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Re: [PATCH 2/2] perf_counter: optimize context switch between identical inherited contexts

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From: Paul Mackerras
Subject: Re: [PATCH 2/2] perf_counter: optimize context switch between identical inherited contexts
Date: Friday, May 22, 2009 - 3:07 am

Peter Zijlstra writes:


No, it's one lat_ctx instance, which creates N processes connected in
a ring with pipes, and passes a token around some number of times and
measures the overall time to do that.  It subtracts off the time it
takes to do all the pipe reads and writes in a single process to get
an estimate of how much the context switches are costing.

Paul.
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Messages in current thread:
[PATCH 1/2] perf_counter: dynamically allocate tasks' pe ..., Paul Mackerras, (Thu May 21, 9:17 pm)
[PATCH 2/2] perf_counter: optimize context switch between ..., Paul Mackerras, (Thu May 21, 9:27 pm)
Re: [PATCH 1/2] perf_counter: dynamically allocate tasks' ..., Peter Zijlstra, (Fri May 22, 1:06 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Peter Zijlstra, (Fri May 22, 1:16 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Peter Zijlstra, (Fri May 22, 1:32 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Ingo Molnar, (Fri May 22, 1:57 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Peter Zijlstra, (Fri May 22, 2:02 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Peter Zijlstra, (Fri May 22, 2:22 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Paul Mackerras, (Fri May 22, 2:29 am)
Re: [PATCH 1/2] perf_counter: dynamically allocate tasks' ..., Paul Mackerras, (Fri May 22, 2:30 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Peter Zijlstra, (Fri May 22, 2:42 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Paul Mackerras, (Fri May 22, 2:56 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Paul Mackerras, (Fri May 22, 3:05 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Paul Mackerras, (Fri May 22, 3:07 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Peter Zijlstra, (Fri May 22, 3:08 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Ingo Molnar, (Fri May 22, 3:11 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Ingo Molnar, (Fri May 22, 3:14 am)
[tip:perfcounters/core] perf_counter: Dynamically allocate ..., tip-bot for Paul Mac ..., (Fri May 22, 3:27 am)
[tip:perfcounters/core] perf_counter: Optimize context swi ..., tip-bot for Paul Mac ..., (Fri May 22, 3:27 am)
[tip:perfcounters/core] perf_counter: fix !PERF_COUNTERS b ..., tip-bot for Ingo Molnar, (Fri May 22, 3:36 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Peter Zijlstra, (Fri May 22, 6:46 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Ingo Molnar, (Sat May 23, 5:38 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Peter Zijlstra, (Sat May 23, 6:06 am)
Re: [tip:perfcounters/core] perf_counter: Optimize context ..., Ingo Molnar, (Sun May 24, 4:33 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Paul Mackerras, (Sun May 24, 4:55 pm)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Paul Mackerras, (Sun May 24, 5:15 pm)
Re: [tip:perfcounters/core] perf_counter: Optimize context ..., Paul Mackerras, (Sun May 24, 11:18 pm)
Re: [tip:perfcounters/core] perf_counter: Optimize context ..., Ingo Molnar, (Sun May 24, 11:54 pm)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Peter Zijlstra, (Mon May 25, 3:38 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Peter Zijlstra, (Mon May 25, 3:50 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Paul Mackerras, (Mon May 25, 4:06 am)
Re: [PATCH 2/2] perf_counter: optimize context switch betw ..., Peter Zijlstra, (Mon May 25, 4:27 am)