On Thu, Jun 09, 2016 at 07:36:40PM +0200, Peter Zijlstra wrote:
> On Thu, Jun 09, 2016 at 03:40:58PM +0100, David Howells wrote:
> > Peter Zijlstra wrote:
> >
> > > Blergh; so looking at more asm there's still a few tricks we cannot do.
> > > So while overall size is down, some paths do end up mo
Hello!
We have a question about DEC Alpha memory ordering. Given the litmus test
shown at the end of this email, some of us believe that DEC Alpha won't
ever have both P0()'s and P1()'s READ_ONCE() calls return 1, but others
believe otherwise. Our current Linux-kernel memory model assumes that
i
On Mon, Feb 13, 2017 at 01:53:27PM -0500, bob smith wrote:
> On 2/13/17 1:39 PM, Paul E. McKenney wrote:
> > can real DEC Alpha hardware end up with both instances of "r1"
> > having the value 1?
>
> I thought this question reminded me of something, so I found this:
On Mon, Feb 13, 2017 at 08:14:23PM +0100, Tobias Klausmann wrote:
> Hi!
>
> On Mon, 13 Feb 2017, Paul E. McKenney wrote:
> > On Mon, Feb 13, 2017 at 01:53:27PM -0500, bob smith wrote:
> > > On 2/13/17 1:39 PM, Paul E. McKenney wrote:
> > > > can real DEC Alpha
On Tue, Feb 14, 2017 at 08:23:34AM +1300, Michael Cree wrote:
> Hi Paul,
>
> On Mon, Feb 13, 2017 at 11:09:31AM -0800, Paul E. McKenney wrote:
> > On Mon, Feb 13, 2017 at 01:53:27PM -0500, bob smith wrote:
> > > On 2/13/17 1:39 PM, Paul E. McKenney wrote:
> > >
On Mon, Feb 13, 2017 at 04:06:21PM -0500, Alan Stern wrote:
> On Mon, 13 Feb 2017, Paul E. McKenney wrote:
>
> > On Mon, Feb 13, 2017 at 08:14:23PM +0100, Tobias Klausmann wrote:
> > > Hi!
> > >
> > > On Mon, 13 Feb 2017, Paul E. McKenney wrote:
> >
There is no agreed-upon definition of spin_unlock_wait()'s semantics,
and it appears that all callers could do just as well with a lock/unlock
pair. This commit therefore removes the underlying arch-specific
arch_spin_unlock_wait().
Signed-off-by: Paul E. McKenney
Cc: Richard Henderso
On Thu, Sep 28, 2017 at 09:45:35AM +0100, Will Deacon wrote:
> On Thu, Sep 28, 2017 at 10:38:01AM +0200, Peter Zijlstra wrote:
> > On Wed, Sep 27, 2017 at 04:49:28PM +0100, Will Deacon wrote:
> > > In many cases, page tables can be accessed concurrently by either another
> > > CPU (due to things li
On Thu, Sep 28, 2017 at 04:49:54PM +0100, Will Deacon wrote:
> On Thu, Sep 28, 2017 at 08:43:54AM -0700, Paul E. McKenney wrote:
> > On Thu, Sep 28, 2017 at 09:45:35AM +0100, Will Deacon wrote:
> > > On Thu, Sep 28, 2017 at 10:38:01AM +0200, Peter Zijlstra wrote:
> > > &
On Fri, Sep 29, 2017 at 07:59:09AM +1300, Michael Cree wrote:
> On Thu, Sep 28, 2017 at 08:43:54AM -0700, Paul E. McKenney wrote:
> > On Thu, Sep 28, 2017 at 09:45:35AM +0100, Will Deacon wrote:
> > > On Thu, Sep 28, 2017 at 10:38:01AM +0200, Peter Zijlstra wrote:
> > >
On Fri, Sep 29, 2017 at 10:08:43AM +0100, Will Deacon wrote:
> On Thu, Sep 28, 2017 at 05:58:30PM -0700, Paul E. McKenney wrote:
> > On Fri, Sep 29, 2017 at 07:59:09AM +1300, Michael Cree wrote:
> > > On Thu, Sep 28, 2017 at 08:43:54AM -0700, Paul E. McKenney wrote:
> > >
On Fri, Sep 29, 2017 at 05:33:49PM +0100, Will Deacon wrote:
> On Fri, Sep 29, 2017 at 09:29:39AM -0700, Paul E. McKenney wrote:
> > On Fri, Sep 29, 2017 at 10:08:43AM +0100, Will Deacon wrote:
> > > On Thu, Sep 28, 2017 at 05:58:30PM -0700, Paul E. McKenney wrote:
> > >
On Thu, Oct 05, 2017 at 05:31:54PM +0100, Will Deacon wrote:
> Hi Paul,
>
> On Tue, Oct 03, 2017 at 12:11:10PM -0700, Paul E. McKenney wrote:
> > On Fri, Sep 29, 2017 at 05:33:49PM +0100, Will Deacon wrote:
> > > On Fri, Sep 29, 2017 at 09:29:39AM -0700, Paul E. McKenn
Oct 03, 2017 at 12:11:10PM -0700, Paul E. McKenney wrote:
> > > On Fri, Sep 29, 2017 at 05:33:49PM +0100, Will Deacon wrote:
> > > > On Fri, Sep 29, 2017 at 09:29:39AM -0700, Paul E. McKenney wrote:
> > > > > On Fri, Sep 29, 2017 at 10:08:43AM +0100, Will Deacon
Hello, Michael,
Do any of the DEC Alpha systems that run recent kernels have InfiniBand?
