linux-kernel - Re: Does perf inject preserve call chain data?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4FD232B7.7080905@gmail.com>
Date:	Fri, 08 Jun 2012 11:13:27 -0600
From:	David Ahern <dsahern@...il.com>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel <linux-kernel@...r.kernel.org>, ak@...ux.intel.com,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: Does perf inject preserve call chain data?

On 6/8/12 10:44 AM, Tim Chen wrote:
> On Fri, 2012-06-08 at 11:38 -0300, Arnaldo Carvalho de Melo wrote:
>> Em Tue, May 22, 2012 at 03:58:40PM -0600, David Ahern escreveu:
>>> On 5/22/12 12:49 PM, Tim Chen wrote:
>>>> Arnaldo,
>>>>
>>>> Wonder if perf inject munged the call chain data from perf record?
>>>>
>>>> When I do
>>>> perf record -a -g -o - sleep 5 |perf inject -v -b  | perf report  -g -i -
>>>> I get a complain from perf report
>>>>
>>>> Warning:
>>>> Selected -g but no callchain data. Did you call 'perf record' without -g?
>>>>
>>>
>>> I believe the root cause is that the event list is not written to
>>> the pipe. Using Arnaldo's git repo as of today (has fixes from
>>> Stephane) this hack shows the info is there and can be processed.
>>
>> How things stand here? Tim, did this fix things for you? If so, David,
>> please resend with a proper subject line and a Tested-by: Tim, ok?
>>
>> Thanks,
>>
>> - Arnaldo
>>
>
> It didn't fix things for me when I was testing on a westmere-ex machine.
> I got
>
> # ./perf record -a -g -o - sleep 5 |perf inject -v -b  | perf report -g  -i -
> incompatible file format
> incompatible file formatincompatible file formatselected -g but no callchain data. Did you call perf record without -g?
>
> Testing was done on 3.5.0-rc1.

Is ./ needed in front of the second and third invocations are do you 
have ./ in the PATH?

David
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/