linux-kernel - Re: [PATCH 1/2] perf bench futex: Support parallel waker threads

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Message-ID: <20150508192429.GP7862@kernel.org>
Date:	Fri, 8 May 2015 16:24:29 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Davidlohr Bueso <dave@...olabs.net>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH 1/2] perf bench futex: Support parallel waker threads

Em Fri, May 08, 2015 at 11:37:59AM -0700, Davidlohr Bueso escreveu:
> The futex-wake benchmark only measures wakeups done within
> a single process. While this has value in its own, it does
> not really generate any hb->lock contention. A new benchmark
> 'wake-parallel' is added, by extending the futex-wake code
> such that we can measure parallel waker threads. The program
> output shows the avg per-thread latency in order to complete
> its share of wakeups:
> 
> Run summary [PID 13474]: blocking on 512 threads (at [private] futex 0xa88668), 8 threads waking up 64 at a time.

Thanks, applied both to perf/core.

- Arnaldo
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