gt; > involved.
>
> NP. Here's the current version I've got, with some updated likely()
> hints.
>
> From 337298a88266f7b21492f893c2bf05409a5392c8 Mon Sep 17 00:00:00 2001
> From: Matthew Wilcox
> Date: Mon, 20 Aug 2018 10:19:14 -0400
> Subject: [PATCH] lock
e updated likely()
hints.
>From 337298a88266f7b21492f893c2bf05409a5392c8 Mon Sep 17 00:00:00 2001
From: Matthew Wilcox
Date: Mon, 20 Aug 2018 10:19:14 -0400
Subject: [PATCH] locking: Remove an insn from spin and write locks
Both spin locks and write locks currently do:
f0 0f b1 17 l
On Mon, Aug 20, 2018 at 08:50:02AM -0700, Matthew Wilcox wrote:
> On Mon, Aug 20, 2018 at 11:14:04AM -0400, Waiman Long wrote:
> > On 08/20/2018 11:06 AM, Matthew Wilcox wrote:
> > > Both spin locks and write locks currently do:
> > >
> > > f0 0f b1 17 lock cmpxchg %edx,(%rdi)
> > > 8
On 08/20/2018 11:50 AM, Matthew Wilcox wrote:
> On Mon, Aug 20, 2018 at 11:14:04AM -0400, Waiman Long wrote:
>> On 08/20/2018 11:06 AM, Matthew Wilcox wrote:
>>> Both spin locks and write locks currently do:
>>>
>>> f0 0f b1 17 lock cmpxchg %edx,(%rdi)
>>> 85 c0 test
On Mon, Aug 20, 2018 at 11:14:04AM -0400, Waiman Long wrote:
> On 08/20/2018 11:06 AM, Matthew Wilcox wrote:
> > Both spin locks and write locks currently do:
> >
> > f0 0f b1 17 lock cmpxchg %edx,(%rdi)
> > 85 c0 test %eax,%eax
> > 75 05 jne
On 08/20/2018 11:06 AM, Matthew Wilcox wrote:
> Both spin locks and write locks currently do:
>
> f0 0f b1 17 lock cmpxchg %edx,(%rdi)
> 85 c0 test %eax,%eax
> 75 05 jne[slowpath]
>
> This 'test' insn is superfluous; the cmpxchg insn sets the
Both spin locks and write locks currently do:
f0 0f b1 17 lock cmpxchg %edx,(%rdi)
85 c0 test %eax,%eax
75 05 jne[slowpath]
This 'test' insn is superfluous; the cmpxchg insn sets the Z flag
appropriately. Peter pointed out that using atomi
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