linux-kernel - Re: [PATCH 3/3] perf events: Change perf parameter --pid to process-wide collection instead of thread-wide

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Message-ID: <4BAB1881.8020500@cn.fujitsu.com>
Date:	Thu, 25 Mar 2010 16:02:09 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, Sheng Yang <sheng@...ux.intel.com>,
	oerg Roedel <joro@...tes.org>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...hat.com>, kvm@...r.kernel.org,
	zhiteng.huang@...el.com, Zachary Amsden <zamsden@...hat.com>
Subject: Re: [PATCH 3/3] perf events: Change perf parameter --pid to process-wide
 collection instead of thread-wide

Zhang, Yanmin wrote:
> From: Zhang, Yanmin <yanmin_zhang@...ux.intel.com>
> 
> Parameter --pid (or -p) of perf currently means a thread-wide collection.
> For exmaple, if a process whose id is 8888 has 10 threads, 'perf top -p 8888'
> just collects the main thread statistics. That's misleading. Users are
> used to attach a whole process when debugging a process by gdb. To follow
> normal usage style, the patch change --pid to process-wide collection and
> add --tid (-t) to mean a thread-wide collection.
> 
> Usage example is:
> #perf top -p 8888
> #perf record -p 8888 -f sleep 10
> #perf stat -p 8888 -f sleep 10
> Above commands collect the statistics of all threads of process 8888.
> 
> Signed-off-by: Zhang Yanmin <yanmin_zhang@...ux.intel.com>
> 

Seems this patch causes seg faults:

# ./perf sched record
Segmentation fault
# ./perf kmem record
Segmentation fault
# ./perf timechart record
Segmentation fault



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