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

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Message-ID: <56963CD0.7020105@huawei.com>
Date:	Wed, 13 Jan 2016 20:02:24 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Jiri Olsa <jolsa@...hat.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 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.

Thank you.