Re: readprofile ; Meaning of "Length of procedure"

[Andy Pfiffer]

On Mon, 2003-04-14 at 16:23, [e-mail] wrote:
> Thanks a lot Andy, one this that is bothering me is,
> Say if the load of procedures by executing the command mentioned by you is as
> follows in descending order....
> 
> 2604	__geneic_copy_to_user 		40.6875
> 1705	csum_patrial_copy_generic	6.8750
> 370	__generic_copy_from_user	3.75
> 764	do_annonymous_page		3.1754
> 176	handle_IRQ_event		1.5714
> 31	remove_wait_queue		0.96
> 
> the list goes on
> 
> are these procedures condidered as load on the CPU? how much of a load ?
> very high, high, moderate .....

Based only on the data from the fragment above, your relative percentage
of time spent breaks down like this (I'm using the 1st column):

	46%	__generic_copy_to_user (2604 / 5650)
	30%	csum_partial_copy_generic (1705 / 5650)
	13%	do_anonymous_page (764 / 5650)
	 6%	__generic_copy_from_user (370 / 5650)

Whatever you were doing when you collected this profile, your system was
spending roughly 76% of the time copying data from kernel space to user
space.

I can't tell you why it was doing that; for some applications this may
be expected and normal.  I don't find the "load" column all that useful
myself -- others will certainly differ.

Regards,
Andy