George Anzinger writes:
> I am more interested in making kernel symbols and their values available
> to programs. For example I currently need the value of
> "delay_at_last_interrupt" a wonderful value that the time.c keeps.
>
> I assume that I can clip code from ksymoops to fetch the symbol address
> and hopefully its value. Since this thing changes each 10ms I need to
> get it in a hurry.
Presumably you'd parse the System.map file once, and then reference internal
data structures in your program to obtain the address? The kernel does not
change that often on a machine while your program is running (hopefully it
never does ;)), so you're looking at a one-time parse. Once that is done,
you can then happily read any value from any address in kernel space that
you desire, as rapidly as lseek() and read() allows you to.
If you're talking about a program that the user invokes, then you don't
have 10ms accuracy on the user pressing the return key, so what does an
initial 50ms of parse time matter?
I hope I haven't missed any of you previous points - I've not been following
the thread closely.
_____
|_____| ------------------------------------------------- ---+---+-
| | Russell King rmk@arm.linux.org.uk --- ---
| | | | http://www.arm.linux.org.uk/~rmk/aboutme.html / / |
| +-+-+ --- -+-
/ | THE developer of ARM Linux |+| /|\
/ | | | --- |
+-+-+ ------------------------------------------------- /\\\ |
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