6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Felix Moessbauer <felix.moessbauer@xxxxxxxxxxx>
[ Upstream commit 84eacf177faa605853c58e5b1c0d9544b88c16fd ]
The io worker threads are userland threads that just never exit to the
userland. By that, they are also assigned to a cgroup (the group of the
creating task).
When creating a new io worker, this worker should inherit the cpuset
of the cgroup.
Fixes: da64d6db3bd3 ("io_uring: One wqe per wq")
Signed-off-by: Felix Moessbauer <felix.moessbauer@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240910171157.166423-3-felix.moessbauer@xxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
io_uring/io-wq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/io_uring/io-wq.c b/io_uring/io-wq.c
index 2df8d98738498..a1e31723c9ed6 100644
--- a/io_uring/io-wq.c
+++ b/io_uring/io-wq.c
@@ -1170,7 +1170,7 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
if (!alloc_cpumask_var(&wq->cpu_mask, GFP_KERNEL))
goto err;
- cpumask_copy(wq->cpu_mask, cpu_possible_mask);
+ cpuset_cpus_allowed(data->task, wq->cpu_mask);
wq->acct[IO_WQ_ACCT_BOUND].max_workers = bounded;
wq->acct[IO_WQ_ACCT_UNBOUND].max_workers =
task_rlimit(current, RLIMIT_NPROC);
--
2.43.0
