Re: kern/54102: Multiple values from "vmstat -s" are broken

[mlelstv%serpens.de@localhost (Michael van Elst)]

The following reply was made to PR kern/54102; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/54102: Multiple values from "vmstat -s" are broken
Date: Sat, 6 Apr 2019 18:20:19 -0000 (UTC)

 n54%gmx.com@localhost writes:
 
 >Multiple values from "vmstat -s" are unreliable and appear to overflow.
 >E.g.
 >18446744073091529768 pagealloc desired color avail
 >18446744072282190447 pagealloc desired color not avail
 
 The kernel uses a signed 'int' to count such events, reports these
 as signed 'int64_t' and vmstat prints them as u64. That's true
 for a large number of values in uvmextern.
 
 Changing this to use unsigned would be the first thing to do.
 64bit values may not be atomic enough on some architectures.
 
 
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                                 Michael van Elst
 Internet: mlelstv%serpens.de@localhost
                                 "A potential Snark may lurk in every tree."