/2013 03:38 PM, David Ahern wrote:
> On 11/14/13, 2:51 PM, Dongsheng Yang wrote:
>> Currently, we can not record the event counters of host to
>> perf.data.host.
>> Example:
>> perf kvm --host record -a sleep 1
>> [ perf record: Woken up 1 times to write data ]
>> [ perf record: Captured and wrote 0.625 MB perf.data.guest (~27290
>> samples) ]
>
> perf kvm by definition wants --guest enabled. Host profiling is done
> with just 'perf record'; no need for the kvm layer at all. If you
> really want to go through perf-kvm to record host events disable guest
> actions:
>
> $ perf kvm --host --no-guest record -a sleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.029 MB perf.data.host (~1255
> samples) ]
>
>
> David
Thanx for your reply ! It makes sense.
next prev parent reply other threads:[~2013-11-15 7:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-14 21:51 [PATCH] perf kvm record: Change the default value of perf_guest to 0 Dongsheng Yang
2013-11-14 20:38 ` David Ahern
2013-11-15 20:03 ` Dongsheng Yang [this message]
-- strict thread matches above, loose matches on Subject: below --
2013-11-14 21:29 Dongsheng Yang
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