OSX drivers reading DisplayLink/.dl.xml many times a second?

xurizaemon · 04-28-2015, 06:09 PM

I discovered opensnoop tool today and was using it to debug another problem, but the first thing I saw when running it was that DisplayLink appears to be reading /Library/Application Support/DisplayLink/.dl.xml several times a second.

Here's what a few seconds of running

Code:

sudo opensnoop

looks like to me. I'm using the latest DisplayLink OSX 2.4.beta1 and OSX 10.10.3 on a MacBook Air (11-inch, Mid 2011). I do not have a DisplayLink device (or any external devices) connected at present.

Code:

~ $ sudo opensnoop
Password:
  UID    PID COMM          FD PATH
    0    103 DisplayLinkMana  59 /Library/Application Support/DisplayLink/.dl.xml
    0    103 DisplayLinkMana  59 /Library/Application Support/DisplayLink/.dl.xml
    0    103 DisplayLinkMana  59 /Library/Application Support/DisplayLink/.dl.xml
    0    103 DisplayLinkMana  59 /Library/Application Support/DisplayLink/.dl.xml
  501    428 SpotifyWebHelpe   8 /Users/chris/Library/LaunchAgents/com.spotify.webhelper.plist
    0    103 DisplayLinkMana  59 /Library/Application Support/DisplayLink/.dl.xml
    0    103 DisplayLinkMana  59 /Library/Application Support/DisplayLink/.dl.xml
    0    103 DisplayLinkMana  59 /Library/Application Support/DisplayLink/.dl.xml
    0    103 DisplayLinkMana  59 /Library/Application Support/DisplayLink/.dl.xml
  501   1004 iTerm         24 /Applications/iTerm.app/Contents/Resources/config.png
    0    268 WindowServer   4 /Applications/iTerm.app
    0    268 WindowServer   4 /Applications/iTerm.app/Contents
    0    268 WindowServer   4 /Applications/iTerm.app/Contents/Info.plist
    0    268 WindowServer   4 /Applications/iTerm.app/Contents/Resources
    0    268 WindowServer   4 /Applications/iTerm.app/Contents/Resources
    0    268 WindowServer   4 /Applications/iTerm.app/Contents/Resources/English.lproj
    0    268 WindowServer  -1 /Applications/iTerm.app/Contents/Resources/Base.lproj
    0    103 DisplayLinkMana  59 /Library/Application Support/DisplayLink/.dl.xml
    0    103 DisplayLinkMana  59 /Library/Application Support/DisplayLink/.dl.xml

Reporting because as a developer this "smells" like a place where code is not behaving as expected and might lead to bugs or suboptimal performance - would be interested if others can see the same behaviour on OSX?