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From: Peter Zijlstra <peterz@infradead.org>
To: Will Deacon <will.deacon@arm.com>
Cc: Waiman Long <waiman.long@hpe.com>,
	linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
	manfred@colorfullife.com, dave@stgolabs.net,
	paulmck@linux.vnet.ibm.com, boqun.feng@gmail.com, tj@kernel.org,
	pablo@netfilter.org, kaber@trash.net, davem@davemloft.net,
	oleg@redhat.com, netfilter-devel@vger.kernel.org,
	sasha.levin@oracle.com, hofrat@osadl.org
Subject: Re: [PATCH -v3 7/8] locking: Move smp_cond_load_acquire() and friends into asm-generic/barrier.h
Date: Wed, 1 Jun 2016 14:45:41 +0200	[thread overview]
Message-ID: <20160601124541.GS3190@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20160601121333.GC355@arm.com>

On Wed, Jun 01, 2016 at 01:13:33PM +0100, Will Deacon wrote:
> On Wed, Jun 01, 2016 at 02:06:54PM +0200, Peter Zijlstra wrote:

> > Works for me; but that would loose using cmpwait() for
> > !smp_cond_load_acquire() spins, you fine with that?
> > 
> > The two conversions in the patch were both !acquire spins.
> 
> Maybe we could go the whole hog and add smp_cond_load_relaxed?

What about say the cmpxchg loops in queued_write_lock_slowpath()
? Would that be something you'd like to use wfe for?

Writing those in smp_cond_load_{acquire,relaxed)() is somewhat possible
but quite ugleh.

  reply	other threads:[~2016-06-01 12:46 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-31  9:41 [PATCH -v3 0/8] spin_unlock_wait borkage and assorted bits Peter Zijlstra
2016-05-31  9:41 ` [PATCH -v3 1/8] locking: Replace smp_cond_acquire with smp_cond_load_acquire Peter Zijlstra
2016-05-31  9:41 ` [PATCH -v3 2/8] locking: Introduce cmpwait() Peter Zijlstra
2016-05-31  9:41 ` [PATCH -v3 3/8] locking: Introduce smp_acquire__after_ctrl_dep Peter Zijlstra
2016-06-01 13:52   ` Boqun Feng
2016-06-01 16:22     ` Peter Zijlstra
2016-06-01 23:19       ` Boqun Feng
2016-05-31  9:41 ` [PATCH -v3 4/8] locking, arch: Update spin_unlock_wait() Peter Zijlstra
2016-06-01 11:24   ` Will Deacon
2016-06-01 11:37     ` Peter Zijlstra
2016-05-31  9:41 ` [PATCH -v3 5/8] locking: Update spin_unlock_wait users Peter Zijlstra
2016-05-31  9:41 ` [PATCH -v3 6/8] locking,netfilter: Fix nf_conntrack_lock() Peter Zijlstra
2016-05-31  9:41 ` [PATCH -v3 7/8] locking: Move smp_cond_load_acquire() and friends into asm-generic/barrier.h Peter Zijlstra
2016-05-31 20:01   ` Waiman Long
2016-06-01  9:31     ` Peter Zijlstra
2016-06-01 12:00       ` Will Deacon
2016-06-01 12:06         ` Peter Zijlstra
2016-06-01 12:13           ` Will Deacon
2016-06-01 12:45             ` Peter Zijlstra [this message]
2016-06-01 14:07               ` Will Deacon
2016-06-01 17:13                 ` Peter Zijlstra
2016-06-01 16:53       ` Waiman Long
2016-05-31  9:41 ` [PATCH -v3 8/8] locking, tile: Provide TILE specific smp_acquire__after_ctrl_dep Peter Zijlstra
2016-05-31 15:32   ` Chris Metcalf

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