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Differential D5745

rwlock(9): Add shared priority propagation mode
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Authored by cem on Mar 26 2016, 1:43 AM.
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imp
wblock

Details

Reviewers
kib
markj
jhb
Group Reviewers
manpages
Summary

Add shared priority propagation as an optional rwlock mode (default off).

All rwlocks are bloated by a pointer (32 -> 40 bytes on amd64).

Locks that opt in to shared priority propagation pass rw_priotracker structs
exactly like rmlocks.

Test Plan

The use case in mind is the PV global lock.

Diff Detail

Repository
rS FreeBSD src repository - subversion
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Lint Passed
Unit
No Test Coverage
Build Status
Buildable 3140
Build 3173: arc lint + arc unit

Event Timeline

cem updated this revision to Diff 14622.Mar 26 2016, 1:43 AM
cem retitled this revision from to rwlock(9): Add shared priority propagation mode.
cem updated this object.
cem edited the test plan for this revision. (Show Details)
cem added reviewers: jhb, markj, kib.
Herald added a reviewer: manpages. · View Herald TranscriptMar 26 2016, 1:43 AM
Herald added a subscriber: imp. · View Herald Transcript
wblock added a subscriber: wblock.Mar 26 2016, 2:11 AM

Man page changes look good!

cem updated this revision to Diff 14907.Apr 6 2016, 1:59 AM
cem edited edge metadata.

Pick the oldest reader thread as owner for consistency in turnstile.

Herald edited edge metadata. · View Herald TranscriptApr 6 2016, 1:59 AM
cem abandoned this revision.Dec 23 2016, 12:00 AM

Revision Contents
Changeset List

PathSize
share/
man/
man9/
52 lines
sys/
kern/
214 lines
1 line
sys/
11 lines
1 line
31 lines

Diff 14907

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share/man/man9/rwlock.9

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sys/kern/kern_rwlock.c

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sys/kern/subr_lock.c

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sys/sys/_rwlock.h

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sys/sys/lock.h

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sys/sys/rwlock.h

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