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Differential D12260

cpufreq(4) hwpstate: Yield CPU awaiting frequency change
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Authored by cem on Sep 6 2017, 8:01 PM.
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avg
jhb
mjoras
truckman
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rS323286: cpufreq(4) hwpstate: Yield CPU awaiting frequency change
Summary

It doesn't seem necessary to busy the CPU while waiting to transition
into a different p-state.

Test Plan

Transitions continue to work (well, P0 and P2), just like before.

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rS FreeBSD src repository - subversion
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Event Timeline

cem created this revision.Sep 6 2017, 8:01 PM
truckman accepted this revision.Sep 7 2017, 5:57 PM

Builds fine and doesn't appear to break anything on my Ryzen machine.

This revision is now accepted and ready to land.Sep 7 2017, 5:57 PM
Closed by commit rS323286: cpufreq(4) hwpstate: Yield CPU awaiting frequency change (authored by cem). · Explain WhySep 7 2017, 8:20 PM
This revision was automatically updated to reflect the committed changes.

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PathSize
head/
sys/
x86/
cpufreq/
14 lines

Diff 32786

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head/sys/x86/cpufreq/hwpstate.c

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