linux-kernel - Re: [RFC PATCH] qspinlock: Improve performance by reducing load instruction rollback

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Date:	Tue, 20 Oct 2015 10:48:56 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Ling Ma <ling.ma.program@...il.com>
Cc:	peterz@...radead.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org, Ma Ling <ling.ml@...baba-inc.com>,
	Waiman.Long@....com
Subject: Re: [RFC PATCH] qspinlock: Improve performance by reducing load
 instruction rollback


* Ling Ma <ling.ma.program@...il.com> wrote:

> > So it would be nice to create a new user-space spinlock testing facility, via 
> > a new 'perf bench spinlock' feature or so. That way others can test and 
> > validate your results on different hardware as well.
>
> Attached the spinlock test module . Queued spinlock will run very slowly in user 
> space because process switch context, it is OK for spinlock-test implementation 
> with kernel module ?

Not sure what you mean by 'because process switch context': if you pin the test 
tasks to individual CPUs and make sure there's nothing else running it should be 
equivalent to kernel-space execution.

Thanks,

	Ingo
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