rctl logs swapuse even if swap is empty

[Miroslav Lachman]

I tried RCTL for the first time, so maybe it is error on my side.

I have system with 2 jail with the following rctl.conf

jail:fox:swapuse:log=32M
jail:fox:swapuse:deny=512M
jail:fox:memoryuse:log=3G
jail:fox:memoryuse:deny=4096M

jail:olymp:swapuse:log=32M
jail:olymp:swapuse:deny=512M
jail:olymp:memoryuse:log=2G
jail:olymp:memoryuse:deny=3072M

Both jails are small webservers with PHP + Apache. They do not use much 
memory and they really do not user any swap space. (according to top and 
swapinfo)


# swapinfo -h
Device          1K-blocks     Used    Avail Capacity
/dev/mirror/gm0s1b  16777216       0B      16G     0%


# rctl -hu jail:fox | grep swap
swapuse=0


Processes in both jails are logged as using more than 32MB of swap:

Mar 21 01:18:55 neon kernel: rctl: rule "jail:fox:swapuse:log=33554432" 
matched by pid 20783 (httpd), uid 80, jail fox
Mar 21 01:18:55 neon kernel: rctl: rule "jail:fox:swapuse:log=33554432" 
matched by pid 20787 (httpd), uid 80, jail fox
Mar 21 01:18:58 neon kernel: rctl: rule "jail:fox:swapuse:log=33554432" 
matched by pid 19207 (httpd), uid 80, jail fox
Mar 21 01:18:58 neon kernel: rctl: rule "jail:fox:swapuse:log=33554432" 
matched by pid 20790 (sh), uid 0, jail fox
Mar 21 01:18:58 neon kernel: rctl: rule "jail:fox:swapuse:log=33554432" 
matched by pid 20792 (sh), uid 0, jail fox
Mar 21 01:18:58 neon kernel: rctl: rule 
"jail:olymp:swapuse:log=33554432" matched by pid 20793 (sh), uid 0, jail 
olymp
Mar 21 01:18:58 neon kernel: rctl: rule 
"jail:olymp:swapuse:log=33554432" matched by pid 20795 (sh), uid 0, jail 
olymp

Is it expected? I do not think so.
Or am I doing something wrong with rctl?


# uname -srmi
FreeBSD 10.1-RELEASE-p8 amd64 GEN_RCTL

Kernel is GENERIC + RCTL options

Miroslav Lachman