linux-kernel - Re: [PATCH] perf kvm record: Change the default value of perf

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Message-ID: <528534E0.3030209@gmail.com>
Date:	Thu, 14 Nov 2013 13:38:56 -0700
From:	David Ahern <dsahern@...il.com>
To:	Dongsheng Yang <yangds.fnst@...fujitsu.com>, mingo@...nel.org
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf kvm record: Change the default value of perf_guest
 to 0.

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
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