On 13/03/15 18:14, Benjamin Herrenschmidt wrote:
> On Fri, 2015-03-13 at 18:09 +1100, Michael Ellerman wrote:
>> On Thu, 2015-03-12 at 22:13 +1100, Benjamin Herrenschmidt wrote:
>>> On Thu, 2015-03-12 at 18:55 +0800, Kevin Hao wrote:
I know Torsten Duwe has tried to add the ticket spinlock for
On Fri, 2015-03-13 at 18:09 +1100, Michael Ellerman wrote:
> On Thu, 2015-03-12 at 22:13 +1100, Benjamin Herrenschmidt wrote:
> > On Thu, 2015-03-12 at 18:55 +0800, Kevin Hao wrote:
> > > I know Torsten Duwe has tried to add the ticket spinlock for powerpc
> > > one year ago [1]. But it make no pro
On Thu, 2015-03-12 at 22:13 +1100, Benjamin Herrenschmidt wrote:
> On Thu, 2015-03-12 at 18:55 +0800, Kevin Hao wrote:
> > I know Torsten Duwe has tried to add the ticket spinlock for powerpc
> > one year ago [1]. But it make no progress due to the conflict between
> > PPC_SPLPAR and lockref. We st
On Fri, 2015-03-13 at 14:09 +0800, Kevin Hao wrote:
> On Thu, Mar 12, 2015 at 04:24:10PM +0100, Torsten Duwe wrote:
> > But generally, which platforms would benefit most from this change?
>
> In theory, the more cpus the platform has, the more serious the thundering
> herd problem is. So the lates
On Thu, Mar 12, 2015 at 04:24:10PM +0100, Torsten Duwe wrote:
> But generally, which platforms would benefit most from this change?
In theory, the more cpus the platform has, the more serious the thundering
herd problem is. So the latest platforms which has more cpus would benefit
most.
Thanks,
K
On Thu, Mar 12, 2015 at 10:13:27PM +1100, Benjamin Herrenschmidt wrote:
> I would do the ifdef'ing differently, something like
>
> CONFIG_PPC_HAS_LOCK_OWNER
>
> CONFIG_PPC_TICKET_LOCKS depends on !PPC_HAS_LOCK_OWNER
>
> and use these two in the code... with SPLPAR select'ing HAS_LOCK_OWNER
OK,
On Thu, Mar 12, 2015 at 10:13:27PM +1100, Benjamin Herrenschmidt wrote:
> On Thu, 2015-03-12 at 18:55 +0800, Kevin Hao wrote:
> > I know Torsten Duwe has tried to add the ticket spinlock for powerpc
> > one year ago [1]. But it make no progress due to the conflict between
OMG, time flies.
> > PPC
On Thu, 2015-03-12 at 18:55 +0800, Kevin Hao wrote:
> I know Torsten Duwe has tried to add the ticket spinlock for powerpc
> one year ago [1]. But it make no progress due to the conflict between
> PPC_SPLPAR and lockref. We still don't find a better way to handle
> this. But instead of waiting fore
I know Torsten Duwe has tried to add the ticket spinlock for powerpc
one year ago [1]. But it make no progress due to the conflict between
PPC_SPLPAR and lockref. We still don't find a better way to handle
this. But instead of waiting forever for a perfect solution, can't we
just use the ticket spi
