linux-kernel - Re: [PATCH 1/1] perf/tools: Fix "perf record -C... workload" behaviour

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Date:	Mon, 25 Feb 2013 10:58:39 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Anton Arapov <anton@...hat.com>,
	Frank Eigler <fche@...hat.com>,
	Josh Stone <jistone@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"Suzuki K. Poulose" <suzuki@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] perf/tools: Fix "perf record -C... workload"
 behaviour

On Wed, Feb 06, 2013 at 08:42:58PM +0100, Oleg Nesterov wrote:
> Test-case:
> 
> 	# perf record -e probe_libc:syscall -C0 true
> 	true: Terminated
> 
> The child process is killed by perf_record__sig_exit(). This is because
> perf_evlist__prepare_workload() doesn't initialize threads->map[] and
> then perf_event__synthesize_mmap_events() (silently!) fails. This patch

hi,
sorry for late reply..

I think the reason it fails is that it actually got inside
perf_event__synthesize_mmap_events while there's cpu list
specified.

I sent possible fix:
http://marc.info/?l=linux-kernel&m=136178604718144&w=2


> seems to fix the problem, but perhaps we should also move
> 'pr_err("Couldn't run the workload!\n")' down to 'out_delete_session:',

I'll check ;-)

thanks,
jirka
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