On Fri, Jul 06, 2007 at 07:43:15PM -0400, Mathieu Desnoyers wrote:
> * Adrian Bunk ([email protected]) wrote:
> > On Fri, Jul 06, 2007 at 06:14:10PM -0400, Chuck Ebbert wrote:
> > > On 07/06/2007 07:44 AM, Andi Kleen wrote:
> > > > I think the optimization is a good idea, although i dislike it
> > > > that it is complicated for the dynamic markers. If it was just
> > > > static it would be much simpler.
> > >
> > > Another thing to consider is that there might be hundreds of these
> > > probes/tracepoints active in an instrumented kernel. The overhead
> > > adds up fast, so the gain may be worth all the pain.
> >
> > Only if you want to squeeze the last bit of performance out of
> > _debugging_ functionality.
> >
> > You avoid all the pain if you simply don't use debugging functionality
> > on production systems.
> >
>
> Adrian,
>
> Please have a look at my markers posts, especially:
>
> http://www.ussg.iu.edu/hypermail/linux/kernel/0707.0/0669.html
>
> And also look into OLS 2007 proceedings for Martin Bligh's paper on
> Debugging Google sized clusters. It basically makes the case for adding
> functionnality to debug _user space_ problems on production systems that
> can be turned on dynamically.
Using a different kernel for tracing still fulfills all the requirements
listed in section 5 of your paper...
> Mathieu
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
