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Date: Wed, 13 Jan 2016 20:02:24 +0800
From: "Wangnan (F)" <wangnan0@huawei.com>
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To: Jiri Olsa <jolsa@redhat.com>
CC: Jiri Olsa <jolsa@kernel.org>, Arnaldo Carvalho de Melo <acme@kernel.org>,
        lkml <linux-kernel@vger.kernel.org>, David Ahern <dsahern@gmail.com>,
        "Ingo Molnar" <mingo@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [RFC 6/6] perf build: Introduce FEATURES_DUMP make variable
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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.