linux-kernel - Re: [RFC 6/6] perf build: Introduce FEATURES

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Message-ID: <20160113121520.GA28969@krava.brq.redhat.com>
Date:	Wed, 13 Jan 2016 13:15:20 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC 6/6] perf build: Introduce FEATURES_DUMP make variable

On Wed, Jan 13, 2016 at 08:02:24PM +0800, Wangnan (F) wrote:
> 
> 
> On 2016/1/13 18:03, Jiri Olsa wrote:
> >On Wed, Jan 13, 2016 at 05:46:13PM +0800, Wangnan (F) wrote:
> >
> >SNIP
> >
> >>>I'll try to check on that.. does this patch help to improve
> >>>the current speed or do you need to solve this to get substantial
> >>>speedup?
> 
> Finished.
> 
> On a 24 core machine:
> 
> Without this feature, a full build-test takes:
> 
> real    21m16.579s
> user    176m12.989s
> sys    20m54.950s
> 
> With this feature:
> 
> real    16m0.619s
> user    172m53.896s
> sys    19m22.777s
> 
> Speedup: 24.75%.
> 
> So this feature is really useful.

looks great, thanks

jirka