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

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Message-ID: <20160112135016.247c6ca5@lxorguk.ukuu.org.uk>
Date:	Tue, 12 Jan 2016 13:50:16 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Ling Ma <ling.ma.program@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Waiman Long <waiman.long@....com>, 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

On Sat, 9 Jan 2016 06:44:15 +0800
Ling Ma <ling.ma.program@...il.com> wrote:

> The attachment (alispinlock.tar.bz2) includes original spinlock and
> alispinlock ,
> we compare them on 70 cores based on kernel 4.3, the alispinlock can
> improve performance upto 3x.
> 
> the link: https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1035940.html
> indicates when we introduce the idea for real application(user space
> application  caused the bottle neck from  kernel spinlock )
> the spinlock performance is improved by 1.9x (perf top -d1 also tell
> us the spinlock cost time is reduced from 25% to 15%).
> 
> Appreciate your comments

So this has not been applied to actual real kernel locks (ie converted
some of the hot kernel locks to it) and then benchmarked with a real
world workload. This is just for the theoretical locking overhead ?

Alan