linux-kernel - Re: perf top: losing events?

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Date:	Thu, 21 Jan 2010 07:02:36 +0100
From:	Mike Galbraith <efault@....de>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: perf top: losing events?

Yup, definitely a booboo in there somewhere.

Step 1.

oinker running, perf top -C 3 -z


------------------------------------------------------------------------------------------------------------------------------
   PerfTop:    1001 irqs/sec  kernel: 0.0% [1000Hz cycles],  (all, cpu: 3)                                                    
------------------------------------------------------------------------------------------------------------------------------

             samples  pcnt func DSO
             _______ _____ ____ ______________

             2003.00 100.0% main /root/bin/pert

perfect (off by one is beauty mark, not wart;)

Step 2.

taskset -c 3 ./massive_intr 3 999


  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  P COMMAND
 7133 root      20   0  7928  232  128 R   25  0.0   0:09.68 3 massive_intr
 7134 root      20   0  7928  232  128 R   25  0.0   0:09.68 3 massive_intr
25932 root      20   0  7920  584  476 R   25  0.0  42:03.07 3 pert
 7132 root      20   0  7928  232  128 R   25  0.0   0:09.68 3 massive_intr

------------------------------------------------------------------------------------------------------------------------------
   PerfTop:     252 irqs/sec  kernel: 0.8% [1000Hz cycles],  (all, cpu: 3)
------------------------------------------------------------------------------------------------------------------------------

             samples  pcnt func DSO
             _______ _____ ____ ______________

              500.00 99.2% main /root/bin/pert


massive_intr appeared briefly, then poof, gone (likely when it forked
off worker-bees), leaving this.

	-Mike

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