CVS commit: src/usr.bin/systat

["Simon Burge" <simonb%netbsd.org@localhost>]

Module Name:    src
Committed By:   simonb
Date:           Sat Jul 24 13:42:05 UTC 2021

Modified Files:
        src/usr.bin/systat: vmstat.c

Log Message:
Instead of getting an estimate of the number of kernel buffers,
allocating memory for them, requesting all the metadata contents of
these buffers (and repeating in the unlikely case of the number of
buffers increasing too much since the estimate) and then straight away
throwing all the contents out just to count how many buffers there were,
just get the initial estimate from the kernel and subtract the slop.

Reduces system CPU usage of "systat vm" by approx 80% for any system
with a reasonable number of buffers.


To generate a diff of this commit:
cvs rdiff -u -r1.88 -r1.89 src/usr.bin/systat/vmstat.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.