On Wed, 2015-04-29 at 21:44 +0200, Manfred Spraul wrote:
> Hi Davidlohr,
>
> On 04/28/2015 06:59 PM, Davidlohr Bueso wrote:
> > On Tue, 2015-04-28 at 18:43 +0200, Peter Zijlstra wrote:
> >> Well, if you can 'guarantee' the cmpxchg will not fail, you can then
> >> rely on the fact that cmpxchg impl
Hi Davidlohr,
On 04/28/2015 06:59 PM, Davidlohr Bueso wrote:
On Tue, 2015-04-28 at 18:43 +0200, Peter Zijlstra wrote:
Well, if you can 'guarantee' the cmpxchg will not fail, you can then
rely on the fact that cmpxchg implies a full barrier, which would
obviate the need for the wmb.
Yes, assumi
On Tue, 2015-04-28 at 18:43 +0200, Peter Zijlstra wrote:
> Well, if you can 'guarantee' the cmpxchg will not fail, you can then
> rely on the fact that cmpxchg implies a full barrier, which would
> obviate the need for the wmb.
Yes, assuming it implies barriers on both sides. And we could obviousl
On Tue, Apr 28, 2015 at 09:36:50AM -0700, Davidlohr Bueso wrote:
> On Tue, 2015-04-28 at 14:37 +0200, Peter Zijlstra wrote:
> > On Mon, Apr 27, 2015 at 08:24:53PM -0700, Davidlohr Bueso wrote:
> > > +static inline void pipelined_send(struct wake_q_head *wake_q,
> > > + str
On Tue, 2015-04-28 at 14:37 +0200, Peter Zijlstra wrote:
> On Mon, Apr 27, 2015 at 08:24:53PM -0700, Davidlohr Bueso wrote:
> > +static inline void pipelined_send(struct wake_q_head *wake_q,
> > + struct mqueue_inode_info *info,
> > struct m
On Mon, Apr 27, 2015 at 08:24:53PM -0700, Davidlohr Bueso wrote:
> +static inline void pipelined_send(struct wake_q_head *wake_q,
> + struct mqueue_inode_info *info,
> struct msg_msg *message,
> struct ext
On Fri, 2015-04-24 at 00:18 +0200, Thomas Gleixner wrote:
> Can you please convert that over to Peters lockless wake queues so we
> do not reimplement the same thing open coded here.
So I'd like to include this in my v2 of the wake_q stuff, along with the
futex conversion. What do you guys think o
On Fri, 10 Apr 2015, Sebastian Andrzej Siewior wrote:
> >And: please test it, too. (patch the kernel so that you can trigger
> >this case).
>
> Why patch? Isn't this triggered if you have a reader waiting and you
> send a message?
Manfred referred to the exit race. Though you can spare that exerc
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