Revision b22fa62a35d7f2029d757a518d78041822b7c7c1 authored by Pavel Begunkov on 21 October 2021, 12:20:29 UTC, committed by Jens Axboe on 21 October 2021, 17:19:38 UTC
Another change to the API io-wq worker limitation API added in 5.15,
apply the limit to all prior users that already registered a tctx. It
may be confusing as it's now, in particular the change covers the
following 2 cases:
TASK1 | TASK2
_________________________________________________
ring = create() |
| limit_iowq_workers()
*not limited* |
TASK1 | TASK2
_________________________________________________
ring = create() |
| issue_requests()
limit_iowq_workers() |
| *not limited*
A note on locking, it's safe to traverse ->tctx_list as we hold
->uring_lock, but do that after dropping sqd->lock to avoid possible
problems. It's also safe to access tctx->io_wq there because tasks
kill it only after removing themselves from tctx_list, see
io_uring_cancel_generic() -> io_uring_clean_tctx()
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d6e09ecc3545e4dc56e43c906ee3d71b7ae21bed.1634818641.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <haoxu@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 parent 4ea672a
| File | Mode | Size |
|---|---|---|
| unittest-data | ||
| Kconfig | -rw-r--r-- | 2.3 KB |
| Makefile | -rw-r--r-- | 703 bytes |
| address.c | -rw-r--r-- | 27.1 KB |
| base.c | -rw-r--r-- | 59.6 KB |
| device.c | -rw-r--r-- | 9.8 KB |
| dynamic.c | -rw-r--r-- | 22.8 KB |
| fdt.c | -rw-r--r-- | 33.9 KB |
| fdt_address.c | -rw-r--r-- | 6.2 KB |
| irq.c | -rw-r--r-- | 18.6 KB |
| kexec.c | -rw-r--r-- | 10.6 KB |
| kobj.c | -rw-r--r-- | 3.9 KB |
| of_net.c | -rw-r--r-- | 3.8 KB |
| of_numa.c | -rw-r--r-- | 3.9 KB |
| of_private.h | -rw-r--r-- | 5.9 KB |
| of_reserved_mem.c | -rw-r--r-- | 11.3 KB |
| overlay.c | -rw-r--r-- | 34.3 KB |
| pdt.c | -rw-r--r-- | 4.8 KB |
| platform.c | -rw-r--r-- | 20.0 KB |
| property.c | -rw-r--r-- | 42.2 KB |
| resolver.c | -rw-r--r-- | 8.7 KB |
| unittest.c | -rw-r--r-- | 92.5 KB |
Computing file changes ...
