[ltt-dev] General Questions

[Mathieu Desnoyers]

Hi Kevin,

See General setup,

enable : tracepoints, markers, LTT*... it should work.

Mathieu

* Kevin Harms (harms at mcs.anl.gov) wrote:
> Mathieu,
> 
>   applying the 0.12 patch to 2.6.26 worked cleanly. I built the kernel but it seems like it didn't enable the correct options.
> 
> ts14:~ # ltt-armall
> Connecting all markers
> cat: /proc/ltt: No such file or directory
> 
>   Under Kernel Hacking, I think i found a LTT option that was checked when i did a make menuconfig. But i didn't see the extensive list of options detailed on the web. For the 2.6.26, what do i need to enable in the make menuconfig?
> 
> thanks,
> kevin
>   
> ----- Original Message -----
> From: "Mathieu Desnoyers" <compudj at krystal.dyndns.org>
> To: "Kevin Harms" <harms at alcf.anl.gov>
> Cc: "Michel Dagenais" <michel.dagenais at polymtl.ca>, ltt-dev at lists.casi.polymtl.ca
> Sent: Saturday, July 26, 2008 12:19:40 AM GMT -06:00 US/Canada Central
> Subject: Re: [ltt-dev] General Questions
> 
> Can you try applying patch-2.6.26-0.12.tar.bz2 instead ? I may have
> forgot to refresh a patch in 0.11 before doing the release.
> 
> Mathieu
> 
> * Kevin Harms (harms at mcs.anl.gov) wrote:
> > 
> >   I'm having trouble building a lttng enabled kernel. I'm using the following command to patch a 2.6.26 kernel.
> > 
> > for f in $(cat ../lttng/patch-2.6.26-0.11/series | egrep -v "^#"); do patch --dry-run -p1 < ../lttng/patch-2.6.26-0.11/${f}; done
> > 
> >   Some of the patches apply correctly, but I get a few of these:
> > 
> > patching file kernel/module.c
> > Hunk #1 FAILED at 47.
> > Hunk #2 succeeded at 1386 (offset -1 lines).
> > Hunk #3 succeeded at 2162 (offset -17 lines).
> > 1 out of 3 hunks FAILED -- saving rejects to file kernel/module.c.rej
> > 
> >   I'm using kernel 2.6.26.
> > 
> > thanks,
> > kevin
> > 
> > ----- Original Message -----
> > From: "Michel Dagenais" <michel.dagenais at polymtl.ca>
> > To: "Kevin Harms" <harms at alcf.anl.gov>
> > Cc: ltt-dev at lists.casi.polymtl.ca
> > Sent: Tuesday, July 22, 2008 4:15:54 PM GMT -06:00 US/Canada Central
> > Subject: Re: [ltt-dev] General Questions
> > 
> > 
> > > I'm looking into an issue where fsync() is being called repeatedly by
> > > an application but some of those fsync() calls stall sometimes. Would
> > > LTT be useful for trying to see what is happening inside the kernel
> > > that causes those fsync() calls to stall?
> > 
> > Yes, very much! Fsync is relatively infrequent and easy to search for in
> > a trace. From there you need the detailed scheduling information to
> > understand why it is blocking, which is exactly what LTT will give you.
> > 
> > 
> > _______________________________________________
> > ltt-dev mailing list
> > ltt-dev at lists.casi.polymtl.ca
> > http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
> > 
> 
> -- 
> Mathieu Desnoyers
> OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
> 

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68