Differential D17849

Add a KPI for the delay while spinning on a spin lock.
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Authored by jhb on Nov 5 2018, 6:11 PM.

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Details

Reviewers

kib
manu

Commits

rS340164: Add a KPI for the delay while spinning on a spin lock.

Summary

Replace a call to DELAY(1) with a new cpu_lock_delay() KPI. Currently
cpu_lock_delay() is defined to DELAY(1) on all platforms. However,
platforms with a DELAY() implementation that uses spin locks should
implement a custom cpu_lock_delay() doesn't use locks.

Test Plan

passed make tinderbox (aside from unrelated breakage in arm.GENERIC-NODEBUG)
booted in i386 and amd64 VMs
original PR reporter booted combined patch on amd64 machine

Diff Detail

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Unit

Tests Skipped

Build Status

Buildable 20640
Build 20056: arc lint + arc unit

Event Timeline

jhb created this revision.Nov 5 2018, 6:11 PM

Herald added a reviewer: manu. · View Herald TranscriptNov 5 2018, 6:11 PM

Herald added subscribers: jhibbits, emaste, andrew. · View Herald Transcript

Harbormaster completed remote builds in B20640: Diff 50032.Nov 5 2018, 6:11 PM

jhb added a child revision: D17850: Add a delay_tsc() static function for when DELAY() uses the TSC..Nov 5 2018, 6:14 PM

kib accepted this revision.Nov 5 2018, 9:22 PM

This revision is now accepted and ready to land.Nov 5 2018, 9:22 PM

jhb closed this revision.Nov 5 2018, 10:47 PM

jhb added a commit: rS340164: Add a KPI for the delay while spinning on a spin lock..

Revision Contents
Changeset List

Path

Size

sys/

amd64/

include/

1 line

arm/

include/

1 line

arm64/

include/

1 line

i386/

include/

1 line

kern/

2 lines

mips/

include/

1 line

powerpc/

include/

1 line

riscv/

include/

1 line

sparc64/

include/

1 line

Diff 50032

sys/amd64/include/cpu.h

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sys/arm/include/cpu.h

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sys/arm64/include/cpu.h

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sys/i386/include/cpu.h

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sys/kern/kern_mutex.c

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sys/mips/include/cpu.h

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sys/powerpc/include/cpu.h

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sys/riscv/include/cpu.h

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sys/sparc64/include/cpu.h

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