On Thu, Apr 02, 2015 at 03:11:20PM -0400, Rik van Riel wrote:
> On 04/02/2015 03:09 PM, Peter Zijlstra wrote:
> > On Thu, Apr 02, 2015 at 07:39:24PM +0200, Frederic Weisbecker wrote:
> >> TIF_NOHZ is used by context_tracking to force syscall slow-path on every
> >> task in order to track userspace
On Thu, Apr 02, 2015 at 08:08:03PM +0200, Oleg Nesterov wrote:
> On 04/02, Frederic Weisbecker wrote:
> >
> > +void context_tracking_cpu_set(int cpu)
> > {
> > - clear_tsk_thread_flag(prev, TIF_NOHZ);
> > - set_tsk_thread_flag(next, TIF_NOHZ);
> > + static bool initialized = false;
> > + s
On 04/02, Peter Zijlstra wrote:
>
> On Thu, Apr 02, 2015 at 07:39:24PM +0200, Frederic Weisbecker wrote:
> > TIF_NOHZ is used by context_tracking to force syscall slow-path on every
> > task in order to track userspace roundtrips. As such, it must be set on
> > all running tasks.
> >
> > It's curre
On 04/02/2015 03:09 PM, Peter Zijlstra wrote:
> On Thu, Apr 02, 2015 at 07:39:24PM +0200, Frederic Weisbecker wrote:
>> TIF_NOHZ is used by context_tracking to force syscall slow-path on every
>> task in order to track userspace roundtrips. As such, it must be set on
>> all running tasks.
>>
>> It'
On Thu, Apr 02, 2015 at 07:39:24PM +0200, Frederic Weisbecker wrote:
> TIF_NOHZ is used by context_tracking to force syscall slow-path on every
> task in order to track userspace roundtrips. As such, it must be set on
> all running tasks.
>
> It's currently explicitly inherited through context swi
On 04/02, Frederic Weisbecker wrote:
>
> +void context_tracking_cpu_set(int cpu)
> {
> - clear_tsk_thread_flag(prev, TIF_NOHZ);
> - set_tsk_thread_flag(next, TIF_NOHZ);
> + static bool initialized = false;
> + struct task_struct *p, *t;
> + unsigned long flags;
> +
> + if (
On 04/02/2015 01:39 PM, Frederic Weisbecker wrote:
> TIF_NOHZ is used by context_tracking to force syscall slow-path on every
> task in order to track userspace roundtrips. As such, it must be set on
> all running tasks.
>
> It's currently explicitly inherited through context switches. There is
>
TIF_NOHZ is used by context_tracking to force syscall slow-path on every
task in order to track userspace roundtrips. As such, it must be set on
all running tasks.
It's currently explicitly inherited through context switches. There is
no need to do it on this fast-path though. The flag could be si
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