linux-kernel - Re: [RFC PATCH] alispinlock: acceleration from lock integration on multi-core platform

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Message-ID: <CAOGi=dPSyUc269DzUegTZYMXud+uzoET6fraK40jAHbMNzJv0Q@mail.gmail.com>
Date:	Tue, 5 Apr 2016 11:44:06 +0800
From:	Ling Ma <ling.ma.program@...il.com>
To:	Waiman Long <waiman.long@....com>
Cc:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Ling <ling.ml@...baba-inc.com>
Subject: Re: [RFC PATCH] alispinlock: acceleration from lock integration on
 multi-core platform

Hi Longman,

> with some modest increase in performance. That can be hard to justify. Maybe
> you should find other use cases that involve less changes, but still have
> noticeable performance improvement. That will make it easier to be accepted.

The attachment is for other use case with the new lock optimization.
It include two files: main.c (user space workload),
fcntl-lock-opt.patch (kernel patch on 4.3.0-rc4 version)
(The hardware platform is on Intel E5 2699 V3, 72 threads (18core *2Socket *2HT)

1. when we run a.out from main.c on original 4.3.0-rc4 version,
the average throughput from a.out is 1887592( 98% cpu cost from perf top -d1)

2. when we run a.out from main.c with the fcntl-lock-opt.patch ,
the average throughput from a.out is 5277281 (91% cpu cost from perf top -d1)

So we say the new mechanism give us about 2.79x (5277281 / 1887592) improvement.

Appreciate your comments.

Thanks
Ling

Download attachment "test-lock.tar" of type "application/x-tar" (30720 bytes)