Differential D31778

callout(9): Allow spin locks use with callout_init_mtx()
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Authored by mav on Sep 2 2021, 12:02 AM.

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Details

Reviewers

• hselasky
jhb

Commits

rGb4194a432b59: callout(9): Allow spin locks use with callout_init_mtx().
rG4730a8972b1f: callout(9): Allow spin locks use with callout_init_mtx().

Summary

Implement lock_spin()/unlock_spin() lock class methods, moving the assertion to _sleep() instead. Change assertions in callout(9) to allow spin locks for both regular and C_DIRECT_EXEC cases. In case of C_DIRECT_EXEC spin locks are the only locks allowed.

As the first use case allow taskqueue_enqueue_timeout() use on fast task queues. It actually becomes more efficient due to avoided extra context switches in callout(9) thanks to C_DIRECT_EXEC.

Test Plan

Simple test using taskqueue_enqueue_timeout() on fast task queue, including recursively, successfully passes on debug kernel.

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Event Timeline

mav requested review of this revision.Sep 2 2021, 12:02 AM

mav created this revision.

I like this idea and wouldn't object to it.

This revision is now accepted and ready to land.Sep 2 2021, 7:51 AM

Minor tuning to unlock_spin().

This revision now requires review to proceed.Sep 2 2021, 2:01 PM

• hselasky accepted this revision.Sep 2 2021, 3:06 PM

This revision is now accepted and ready to land.Sep 2 2021, 3:06 PM

Closed by commit rG4730a8972b1f: callout(9): Allow spin locks use with callout_init_mtx(). (authored by mav). · Explain WhySep 3 2021, 1:27 AM

This revision was automatically updated to reflect the committed changes.

mav added a commit: rG4730a8972b1f: callout(9): Allow spin locks use with callout_init_mtx()..

mav added a commit: rGb4194a432b59: callout(9): Allow spin locks use with callout_init_mtx()..Sep 17 2021, 1:40 AM

Revision Contents
Changeset List

Path

Size

share/

man/

man9/

5 lines

5 lines

sys/

kern/

8 lines

2 lines

10 lines

subr_taskqueue.c

3 lines

Diff 94536

share/man/man9/callout.9

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share/man/man9/taskqueue.9

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sys/kern/kern_mutex.c

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sys/kern/kern_synch.c

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sys/kern/kern_timeout.c

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sys/kern/subr_taskqueue.c

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