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From: Steven Rostedt <rostedt@goodmis.org>
To: David Ahern <dsahern@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Ingo Molnar <mingo@redhat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
	Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@huawei.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] tracing/perf: perf_trace_buf/perf_xxx hacks.
Date: Thu, 20 Jun 2013 18:20:47 -0400	[thread overview]
Message-ID: <1371766847.18733.109.camel@gandalf.local.home> (raw)
In-Reply-To: <1371754391.18733.107.camel@gandalf.local.home>

On Thu, 2013-06-20 at 14:53 -0400, Steven Rostedt wrote:

> Oh wait, I just noticed Oleg's:
> 
> # perf record -e sched:sched_switch -p1 &
> 
> I missed that.
> 
> bah, time to re-run it.
> 


New update, after running with the above command:

[root@ixf ~]# cat perf-bench-sched.before.2 | tail -20
     Total time: 11.833 [sec]

      11.833804 usecs/op
          84503 ops/sec

 Performance counter stats for process id '1' (100 runs):

     <not counted> task-clock              
     <not counted> context-switches        
     <not counted> cpu-migrations          
     <not counted> page-faults             
     <not counted> cycles                  
   <not supported> stalled-cycles-frontend 
   <not supported> stalled-cycles-backend  
     <not counted> instructions            
     <not counted> branches                
     <not counted> branch-misses           

      11.955755673 seconds time elapsed
( +-  0.05% )

[root@ixf ~]# cat perf-bench-sched.after-2 | tail -20
     Total time: 11.490 [sec]

      11.490764 usecs/op
          87026 ops/sec

 Performance counter stats for process id '1' (100 runs):

     <not counted> task-clock              
     <not counted> context-switches        
     <not counted> cpu-migrations          
     <not counted> page-faults             
     <not counted> cycles                  
   <not supported> stalled-cycles-frontend 
   <not supported> stalled-cycles-backend  
     <not counted> instructions            
     <not counted> branches                
     <not counted> branch-misses           

      11.511847099 seconds time elapsed
( +-  0.05% )


OK, this does give us a slight improvement. Approximately 4%.

-- Steve



  reply	other threads:[~2013-06-20 22:20 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-18 19:21 [PATCH 0/3] tracing/perf: perf_trace_buf/perf_xxx hacks Oleg Nesterov
2013-06-18 19:22 ` [PATCH 1/3] tracing/perf: expand TRACE_EVENT(sched_stat_runtime) Oleg Nesterov
2013-06-18 19:22 ` [PATCH 2/3] tracing/perf: reimplement TP_perf_assign() logic Oleg Nesterov
2013-06-18 19:22 ` [PATCH 3/3] tracing/perf: Avoid perf_trace_buf_*() in perf_trace_##call() when possible Oleg Nesterov
2013-06-18 20:02   ` Steven Rostedt
2013-06-19 18:12     ` Oleg Nesterov
2013-06-19 18:24       ` Steven Rostedt
2013-06-19 12:10 ` [PATCH 0/3] tracing/perf: perf_trace_buf/perf_xxx hacks Peter Zijlstra
2013-06-19 15:28   ` Oleg Nesterov
2013-06-19 17:51     ` Oleg Nesterov
2013-06-19 18:50       ` David Ahern
2013-06-19 19:58         ` Oleg Nesterov
2013-06-20 18:23           ` Steven Rostedt
2013-06-20 18:35             ` David Ahern
2013-06-20 18:47               ` Steven Rostedt
2013-06-20 18:53                 ` David Ahern
2013-06-20 18:53                 ` Steven Rostedt
2013-06-20 22:20                   ` Steven Rostedt [this message]
2013-07-18  3:06 ` Steven Rostedt

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