| created | 2019-03-16T15:58:37Z |
|---|---|
| begin | 2019-03-09T00:00:00Z |
| end | 2019-03-10T00:00:00Z |
| path | src/sys |
| commits | 3 |
| date | 2019-03-09T06:14:21Z | |||
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| author | visa | |||
| files | src/sys/sys/atomic.h | log | diff | annotate |
| message |
Add macros READ_ONCE() and WRITE_ONCE(). They constrain optimizations done by the compiler. OK guenther@ |
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| date | 2019-03-09T06:15:48Z | |||
|---|---|---|---|---|
| author | visa | |||
| files | src/sys/sys/smr.h | log | diff | annotate |
| message |
Use READ_ONCE() and WRITE_ONCE() in OK guenther@ |
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| date | 2019-03-09T23:04:56Z | |||
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| author | cheloha | |||
| files | src/sys/kern/kern_tc.c | log | diff | annotate |
| message |
tc_windup: read active timecounter once at function start. tc_windup() is not necessarily called with KERNEL_LOCK, so it is possible for the timecounter pointer to change in the midst of the call via the kern.timecounter.hardware sysctl(2). Reading it once and using that local copy ensures we're referring to the same timecounter consistently. Apparently the compiler can optimize this out... somehow... so there may be room for improvement. Idea from visa@. With input from visa@, mpi@, cjeker@, and guenther@. ok visa@ mpi@ |
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