linux-kernel - Re: [PATCH] perf auto-dep: Speed up feature tests by building them in parallel

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Message-ID: <20130930172741.GD10293@ghostprotocols.net>
Date:	Mon, 30 Sep 2013 14:27:41 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	David Ahern <dsahern@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...il.com>
Subject: Re: [PATCH] perf auto-dep: Speed up feature tests by building them
 in parallel

Em Mon, Sep 30, 2013 at 02:12:20PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Sep 30, 2013 at 06:42:10PM +0200, Ingo Molnar escreveu:
> > 
> > This series (with combo patch attached) implements (much) faster 
> > perf-tools feature-auto-detection.
> 
> Cool stuff!
> 
> Testing:
> 
> [acme@zoo linux]$ cat /etc/fedora-release 
> Fedora release 18 (Spherical Cow)

Before:

 Performance counter stats for 'make -j4 -C tools/perf O=/tmp/build/perf' (3 runs):

       7.336208823 seconds time elapsed               ( +-  5.75% )

After:

       3.831295406 seconds time elapsed               ( +-  1.20% )

- Arnaldo
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