Diffusion FreeBSD src repository - subversion rS358400

Simplify lazy advance with a 64bit atomic cmpset.
rS358400
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Description

Simplify lazy advance with a 64bit atomic cmpset.

This provides the potential to force a lazy (tick based) SMR to advance
when there are blocking waiters by decoupling the wr_seq value from the
ticks value.

Add some missing compiler barriers.

Reviewed by: rlibby
Differential Revision: https://reviews.freebsd.org/D23825

Details

Provenance

jeff	Authored on

Reviewer

rlibby

Differential Revision

D23825: Simplify lazy advance and decouple it somewhat from ticks so that it canbe forwarded after other broadcast interrupts.

Parents

rS358399: Merge ^/vendor/llvm-project/release-10.x up to its last change (upstream

Branches

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Tags

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Event Timeline

jeff committed rS358400: Simplify lazy advance with a 64bit atomic cmpset..Feb 27 2020, 7:05 PM

jeff added an edge: D23825: Simplify lazy advance and decouple it somewhat from ticks so that it canbe forwarded after other broadcast interrupts..

Changes (2)

Path

Size

head/

sys/

kern/

subr_smr.c

sys/

smr.h

rS358400

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head/sys/kern/subr_smr.c