Author: hselasky
Date: Wed Apr 19 11:38:07 2017
New Revision: 317135
URL: https://svnweb.freebsd.org/changeset/base/317135
Log:
Zero number of CPUs should be translated into the default number of
CPUs when allocating a LinuxKPI workqueue. This also ensures that the
created taskqueue always have a non-zero number of worker threads.
MFC after: 1 week
Sponsored by: Mellanox Technologies
Modified:
head/sys/compat/linuxkpi/common/src/linux_work.c
Modified: head/sys/compat/linuxkpi/common/src/linux_work.c
==============================================================================
--- head/sys/compat/linuxkpi/common/src/linux_work.c Wed Apr 19 11:13:32
2017 (r317134)
+++ head/sys/compat/linuxkpi/common/src/linux_work.c Wed Apr 19 11:38:07
2017 (r317135)
@@ -57,6 +57,8 @@ struct workqueue_struct *system_long_wq;
struct workqueue_struct *system_unbound_wq;
struct workqueue_struct *system_power_efficient_wq;
+static int linux_default_wq_cpus = 4;
+
static void linux_delayed_work_timer_fn(void *);
/*
@@ -497,6 +499,12 @@ linux_create_workqueue_common(const char
{
struct workqueue_struct *wq;
+ /*
+ * If zero CPUs are specified use the default number of CPUs:
+ */
+ if (cpus == 0)
+ cpus = linux_default_wq_cpus;
+
wq = kmalloc(sizeof(*wq), M_WAITOK | M_ZERO);
wq->taskqueue = taskqueue_create(name, M_WAITOK,
taskqueue_thread_enqueue, &wq->taskqueue);
@@ -537,6 +545,9 @@ linux_work_init(void *arg)
if (max_wq_cpus < 4)
max_wq_cpus = 4;
+ /* set default number of CPUs */
+ linux_default_wq_cpus = max_wq_cpus;
+
linux_system_short_wq = alloc_workqueue("linuxkpi_short_wq", 0,
max_wq_cpus);
linux_system_long_wq = alloc_workqueue("linuxkpi_long_wq", 0,
max_wq_cpus);
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