linux-kernel - Re: [PATCH v3 0/6] powerpc use pv-qpsinlock as the default spinlock implemention

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Message-ID: <20160526165047.GM3206@twins.programming.kicks-ass.net>
Date:	Thu, 26 May 2016 18:50:47 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	virtualization@...ts.linux-foundation.org,
	benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
	mingo@...hat.com, paulmck@...ux.vnet.ibm.com, jeremy@...p.org,
	chrisw@...s-sol.org, akataria@...are.com, rusty@...tcorp.com.au
Subject: Re: [PATCH v3 0/6]  powerpc use pv-qpsinlock as the default spinlock
 implemention

On Wed, May 25, 2016 at 04:18:03PM +0800, Pan Xinhui wrote:

> _____test________________spinlcok______________pv-qspinlcok_____
> |futex hash	|	556370 ops	|	629634 ops	|
> |futex lock-pi	|	362 ops		|	367 ops		|
> 
> scheduler test:
> Test how many loops of schedule() can finish within 10 seconds on all cpus.
> 
> _____test________________spinlcok______________pv-qspinlcok_____
> |schedule() loops|	322811921 	|	311449290	|
> 
> kernel compiling test:
> build a linux kernel image to see how long it took
> 
> _____test________________spinlcok______________pv-qspinlcok_____
> | compiling takes|	22m 		|	22m		|


s/spinlcok/spinlock/

Is 'spinlcok' the current test-and-set lock?

And what about regular qspinlock, in case of !SHARED_PROCESSOR?