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ztimer/periodic: reinit remove from right clock and handle aquired ztimer #19826

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merged 1 commit into from
Jul 24, 2023
Merged

ztimer/periodic: reinit remove from right clock and handle aquired ztimer #19826

merged 1 commit into from
Jul 24, 2023

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kfessel
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@kfessel kfessel commented Jul 13, 2023 •
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Contribution description

#19806 added some retinit handling for ztimer periodic removing the timer from the new clock

This tries to detect if this is a reinit and remove the timer from the old clock
this also removes the ztimer_acquire/_release handling by removing now calls in favour of set return value and now values that are allready in ztimer,
that also has the potential to reduce the jitter of the periodic calls and bus-usage (for cpus that take their time to get "now")

Testing procedure

read

run tests/sys/ztimer_periodic

Issues/PRs references

Fixes #19806

@kfessel kfessel requested review from benpicco and removed request for kaspar030 and bergzand July 13, 2023 14:19
@github-actions github-actions bot added Area: timers Area: timer subsystems Area: sys Area: System labels Jul 13, 2023
@kfessel kfessel added the CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR label Jul 13, 2023
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riot-ci commented Jul 13, 2023 •
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Murdock results

✔️ PASSED

4f2237d ztimer/periodic: stop timer before reinit, remove aquire/release

Success Failures Total Runtime
6936 0 6936 09m:21s

Artifacts

@kfessel kfessel force-pushed the p-ztimer_periodic_init branch 3 times, most recently from ba1d5f9 to c4c555f Compare July 14, 2023 10:22
@kfessel kfessel added the Type: bug The issue reports a bug / The PR fixes a bug (including spelling errors) label Jul 14, 2023
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kfessel commented Jul 14, 2023

upgraded this to bug, since restart is documented but leaves a wrong ztimer_aquire/release count without this PR (since it isn't tracking correctly unless the same number for starts and stops happen)

RIOT/sys/include/ztimer/periodic.h

Line 122 in b482a71

* When called on an already running timer, the current interval is reset to its

benpicco
benpicco reviewed Jul 14, 2023
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I think this makes sense, but uncrustify is not happy (and rightfully so)

benpicco
benpicco reviewed Jul 14, 2023
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sys/ztimer/periodic.c Outdated
Comment on lines 87 to 89
ztimer_remove(timer->clock, &timer->timer);
ztimer_release(timer->clock);
timer->timer.arg = NULL;
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@benpicco benpicco Jul 14, 2023 •
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Should we also do this (other than the ztimer_remove()) inside _ztimer_periodic_callback() for the !ZTIMER_PERIODIC_KEEP_GOING case?

Why is ztimer_acquire()/ztimer_release() needed here when we do a ztimer_set() anyway?

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Why is ztimer_acquire()/ztimer_release() needed here when we do a ztimer_set() anyway?

atm it needs the aquire (at least for start), but maybe we can rewrite it

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kfessel commented Jul 14, 2023 •
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How about this

but now it should be tested

did that -> failed added + timer->interval at the start

@kfessel kfessel added CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR Area: CI Area: Continuous Integration of RIOT components and removed CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR Area: CI Area: Continuous Integration of RIOT components labels Jul 14, 2023
@kfessel kfessel force-pushed the p-ztimer_periodic_init branch 2 times, most recently from b9ab8aa to 1cb9bcf Compare July 14, 2023 14:55
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ztimer/periodic: stop timer before reinit, remove aquire/release
4f2237d 
    - not ztimer_now calls outsid irq -> remove aquire
kaspar030
kaspar030 approved these changes Jul 17, 2023
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I'm fine here generally, didn't do any testing.

ACK

benpicco
benpicco reviewed Jul 24, 2023
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bors merge

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bors bot commented Jul 24, 2023

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@bors bors bot merged commit bff7452 into RIOT-OS:master Jul 24, 2023
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@kfessel kfessel mentioned this pull request Aug 1, 2023
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@MrKevinWeiss MrKevinWeiss added this to the Release 2023.10 milestone Nov 17, 2023
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@benpicco benpicco benpicco left review comments

@kaspar030 kaspar030 kaspar030 approved these changes

@bergzand bergzand Awaiting requested review from bergzand bergzand is a code owner

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@kfessel @riot-ci @benpicco @kaspar030 @MrKevinWeiss