From: Marco Crivellari <marco.crivell...@suse.com>
Currently if a user enqueue a work item using schedule_delayed_work() the
used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use
WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to
schedule_work() that is using system_wq and queue_work(), that makes use
again of WORK_CPU_UNBOUND.
This lack of consistentcy cannot be addressed without refactoring the API.
system_wq is a per-CPU worqueue, yet nothing in its name tells about that
CPU affinity constraint, which is very often not required by users. Make
it clear by adding a system_percpu_wq.
queue_work() / queue_delayed_work() mod_delayed_work() will now use the
new per-cpu wq: whether the user still stick on the old name a warn will
be printed along a wq redirect to the new one.
This patch add the new system_percpu_wq except for mm, fs and net
subsystem, whom are handled in separated patches.
The old wq will be kept for a few release cylces.
Suggested-by: Tejun Heo <t...@kernel.org>
Signed-off-by: Marco Crivellari <marco.crivell...@suse.com>
Signed-off-by: Paul E. McKenney <paul...@kernel.org>
---
kernel/rcu/tasks.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index f92443561d365a..2dc044fd126eb0 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -553,13 +553,13 @@ static void rcu_tasks_invoke_cbs(struct rcu_tasks *rtp,
struct rcu_tasks_percpu
rtpcp_next = rtp->rtpcp_array[index];
if (rtpcp_next->cpu <
smp_load_acquire(&rtp->percpu_dequeue_lim)) {
cpuwq = rcu_cpu_beenfullyonline(rtpcp_next->cpu) ?
rtpcp_next->cpu : WORK_CPU_UNBOUND;
- queue_work_on(cpuwq, system_wq, &rtpcp_next->rtp_work);
+ queue_work_on(cpuwq, system_percpu_wq,
&rtpcp_next->rtp_work);
index++;
if (index < num_possible_cpus()) {
rtpcp_next = rtp->rtpcp_array[index];
if (rtpcp_next->cpu <
smp_load_acquire(&rtp->percpu_dequeue_lim)) {
cpuwq =
rcu_cpu_beenfullyonline(rtpcp_next->cpu) ? rtpcp_next->cpu : WORK_CPU_UNBOUND;
- queue_work_on(cpuwq, system_wq,
&rtpcp_next->rtp_work);
+ queue_work_on(cpuwq, system_percpu_wq,
&rtpcp_next->rtp_work);
}
}
}
--
2.40.1
