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SubjectRe: [PATCH] sched: Provide a pointer to the valid CPU mask
On 2019-04-23 16:26:36 [+0200], To linux-kernel@vger.kernel.org wrote:
> In commit 4b53a3412d66 ("sched/core: Remove the tsk_nr_cpus_allowed()
> wrapper") the tsk_nr_cpus_allowed() wrapper was removed. There was not
> much difference in !RT but in RT we used this to implement
> migrate_disable(). Within a migrate_disable() section the CPU mask is
> restricted to single CPU while the "normal" CPU mask remains untouched.
>
> As an alternative implementation Ingo suggested to use
> struct task_struct {
> const cpumask_t *cpus_ptr;
> cpumask_t cpus_mask;
> };
> with
> t->cpus_allowed_ptr = &t->cpus_allowed;
>
> In -RT we then can switch the cpus_ptr to
> t->cpus_allowed_ptr = &cpumask_of(task_cpu(p));
>
> in a migration disabled region. The rules are simple:
> - Code that 'uses' ->cpus_allowed would use the pointer.
> - Code that 'modifies' ->cpus_allowed would use the direct mask.
>
> I proposed this patch as a series earlier and it was shutdown due to the
> migrate_disable() bits. It has been said that migrate_disable() should
> only be used with RT and thus not introduced without it.
> I hereby propose only the mask CPU-bits.
>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@kernel.org>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

a gentle ping.

Sebastian

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