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Evenly distribute the taskq threads across available CPUs

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The problem is described in commit aeeb4e0c0a.
However, instead of disabling the binding to CPU altogether we just keep the
last CPU index across calls to taskq_create() and thus achieve even
distribution of the taskq threads across all available CPUs.

The implementation based on assumption that task queues initialization
performed in serial manner.

Signed-off-by: Andrey Vesnovaty <andrey.vesnovaty@gmail.com>
Signed-off-by: Andrey Vesnovaty <andreyv@infinidat.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #336
This commit is contained in:
Andrey Vesnovaty 2013-08-28 05:09:25 +03:00 committed by Brian Behlendorf
parent ae16ed992b
commit 703371d8c7
2 changed files with 21 additions and 0 deletions
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12
man/man5/spl-module-parameters.5
View File

@ -124,3 +124,15 @@ Spin a maximum of N times to acquire lock
.sp
.ne -4
Default value: \fB0\fR.
.RE
.sp
.ne 2
.na
\fBspl_taskq_thread_bind\fR (int)
.ad
.RS 12n
Bind taskq thread to CPU
.sp
Default value: \fB0\fR.
.RE

9
module/spl/spl-taskq.c
View File

@ -34,6 +34,10 @@
#define SS_DEBUG_SUBSYS SS_TASKQ
int spl_taskq_thread_bind = 0;
module_param(spl_taskq_thread_bind, int, 0644);
MODULE_PARM_DESC(spl_taskq_thread_bind, "Bind taskq thread to CPU by default");
/* Global system-wide dynamic task queue available for all consumers */
taskq_t *system_taskq;
EXPORT_SYMBOL(system_taskq);
@ -781,6 +785,7 @@ taskq_t *
taskq_create(const char *name, int nthreads, pri_t pri,
int minalloc, int maxalloc, uint_t flags)
{
static int last_used_cpu = 0;
taskq_t *tq;
taskq_thread_t *tqt;
int rc = 0, i, j = 0;
@ -843,6 +848,10 @@ taskq_create(const char *name, int nthreads, pri_t pri,
"%s/%d", name, i);
if (tqt->tqt_thread) {
list_add(&tqt->tqt_thread_list, &tq->tq_thread_list);
if (spl_taskq_thread_bind) {
last_used_cpu = (last_used_cpu + 1) % num_online_cpus();
kthread_bind(tqt->tqt_thread, last_used_cpu);
}
set_user_nice(tqt->tqt_thread, PRIO_TO_NICE(pri));
wake_up_process(tqt->tqt_thread);
j++;