On Tue, 14 Oct 1997, Riccardo Facchetti wrote:
> I think having the Pentium Counters info handy may be interesting, but I
> think they may be "more handy" if you make it available trought the
> /proc/ filesystem. May be in the /proc/sys/ subdir (sysctl() interface)
> This way you could have something like:
>
> /proc/sys/pentium/data_read
> /proc/sys/pentium/data_write
> /proc/sys/pentium/data_tlb_miss
> ... etc ...
>
> An user can activate a counter writing something (I remember that
> something is needed to activate the counters) to the counter file, then he
> can see the counter value simply catting the file. Something like:
>
> echo "on" > data_read && cat data_read # init and read initial value
> sleep 10
> cat data_read # read the counter after 10 secs
> echo "off" > data_read # stop data_read counter
>
> Oh ... and check what can be done if you have an SMP machine.
The problem is that you might not want to have Joe user fiddle around with
MSR settings. With a device, the sysadmin can easily set the permissions
by hand. It is my understanding, that, with the proc device, you'd have to
patch the kernel.
What is the sysctl() interface?
> Riccardo.
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