linux-kernel - Re: [PATCH RESEND v4 0/6] powerPC/pSeries use pv-qpsinlock as the default spinlock implemention

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Message-ID: <1464848612.19646.5.camel@ellerman.id.au>
Date:	Thu, 02 Jun 2016 16:23:32 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.orgv,
	irtualization@...ts.linux-foundation.org
Cc:	benh@...nel.crashing.org, paulus@...ba.org, peterz@...radead.org,
	mingo@...hat.com, paulmck@...ux.vnet.ibm.com, waiman.long@....com
Subject: Re: [PATCH RESEND v4 0/6] powerPC/pSeries use pv-qpsinlock as the
 default spinlock implemention

On Thu, 2016-06-02 at 13:03 +0800, Pan Xinhui wrote:

> change from v3:
> 	a big change in [PATCH v4 4/6] pv-qspinlock: powerpc support pv-qspinlock
> 	no other patch changed.
> 	and the patch cover letter tilte has changed as only pseries may need use pv-qspinlock, not all powerpc.
> 
> 	1) __pv_wait will not return until *ptr != val as Waiman gives me a tip.
> 	2) support lock holder serching by storing cpu number into a hash table(implemented as an array)
> 	This is because lock_stealing hit too much, up to 10%~20% of all the successful lock(), and avoid
> 	vcpu slices bounce.


You sent v4 last night, why did you resend again?

RESEND usually means "I sent this a while ago and got no response so here it is again".

cheers