---1463810047-92358563-945902960=:2694
Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
Content-ID: <Pine.LNX.4.10.9912221806421.2694@lap.valinuxny.net>
I was looking around for a utility to give me some
stats on my disk io. Something like iostat in Solaris.
Well, I found that /proc/stat only reports stats
for 4 disks. I'm not sure why that limitation exists,
but then I learned from Ted T'so that /proc/stat
is problematic in other ways.
A kernel instance only maintains a single
struct kernel_stat and thus io's into the indexed
dk_drive_rio, for instance are differentiated by
device. Io's to /dev/hda1 and /dev/sda1 are
comingled, and thus corrupted. At least that's
how I'm reading this code.
I made up this one patch which I believe ups the
number of devices reported in /proc/stat to 16.
But the problem of the undifferentiated devices
is a larger fish. Could we break up the indices
for io stats in kernel_stat into categories pertaining
to device types?
Any thoughts?
Thanks
ari
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