linux-kernel - Re: [PATCH 13/14] x86/ticketlock: add slowpath logic

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Message-ID: <4CE3992E.2070406@redhat.com>
Date:	Wed, 17 Nov 2010 10:58:22 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Jan Beulich <JBeulich@...ell.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Eric Dumazet <dada1@...mosbay.com>, xiyou.wangcong@...il.com,
	Peter Zijlstra <peterz@...radead.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 13/14] x86/ticketlock: add slowpath logic

On 11/17/2010 10:52 AM, Jeremy Fitzhardinge wrote:
> On 11/17/2010 12:31 AM, Jan Beulich wrote:
> >>>>  On 16.11.10 at 22:08, Jeremy Fitzhardinge<jeremy@...p.org>  wrote:
> >>  +static inline void __ticket_enter_slowpath(struct arch_spinlock *lock)
> >>  +{
> >>  +	if (sizeof(lock->tickets.tail) == sizeof(u8))
> >>  +		asm (LOCK_PREFIX "orb %1, %0"
> >>  +		     : "+m" (lock->tickets.tail)
> >>  +		     : "i" (TICKET_SLOWPATH_FLAG) : "memory");
> >>  +	else
> >>  +		asm (LOCK_PREFIX "orw %1, %0"
> >>  +		     : "+m" (lock->tickets.tail)
> >>  +		     : "i" (TICKET_SLOWPATH_FLAG) : "memory");
> >>  +}
> >  Came only now to mind: Here and elsewhere, did you try using
> >  %z0 to have gcc produce the opcode suffix character, rather
> >  than having these somewhat ugly if()-s?
>
> Actually in this case I'm pretty sure there's already a "set bit"
> function which will do the job.  set_bit(), I guess, though it takes a
> bit number rather than a mask...
>

set_bit() operates on a long, while the intel manuals recommend against 
operating on operands of different size, especially with locked 
operations.  I think newer processors have more relaxed requirements, 
though.

-- 
error compiling committee.c: too many arguments to function

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