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Re: [PATCH v3 4/6] add a new scheduler hook for context switch [message #46625 is a reply to message #46620]

Wed, 30 May 2012 11:40

Peter Zijlstra
Messages: 61
Registered: September 2006

Member

On Wed, 2012-05-30 at 13:20 +0200, Peter Zijlstra wrote:
>
> $ perf stat -e cycles --repeat 100 perf bench sched messaging -p -g 100
>
> 48,826,146,710 cycles # 2.470 GHz ( +- 0.17% )
> 2.149005270 seconds time elapsed ( +- 0.12% )

A repeat count of 250 dropped it down to:

2.144582157 seconds time elapsed ( +- 0.08% )

Also, if you're poking at the context switch path, something like:

$ taskset 1 perf stat -e cycles --repeat 10 perf bench sched pipe -l 100000

gives a good number and is usually more stable than hackbench.

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[Message index]

		[PATCH v3 0/6] per cgroup /proc/stat statistics By: Glauber Costa on Wed, 30 May 2012 09:48
		[PATCH v3 4/6] add a new scheduler hook for context switch By: Glauber Costa on Wed, 30 May 2012 09:48
		Re: [PATCH v3 4/6] add a new scheduler hook for context switch By: Peter Zijlstra on Wed, 30 May 2012 11:20
		Re: [PATCH v3 4/6] add a new scheduler hook for context switch By: Peter Zijlstra on Wed, 30 May 2012 11:40
		Re: [PATCH v3 4/6] add a new scheduler hook for context switch By: Glauber Costa on Wed, 30 May 2012 12:08
		Re: [PATCH v3 4/6] add a new scheduler hook for context switch By: Glauber Costa on Wed, 30 May 2012 12:07
		[PATCH v3 6/6] expose per-taskgroup schedstats in cgroup By: Glauber Costa on Wed, 30 May 2012 09:48
		Re: [PATCH v3 6/6] expose per-taskgroup schedstats in cgroup By: Peter Zijlstra on Wed, 30 May 2012 11:22
		[PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats By: Glauber Costa on Wed, 30 May 2012 09:48
		Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats By: Peter Zijlstra on Wed, 30 May 2012 10:34
		Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats By: Glauber Costa on Wed, 30 May 2012 10:34
		Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats By: Peter Zijlstra on Wed, 30 May 2012 10:43
		Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats By: Glauber Costa on Wed, 30 May 2012 10:44
		Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats By: Peter Zijlstra on Wed, 30 May 2012 11:24
		Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats By: Paul Turner on Wed, 30 May 2012 11:24
		Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats By: Glauber Costa on Wed, 30 May 2012 12:20
		Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats By: Paul Turner on Wed, 30 May 2012 12:48
		Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats By: Glauber Costa on Wed, 30 May 2012 12:52
		Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats By: Glauber Costa on Wed, 30 May 2012 13:26
		Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats By: Glauber Costa on Wed, 30 May 2012 13:26
		[PATCH v3 1/6] measure exec_clock for rt sched entities By: Glauber Costa on Wed, 30 May 2012 09:48
		Re: [PATCH v3 1/6] measure exec_clock for rt sched entities By: Peter Zijlstra on Wed, 30 May 2012 10:29
		Re: [PATCH v3 1/6] measure exec_clock for rt sched entities By: Glauber Costa on Wed, 30 May 2012 10:32
		Re: [PATCH v3 1/6] measure exec_clock for rt sched entities By: Peter Zijlstra on Wed, 30 May 2012 10:42
		Re: [PATCH v3 1/6] measure exec_clock for rt sched entities By: Glauber Costa on Wed, 30 May 2012 10:42
		Re: [PATCH v3 1/6] measure exec_clock for rt sched entities By: Paul Turner on Wed, 30 May 2012 11:00
		Re: [PATCH v3 1/6] measure exec_clock for rt sched entities By: Glauber Costa on Wed, 30 May 2012 12:09
		[PATCH v3 5/6] Also record sleep start for a task group By: Glauber Costa on Wed, 30 May 2012 09:48
		Re: [PATCH v3 5/6] Also record sleep start for a task group By: Paul Turner on Wed, 30 May 2012 11:35
		Re: [PATCH v3 5/6] Also record sleep start for a task group By: Glauber Costa on Wed, 30 May 2012 12:24
		Re: [PATCH v3 5/6] Also record sleep start for a task group By: Peter Zijlstra on Wed, 30 May 2012 12:44
		Re: [PATCH v3 5/6] Also record sleep start for a task group By: Glauber Costa on Wed, 30 May 2012 12:44

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