From: Peter Zijlstra <peterz@infradead.org>
To: Boqun Feng <boqun.feng@gmail.com>
Cc: linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
manfred@colorfullife.com, dave@stgolabs.net,
paulmck@linux.vnet.ibm.com, will.deacon@arm.com,
Waiman.Long@hpe.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 3/8] locking: Introduce smp_acquire__after_ctrl_dep
Date: Wed, 1 Jun 2016 18:22:55 +0200 [thread overview]
Message-ID: <20160601162255.GT3190@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20160601135214.GC30064@insomnia>
On Wed, Jun 01, 2016 at 09:52:14PM +0800, Boqun Feng wrote:
> On Tue, May 31, 2016 at 11:41:37AM +0200, Peter Zijlstra wrote:
> > @@ -292,7 +282,7 @@ static void sem_wait_array(struct sem_ar
> > sem = sma->sem_base + i;
> > spin_unlock_wait(&sem->lock);
> > }
> > - ipc_smp_acquire__after_spin_is_unlocked();
> > + smp_acquire__after_ctrl_dep();
>
> I wonder whether we can kill this barrier after updating
> spin_unlock_wait() to ACQUIRE?
See patch 5 doing that :-)
next prev parent reply other threads:[~2016-06-01 16:22 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 [this message]
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
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160601162255.GT3190@twins.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=Waiman.Long@hpe.com \
--cc=boqun.feng@gmail.com \
--cc=dave@stgolabs.net \
--cc=davem@davemloft.net \
--cc=hofrat@osadl.org \
--cc=kaber@trash.net \
--cc=linux-kernel@vger.kernel.org \
--cc=manfred@colorfullife.com \
--cc=netfilter-devel@vger.kernel.org \
--cc=oleg@redhat.com \
--cc=pablo@netfilter.org \
--cc=paulmck@linux.vnet.ibm.com \
--cc=sasha.levin@oracle.com \
--cc=tj@kernel.org \
--cc=torvalds@linux-foundation.org \
--cc=will.deacon@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.