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(parent: d425254) | patch
Simplify lazy advance with a 64bit atomic cmpset.
authorjeff <jeff@FreeBSD.org>
Thu, 27 Feb 2020 19:05:26 +0000 (19:05 +0000)
committerjeff <jeff@FreeBSD.org>
Thu, 27 Feb 2020 19:05:26 +0000 (19:05 +0000)
commitafe550b4a35870ef9043840255d53cbf45358699
treef6d0e7580d82ffc47929b37c07fcec12e3930f4ftree | snapshot
parentd425254c28d9b03950ee7cc34ebc2bcce7fbf72ccommit | diff
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
sys/kern/subr_smr.c diff | blob | history
sys/sys/smr.h diff | blob | history
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