linux-kernel - Re: [PATCH] locking/osq: Drop the overload of osq lock

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Message-Id: <FE2371CB-76A3-40E1-8994-0DFE00EFFFB3@linux.vnet.ibm.com>
Date:	Sun, 26 Jun 2016 12:59:01 +0800
From:	panxinhui <xinhui@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	panxinhui <xinhui@...ux.vnet.ibm.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, mingo@...hat.com, dave@...olabs.net,
	will.deacon@....com, Waiman.Long@....com, benh@...nel.crashing.org
Subject: Re: [PATCH] locking/osq: Drop the overload of osq lock


> 在 2016年6月26日，03:12，Peter Zijlstra <peterz@...radead.org> 写道：
> 
> On Sun, Jun 26, 2016 at 01:27:51AM +0800, panxinhui wrote:
> 
>> by the way I still think mutex_unlock has a big overload too. 
> 
> Do you mean overhead?
> 
oh, maybe you are right. 
mutex_unlock ’s implementation uses inc_return variant on  ppc, and that’s expensive. I am thinking of using  cmpxchg instead.