cvs commit: src/sys/kern kern_timeout.c
jeff at FreeBSD.org
Sat Jul 19 05:18:43 UTC 2008
jeff 2008-07-19 05:18:29 UTC
FreeBSD src repository
SVN rev 180608 on 2008-07-19 05:18:29Z by jeff
Fix a race which could result in some timeout buckets being skipped.
- When a tick occurs on a cpu, iterate from cs_softticks until ticks.
The per-cpu tick processing happens asynchronously with the actual
adjustment of the 'ticks' variable. Sometimes the results may
be visible before the local call and sometimes after. Previously this
could cause a one tick window where we didn't evaluate the bucket.
- In softclock fetch curticks before incrementing cc_softticks so we
don't skip insertions which were made for the current time.
Sponsored by: Nokia
Revision Changes Path
1.114 +11 -6 src/sys/kern/kern_timeout.c
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