Thomas Gleixner writes:
> On Wed, 10 May 2017, Michael Ellerman wrote:
>
>> Thomas Gleixner writes:
>>
>> > @@ -130,6 +130,7 @@ void __static_key_slow_inc(struct static
>> > * the all CPUs, for that to be serialized against CPU hot-plug
>> > * we need to avoid CPUs coming online.
>> >
On Wed, 10 May 2017 12:30:57 -0400
Steven Rostedt wrote:
> I finally got some time to look at this. I'm looking at your commit:
>
> commit b53e5129c4c7ab47ec4f709fd8f5784ca45fb46d
> Author: Thomas Gleixner
> Date: Sun Apr 23 12:17:13 2017 +0200
>
> trace/perf: Cure hotplug lock orderin
On Wed, 10 May 2017 10:49:09 +0200 (CEST)
Thomas Gleixner wrote:
> On Wed, 10 May 2017, Michael Ellerman wrote:
>
> > Thomas Gleixner writes:
> >
> > > @@ -130,6 +130,7 @@ void __static_key_slow_inc(struct static
> > >* the all CPUs, for that to be serialized against CPU hot-plug
> > >
On Wed, 10 May 2017, Michael Ellerman wrote:
> Thomas Gleixner writes:
>
> > @@ -130,6 +130,7 @@ void __static_key_slow_inc(struct static
> > * the all CPUs, for that to be serialized against CPU hot-plug
> > * we need to avoid CPUs coming online.
> > */
> > + lockdep_assert_hot
Thomas Gleixner writes:
> @@ -130,6 +130,7 @@ void __static_key_slow_inc(struct static
>* the all CPUs, for that to be serialized against CPU hot-plug
>* we need to avoid CPUs coming online.
>*/
> + lockdep_assert_hotplug_held();
> jump_label_lock();
> if (
There are no more (known) nested calls to get_online_cpus() so it's
possible to remove the nested call magic and convert the mutex to a
percpu-rwsem, which speeds up get/put_online_cpus() significantly for the
uncontended case.
The contended case (write locked for hotplug operations) is slow anywa
6 matches
Mail list logo
