linux-kernel - Re: [PATCH 1/3] perf, tool: Force guest machine definition option

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Date:	Fri, 13 Apr 2012 06:21:54 -0600
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	acme@...hat.com, a.p.zijlstra@...llo.nl, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] perf, tool: Force guest machine definition option

On 4/13/12 5:32 AM, Jiri Olsa wrote:
>> Even with guestmount specified you can hit this path -- e.g., no
>> pid-based directory under guestmount for a VM.
>
> hm, something's wrong anyway..
>
> [root@...p-26-214 perf]# ./perf kvm --guest --guestkallsyms=./kallsyms record -p 1791
> ^C[ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.013 MB perf.data.guest (~576 samples) ]
> [root@...p-26-214 perf]# ./perf kvm --guest --guestkallsyms=./kallsyms report --stdio
> Segmentation fault (core dumped)
>
> it segfaults on guest mmap (attached bt) having NULL machine,
> since no guest kernel buildid/dso was stored&loaded..
> the host/guest machines code seems too 'complex' ;)

That was fixed on Monday I believe. Patch is in Arnaldo's urgent queue.


David
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