linux-kernel - [PATCH v2] workqueue: respect isolated cpus when queueing an unbound work

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Date:   Sat, 21 Oct 2017 19:29:24 +0300
From:   Tal Shorer <tal.shorer@...il.com>
To:     tj@...nel.org, jiangshanlai@...il.com, linux-kernel@...r.kernel.org
Cc:     Tal Shorer <tal.shorer@...il.com>
Subject: [PATCH v2] workqueue: respect isolated cpus when queueing an unbound work

Initialize wq_unbound_cpumask to exclude cpus that were isolated by
the cmdline's isolcpus parameter.

Signed-off-by: Tal Shorer <tal.shorer@...il.com>
---
 kernel/workqueue.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index ca937b0..0add5d4 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4947,6 +4947,10 @@ int workqueue_set_unbound_cpumask(cpumask_var_t 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.
+	 */
 	cpumask_and(cpumask, cpumask, cpu_possible_mask);
 	if (!cpumask_empty(cpumask)) {
 		apply_wqattrs_lock();
@@ -5546,7 +5550,7 @@ int __init workqueue_init_early(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);
+	cpumask_andnot(wq_unbound_cpumask, cpu_possible_mask, cpu_isolated_map);
 
 	pwq_cache = KMEM_CACHE(pool_workqueue, SLAB_PANIC);
 
-- 
2.7.4