Jens Axboe c7920f9928 io_uring: gate iowait schedule on having pending requests ... Commit 7b72d661f1 upstream. A previous commit made all cqring waits marked as iowait, as a way to improve performance for short schedules with pending IO. However, for use cases that have a special reaper thread that does nothing but wait on events on the ring, this causes a cosmetic issue where we know have one core marked as being "busy" with 100% iowait. While this isn't a grave issue, it is confusing to users. Rather than always mark us as being in iowait, gate setting of current->in_iowait to 1 by whether or not the waiting task has pending requests. Cc: stable@vger.kernel.org Link: https://lore.kernel.org/io-uring/CAMEGJJ2RxopfNQ7GNLhr7X9=bHXKo+G5OOe0LUq=+UgLXsv1Xg@mail.gmail.com/ Link: https://bugzilla.kernel.org/show_bug.cgi?id=217699 Link: https://bugzilla.kernel.org/show_bug.cgi?id=217700 Reported-by: Oleksandr Natalenko <oleksandr@natalenko.name> Reported-by: Phil Elwell <phil@raspberrypi.com> Tested-by: Andres Freund <andres@anarazel.de> Fixes: 8a796565ce ("io_uring: Use io_schedule* in cqring wait") Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-08-11 12:08:08 +02:00
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Makefile	…
advise.c	…
advise.h	…
alloc_cache.h	io_uring: fix poll/netmsg alloc caches	2023-04-06 12:10:52 +02:00
cancel.c	…
cancel.h	…
epoll.c	io_uring: undeprecate epoll_ctl support	2023-06-09 10:34:23 +02:00
epoll.h	…
fdinfo.c	…
fdinfo.h	…
filetable.c	io_uring/rsrc: fix null-ptr-deref in io_file_bitmap_get()	2023-03-30 12:49:25 +02:00
filetable.h	…
fs.c	…
fs.h	…
io-wq.c	…
io-wq.h	…
io_uring.c	io_uring: gate iowait schedule on having pending requests	2023-08-11 12:08:08 +02:00
io_uring.h	…
kbuf.c	io_uring: fix memory leak when removing provided buffers	2023-04-13 16:55:31 +02:00
kbuf.h	…
msg_ring.c	…
msg_ring.h	…
net.c	io_uring/net: use the correct msghdr union member in io_sendmsg_copy_hdr	2023-06-28 11:12:33 +02:00
net.h	…
nop.c	…
nop.h	…
notif.c	…
notif.h	…
opdef.c	…
opdef.h	…
openclose.c	…
openclose.h	…
poll.c	io_uring/poll: serialize poll linked timer start with poll removal	2023-06-28 11:12:27 +02:00
poll.h	…
refs.h	…
rsrc.c	io_uring/rsrc: use nospec'ed indexes	2023-05-11 23:03:24 +09:00
rsrc.h	io_uring/rsrc: fix rogue rsrc node grabbing	2023-04-06 12:10:51 +02:00
rw.c	…
rw.h	…
slist.h	…
splice.c	…
splice.h	…
sqpoll.c	io_uring: unlock sqd->lock before sq thread release CPU	2023-06-21 16:00:53 +02:00
sqpoll.h	…
statx.c	…
statx.h	…
sync.c	…
sync.h	…
tctx.c	…
tctx.h	…
timeout.c	…
timeout.h	…
uring_cmd.c	block/io_uring: pass in issue_flags for uring_cmd task_work handling	2023-04-06 12:10:51 +02:00
uring_cmd.h	…
xattr.c	…
xattr.h	…