Messages in this thread | | | Date | Thu, 6 Apr 2017 11:46:35 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH] kernel: sched: Provide a pointer to the valid CPU mask |
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On Thu, Apr 06, 2017 at 11:25:42AM +0200, Sebastian Andrzej Siewior wrote: > > I.e. just have a counter and these two APIs: > > > > static inline void migrate_disable(void) > > { > > current->migration_disabled++; > plus > if (current->migration_disabled == 1) > get_online_cpus()
You want that other hotplug fast hack crap you have in rt, no? Because mainline will not get anything other than prempt_disable() for migrate_disable().
> > } > > > > ... > > > > static inline void migrate_enable(void) > > { > > current->migration_disabled--; > > } > > > > ... and make sure the scheduler migration code plus the CPU hotplug code considers > > the counter. > > So on the sched part I need go through all places where it looks at the > mask and make sure it ignores the CPU switch decision. This could be > doable.
Don't sprinkle that around. Use a wrapper like say: tsk_cpus_allowed() to encapsulate that logic :-)
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