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Current tag: OPENBSD_7_5
Revision 1.77 / (download) - annotate - [select for diffs], Sun Dec 4 18:01:57 2022 UTC (18 months ago) by cheloha
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE,
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Changes since 1.76: +2 -3 lines
Diff to previous 1.76 (colored)
systat(1): vmstat: measure elapsed time with clock_gettime(2) instead of ticks The vmstat view in systat(1) should not use statclock() ticks to count elapsed time. First, ticks are low resolution. Second, the statclock is sometimes randomized, so each tick is not necessarily of equal length. Third, we're counting ticks from every CPU on the system, so every rate in the view is divided by the number of CPUs. For example, on an amd64 system with 8 CPUs you currently see: 200 clock ... when the true clock interrupt rate on that system is 1600. Instead, measure elapsed time with clock_gettime(2). Use CLOCK_UPTIME here so we exclude time when the system is suspended. With this change we no longer need "stathz" or "hertz". We can also get rid of the anachronistic secondary clock failure test. Prompted by dlg@ and jmatthew@. deraadt@ says this has been in snaps since 2022-11-21; no complaints. Link: https://marc.info/?l=openbsd-tech&m=166898960831136&w=2 ok dlg@ deraadt@