linux-kernel - Re: [PATCH v2] locking/pvqspinlock: restore/set vcpu_hashed state after failing adaptive locking spinning

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Message-ID: <20160714112648.GG30909@twins.programming.kicks-ass.net>
Date:	Thu, 14 Jul 2016 13:26:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Wanpeng Li <kernellwp@...il.com>
Cc:	linux-kernel@...r.kernel.org, Wanpeng Li <wanpeng.li@...mail.com>,
	Ingo Molnar <mingo@...nel.org>,
	Waiman Long <Waiman.Long@....com>,
	Davidlohr Bueso <dave@...olabs.net>
Subject: Re: [PATCH v2] locking/pvqspinlock: restore/set vcpu_hashed state
 after failing adaptive locking spinning

On Thu, Jul 14, 2016 at 04:15:56PM +0800, Wanpeng Li wrote:
> In this case, lock holder inserts the pv_node of queue head into the 
> hash table and set _Q_SLOW_VAL unnecessary. This patch avoids it by 
> restoring/setting vcpu_halted state after failing adaptive locking 
                        ^^^^^^
> spinning.
> 

> -		WRITE_ONCE(pn->state, vcpu_halted);
> +		WRITE_ONCE(pn->state, vcpu_hashed);
                                           ^^^^^^

The Changelog meant so say vcpu_hashed, surely?