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workqueue: make sysfs of unbound kworker cpumask more clever

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[ Upstream commit d25302e46592c97d29f70ccb1be558df31a9a360 ]

Some unfriendly component, such as dpdk, write the same mask to
unbound kworker cpumask again and again. Every time it write to
this interface some work is queue to cpu, even though the mask
is same with the original mask.

So, fix it by return success and do nothing if the cpumask is
equal with the old one.

Signed-off-by: Mengen Sun <mengensun@tencent.com>
Signed-off-by: Menglong Dong <imagedong@tencent.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Menglong Dong 2021-10-17 20:04:02 +08:00 committed by Greg Kroah-Hartman
parent ab5c46f258
commit 5736f1dead
1 changed files with 11 additions and 4 deletions
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15
kernel/workqueue.c
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@ -5326,9 +5326,6 @@ int workqueue_set_unbound_cpumask(cpumask_var_t cpumask)
int ret = -EINVAL;
cpumask_var_t saved_cpumask;
if (!zalloc_cpumask_var(&saved_cpumask, GFP_KERNEL))
return -ENOMEM;
/*
* Not excluding isolated cpus on purpose.
* If the user wishes to include them, we allow that.
@ -5336,6 +5333,15 @@ int workqueue_set_unbound_cpumask(cpumask_var_t cpumask)
cpumask_and(cpumask, cpumask, cpu_possible_mask);
if (!cpumask_empty(cpumask)) {
apply_wqattrs_lock();
if (cpumask_equal(cpumask, wq_unbound_cpumask)) {
ret = 0;
goto out_unlock;
}
if (!zalloc_cpumask_var(&saved_cpumask, GFP_KERNEL)) {
ret = -ENOMEM;
goto out_unlock;
}
/* save the old wq_unbound_cpumask. */
cpumask_copy(saved_cpumask, wq_unbound_cpumask);
@ -5348,10 +5354,11 @@ int workqueue_set_unbound_cpumask(cpumask_var_t cpumask)
if (ret < 0)
cpumask_copy(wq_unbound_cpumask, saved_cpumask);
free_cpumask_var(saved_cpumask);
out_unlock:
apply_wqattrs_unlock();
}
free_cpumask_var(saved_cpumask);
return ret;
}