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Differential D24621

Avoid switching CPUs in epoch_drain_callbacks().
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Authored by markj on Apr 29 2020, 5:21 PM.
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erj
freebsd_igalic.co

Details

Reviewers
jeff
• hselasky
glebius
Summary

This avoids problems caused by binding to a CPU monopolized by a
high-priority thread.

Instead, implement a simple state machine that allows callback threads
to signal when they're done executing deferred callbacks for a given
epoch domain.

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Build Status
Buildable 30796
Build 28519: arc lint + arc unit

Event Timeline

markj requested review of this revision.Apr 29 2020, 5:21 PM
markj created this revision.
Harbormaster completed remote builds in B30796: Diff 71158.Apr 29 2020, 5:21 PM
markj added reviewers: jeff, • hselasky, glebius.Apr 29 2020, 5:22 PM
markj added a subscriber: erj.

I understand that there is a plan to remove this interface entirely, but this provides a workaround in the meantime and could be merged to 12.

• hselasky added a comment.May 19 2020, 11:33 AM

I need some more time to review this. Any updates?

markj added a comment.May 19 2020, 1:56 PM
In D24621#548401, @hselasky wrote:

I need some more time to review this. Any updates?

I have no updates. I'll spend some more time on testing shortly.

freebsd_igalic.co added a subscriber: freebsd_igalic.co.Mar 24 2021, 4:13 PM
markj abandoned this revision.Sep 20 2024, 8:40 AM

Revision Contents
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sys/
kern/
98 lines

Diff 71158

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sys/kern/subr_epoch.c

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