6.10-stable review patch. If anyone has any objections, please let me know.
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From: Felix Moessbauer felix.moessbauer@siemens.com
[ 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@siemens.com Link: https://lore.kernel.org/r/20240910171157.166423-3-felix.moessbauer@siemens.c... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- 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 e38bbd07563ee..b59a1bf844cf9 100644 --- a/io_uring/io-wq.c +++ b/io_uring/io-wq.c @@ -1167,7 +1167,7 @@ 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);