workqueue: Create low-level unbound workqueues cpumask
Create a cpumask that limits the affinity of all unbound workqueues. This cpumask is controlled through 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 file. This patch implements the basic infrastructure and the read interface. wq_unbound_cpumask is initially set to cpu_possible_mask. Cc: Christoph Lameter <cl@linux.com> Cc: Kevin Hilman <khilman@linaro.org> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Mike Galbraith <bitbucket@online.de> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Tejun Heo <tj@kernel.org> Cc: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -299,6 +299,8 @@ static DEFINE_SPINLOCK(wq_mayday_lock); /* protects wq->maydays list */
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static LIST_HEAD(workqueues); /* PR: list of all workqueues */
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static bool workqueue_freezing; /* PL: have wqs started freezing? */
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static cpumask_var_t wq_unbound_cpumask;
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/* the per-cpu worker pools */
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static DEFINE_PER_CPU_SHARED_ALIGNED(struct worker_pool [NR_STD_WORKER_POOLS],
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cpu_worker_pools);
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@ -3532,7 +3534,7 @@ apply_wqattrs_prepare(struct workqueue_struct *wq,
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/* make a copy of @attrs and sanitize it */
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copy_workqueue_attrs(new_attrs, attrs);
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cpumask_and(new_attrs->cpumask, new_attrs->cpumask, cpu_possible_mask);
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cpumask_and(new_attrs->cpumask, new_attrs->cpumask, wq_unbound_cpumask);
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/*
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* We may create multiple pwqs with differing cpumasks. Make a
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@ -4945,9 +4947,29 @@ static struct bus_type wq_subsys = {
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.dev_groups = wq_sysfs_groups,
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};
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static ssize_t wq_unbound_cpumask_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int written;
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written = scnprintf(buf, PAGE_SIZE, "%*pb\n",
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cpumask_pr_args(wq_unbound_cpumask));
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return written;
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}
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static struct device_attribute wq_sysfs_cpumask_attr =
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__ATTR(cpumask, 0444, wq_unbound_cpumask_show, NULL);
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static int __init wq_sysfs_init(void)
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{
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return subsys_virtual_register(&wq_subsys, NULL);
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int err;
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err = subsys_virtual_register(&wq_subsys, NULL);
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if (err)
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return err;
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return device_create_file(wq_subsys.dev_root, &wq_sysfs_cpumask_attr);
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}
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core_initcall(wq_sysfs_init);
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@ -5095,6 +5117,9 @@ static int __init init_workqueues(void)
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WARN_ON(__alignof__(struct pool_workqueue) < __alignof__(long long));
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BUG_ON(!alloc_cpumask_var(&wq_unbound_cpumask, GFP_KERNEL));
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cpumask_copy(wq_unbound_cpumask, cpu_possible_mask);
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pwq_cache = KMEM_CACHE(pool_workqueue, SLAB_PANIC);
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cpu_notifier(workqueue_cpu_up_callback, CPU_PRI_WORKQUEUE_UP);
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