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| author | Jens Axboe <[email protected]> | 2023-07-24 17:28:17 +0000 |
|---|---|---|
| committer | Jens Axboe <[email protected]> | 2023-07-24 17:44:35 +0000 |
| commit | 7b72d661f1f2f950ab8c12de7e2bc48bdac8ed69 (patch) | |
| tree | 7e1831c46bf4f4065dba29f192440b2a89586c11 /lib/xarray.c | |
| parent | ia64: mmap: Consider pgoff when searching for free mapping (diff) | |
| download | kernel-7b72d661f1f2f950ab8c12de7e2bc48bdac8ed69.tar.gz kernel-7b72d661f1f2f950ab8c12de7e2bc48bdac8ed69.zip | |
io_uring: gate iowait schedule on having pending requests
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: [email protected]
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 <[email protected]>
Reported-by: Phil Elwell <[email protected]>
Tested-by: Andres Freund <[email protected]>
Fixes: 8a796565cec3 ("io_uring: Use io_schedule* in cqring wait")
Signed-off-by: Jens Axboe <[email protected]>
Diffstat (limited to 'lib/xarray.c')
0 files changed, 0 insertions, 0 deletions