[PATCHSET,v3,0/5] Add support for batched min timeout

Message

Jens Axboe Aug. 16, 2024, 8:38 p.m. UTC

Hi,

After somewhat of a lengthy delay from v2, here's v3 of this patchset.
We've now validated this actually makes sense and helps for production
workloads where there's a big gap between the peak and slow hours in
terms of load. Having a min time enables the same settings to be used
for peak hours (guaranteeing minimum response time), while avoiding
excessive context switches during lulls.

For a full description, see the v2 posting:

https://lore.kernel.org/io-uring/[e-mail]/

As before, there's a liburing branch with added test cases, it can be
found here:

https://git.kernel.dk/cgit/liburing/log/?h=min-wait

The patches are on top of for-6.12/io_uring, and with David Wei's
new iowait feat and enter flag added to avoid conflicts with that.

Changes since v2:
- Rebase on current 6.12 tree, which was mostly centered around Pavel's
  rework of the timeout handling and ABS_TIME additions
- Since there's now one more argument for io_cqring_wait(), wrap those
  output arguments in a struct ext_arg.

 include/uapi/linux/io_uring.h |   3 +-
 io_uring/io_uring.c           | 187 +++++++++++++++++++++++++---------
 io_uring/io_uring.h           |   4 +
 3 files changed, 147 insertions(+), 47 deletions(-)