Determining disk activity per volume
Determining disk activity per volume
- Subject: Determining disk activity per volume
- From: Rick Mann <email@hidden>
- Date: Thu, 5 Oct 2006 19:02:15 -0700
Hi. I'd like to implement a disk activity indicator that lives in the
menu bar. I'm looking for suggestions on how to determine when a
particular a volume, device, or the filesystem (in decreasing order
of desirability) is reading from or writing to a device.
I have these requirements:
a) Do not destabilize the OS
b) Low system overhead
c) Reasonably rapid update (> 10 fps)
I've been looking at the fs_usage sources and sysctl() using
KERN_KDREADTR, and determining when read or write functions are
called. However, this polling approach doesn't strike me as very
elegant. I suppose I could make the call 10 times each second, and
then process the results, but it seems very unwieldy to do this. I
also don't know much about KERN_KDREADTR, because I can't seem to
find any documentation about it.
I'm trying to find the sources for sysctl(), but I don't know where
to look (is there a way to look up the location of commands and
functions?).
I'd appreciate any suggestions. Thanks!
--
Rick
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