I can confirm that upstream commit 0b8eb2ee9da1 "s390/cio: add cond_resched()
in the slow_eval_known_fn() loop" is already integrated in:
- focal / 20.04 - as 713670caca61 since Ubuntu-5.4.0-49.53 (current:
5.4.0.52.55)
- groovy / 20.10 - as f34ff724675f since Ubuntu-5.8.0-19.20 (current:
5.8.0.26.31)
(and since the hirsute kernel was just copied over from groovy, it's also in
hirsute).
Hence I'm closing this ticket as Fix Released.
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Changed in: linux (Ubuntu)
Assignee: Skipper Bug Screeners (skipper-screen-team) => Frank Heimes
(fheimes)
** Changed in: linux (Ubuntu)
Status: New => Fix Released
** Changed in: ubuntu-z-systems
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1902489
Title:
[UBUNTU 20.10] s390-cio: Add cond_resched() in the
slow_eval_known_fn() loop
Status in Ubuntu on IBM z Systems:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Bug description:
Description: s390-cio: Add cond_resched() in the slow_eval_known_fn() loop
Symptom: Slow performance during the subchannel scanning
Problem: Higher scheduling latencies for tasks during the subchannel
scanning event on devices with lots of known-subchannels. The
subchannel scanning of known-devices doesnt allow scheduling
of other tasks especially on systems with a single CPU.
Solution: Add cond_resched() call to allow explicit scheduling in the
scanning loop
Reproduction: -
Upstream-ID: 0b8eb2ee9da1e8c9b8082f404f3948aa82a057b2
kernel 5.9
It's also tagged as stable with 5.4.
Please check if this will be picked up by Canonical by default..
THX
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