Given my understanding of the history, I believe the answer to be "no".
If I am wrong, please let me know, as I will otherwise interpret silence
as assent. ;-)
On Fri, Oct 20, 2017 at 01:00:14PM -0700, Matt Turner wrote:
> On Fri, Oct 20, 2017 at 12:48 PM, Paul E. McKenney
> wrote:
> > Hello, Michael,
> >
> > Do any of the DEC Alpha systems that run recent kernels have InfiniBand?
> > Given my understanding of the history,
On Mon, Oct 23, 2017 at 09:59:21PM +1300, Michael Cree wrote:
> On Fri, Oct 20, 2017 at 12:48:32PM -0700, Paul E. McKenney wrote:
> > Do any of the DEC Alpha systems that run recent kernels have InfiniBand?
> > Given my understanding of the history, I believe the answer to be &quo
On Mon, Oct 23, 2017 at 06:16:25PM +0100, Will Deacon wrote:
> On Mon, Oct 23, 2017 at 10:13:12AM -0700, Paul E. McKenney wrote:
> > On Mon, Oct 23, 2017 at 09:59:21PM +1300, Michael Cree wrote:
> > > On Fri, Oct 20, 2017 at 12:48:32PM -0700, Paul E. McKenney wrote:
> > >
is bug-for-bug compatible with the original.
Signed-off-by: Paul E. McKenney
Cc: Doug Ledford
Cc: Jason Gunthorpe
Cc: Richard Henderson
Cc: Ivan Kokshaysky
Cc: Matt Turner
Cc: Michael Cree
Cc: Andrea Parri
Cc:
Cc:
---
drivers/dma/ioat/dma.c | 2 --
drivers/infiniba
On Fri, Dec 01, 2017 at 05:11:09PM -0700, Jason Gunthorpe wrote:
> On Fri, Dec 01, 2017 at 11:51:11AM -0800, Paul E. McKenney wrote:
> > The smp_read_barrier_depends() does nothing at all except on DEC Alpha,
> > and no current DEC Alpha systems use Infiniband:
> >
>
On Tue, Dec 05, 2017 at 08:08:32AM -0700, Jason Gunthorpe wrote:
> > commit c389c98ec5f4a7aa4c36853e89801eb5ea81870e
> > Author: Paul E. McKenney
> > Date: Mon Nov 27 09:04:22 2017 -0800
> >
> > drivers/infiniband: Remove now-redundant smp_read_barrier_
gt; https://marc.info/?l=linux-kernel&m=151215810824468&w=2
> https://marc.info/?l=linux-kernel&m=151215816324484&w=2
>
> [2] https://marc.info/?l=linux-kernel&m=151881978314872&w=2
>
> Signed-off-by: Andrea Parri
> Acked-by: Peter Zijlstra
> Cc:
gested-by: Will Deacon
> Signed-off-by: Andrea Parri
I am a bit confused by the use of out-of-line branches to do a backwards
branch, but those were in place to start with. Maybe the point is to
defeat backwards-branch prediction or some such.
Regardless...
Acked-by: Paul E. McKenney
> Cc:
t; > WRITE_ONCE(x, 1)
> > xchg(y, 1)
> >
> > smp_load_acquire(y) == 1
> > READ_ONCE(x) == 0
> >
> > would be allowed.
>
> (thus violating the above requirement). Amend this by adding a
> leading smp_mb() to the implementations of xchg(), cmpxchg().
>
> Re
On Mon, Jan 07, 2019 at 08:36:36AM -0500, Michael S. Tsirkin wrote:
> On Mon, Jan 07, 2019 at 10:46:10AM +0100, Peter Zijlstra wrote:
> > On Sun, Jan 06, 2019 at 11:23:07PM -0500, Michael S. Tsirkin wrote:
> > > On Mon, Jan 07, 2019 at 11:58:23AM +0800, Jason Wang wrote:
> > > > On 2019/1/3 上午4:57,
On Mon, Jan 07, 2019 at 02:13:29PM -0500, Michael S. Tsirkin wrote:
> On Mon, Jan 07, 2019 at 11:02:36AM -0800, Paul E. McKenney wrote:
> > On Mon, Jan 07, 2019 at 08:36:36AM -0500, Michael S. Tsirkin wrote:
> > > On Mon, Jan 07, 2019 at 10:46:10AM +0100, Peter Zijlstra wrote:
&
Commit-ID: adf90eb49055636fc35aede54174456ac3520f27
Gitweb: https://git.kernel.org/tip/adf90eb49055636fc35aede54174456ac3520f27
Author: Paul E. McKenney
AuthorDate: Mon, 27 Nov 2017 09:04:22 -0800
Committer: Paul E. McKenney
CommitDate: Tue, 5 Dec 2017 11:56:54 -0800
drivers
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