On 03/14/2015 07:49 AM, Kevin Hilman wrote: > Lai Jiangshan <la...@cn.fujitsu.com> writes: > >> From: Frederic Weisbecker <fweis...@gmail.com> >> >> 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. >> >> Cc: Christoph Lameter <c...@linux.com> >> Cc: Kevin Hilman <khil...@linaro.org> >> Cc: Lai Jiangshan <la...@cn.fujitsu.com> >> Cc: Mike Galbraith <bitbuc...@online.de> >> Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com> >> Cc: Tejun Heo <t...@kernel.org> >> Cc: Viresh Kumar <viresh.ku...@linaro.org> >> Signed-off-by: Frederic Weisbecker <fweis...@gmail.com> >> Signed-off-by: Lai Jiangshan <la...@cn.fujitsu.com> > > [...] > >> @@ -5094,6 +5116,9 @@ 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); >> + > > As I mentioned in an earlier discussion[1], I still think this could > default too the housekeeping CPUs in the NO_HZ_FULL case: > > #ifdef CONFIG_NO_HZ_FULL > cpumask_complement(wq_unbound_cpumask, tick_nohz_full_mask);
No, the default/booted wq_unbound_cpumask should be cpu_possible_mask. > #else > cpumask_copy(wq_unbound_cpumask, cpu_possible_mask); > #endif > > But that could also be left to a future optimization as well. > > Kevin > > [1] https://lkml.org/lkml/2014/2/14/666 > . > -- 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/
