Frederic Weisbecker <fweis...@gmail.com> writes:
> Create a cpumask that limit the affinity of all unbound workqueues.
> This cpumask is controlled though a file at the root of the workqueue
> sysfs directory.
>
> It works on a lower-level than the per WQ_SYSFS workqueues cpumask files
> such that the effective cpumask applied for a given unbound workqueue is
> the intersection of /sys/devices/virtual/workqueue/$WORKQUEUE/cpumask and
> the new /sys/devices/virtual/workqueue/cpumask_unbounds file.
>
> This patch implements the basic infrastructure and the read interface.
> cpumask_unbounds is initially set to cpu_possible_mask.
For a nice default in the nohz_full case, how about this defaults to
!tick_nohz_full_mask? ...
[...]
> @@ -5033,6 +5055,9 @@ static int __init init_workqueues(void)
>
> WARN_ON(__alignof__(struct pool_workqueue) < __alignof__(long long));
>
> + BUG_ON(!alloc_cpumask_var(&wq_unbound_cpumask, GFP_KERNEL));
> + cpumask_copy(wq_unbound_cpumask, cpu_possible_mask);
> +
... so, something like this instead:
#ifdef CONFIG_NO_HZ_FULL
cpumask_complement(wq_unbound_cpumask, tick_nohz_full_mask);
#else
cpumask_copy(wq_unbound_cpumask, cpu_possible_mask);
#endif
Kevin
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
