[Lustre-discuss] copy_user_generic_c ?

[Roger Spellman]

It turns out that there was a problem in how I was using oprofile.  I
was doing opcontrol --start and opcontrol --stop.  But, I forgot to do
an opcontrol --reset in between.  So, in addition to recording my OST
results, oprofile was picking up some old data, which is probably where
the copy_(to,from)_user() came from.

Lesson learned:  Always do opcontrol --reset before opcontrol --start.

Thanks to everyone who helped me out.

Roger Spellman
Staff Engineer
Terascala, Inc.
508-588-1501
www.terascala.com


> I don't think copy_{to,from}_user() is expected to be called on the
OST
> with that frequency(if any) so having the stack trace will help us
> determine from where it is being called.
> 
> Thanks,
> Kalpak