linux-kernel - Re: [PATCH 0/4] Add support of guest user space symbols for perf kvm command.

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Message-ID: <52B31EC1.6050403@gmail.com>
Date:	Thu, 19 Dec 2013 09:28:49 -0700
From:	David Ahern <dsahern@...il.com>
To:	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	Dongsheng Yang <yangds.fnst@...fujitsu.com>,
	linux-kernel@...r.kernel.org, eranian@...gle.com,
	adrian.hunter@...el.com, mingo@...hat.com, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, Pekka Enberg <penberg@....fi>
Subject: Re: [PATCH 0/4] Add support of guest user space symbols for perf
 kvm command.

On 12/19/13, 8:34 AM, Ingo Molnar wrote:

> Btw., having to specify a '--guestmount /tmp/guestmount/' just to
> achieve a natural feature (proper guest symbol resolution) is a poor
> user interface, obviously.
>
> Is there perhaps a predictable pattern as to where qemu (or libvirt)
> puts a user's guest mounts, or some other discovery method?

No, qemu does not export guest info to the host. A user has to create it 
-- either using something like sshfs or copying the files. I tend to use 
the latter as it is simpler.

David

>
> If yes then it would be possible to automatically look for that
> pattern, and use the guest filesystem when it's available, without the
> user having to manually configure the path.
>
> ( Ideally we'd have kernel help for discovering this, but last time I
>    raised that with the KVM folks there was resistence. )


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