On Mon, 1 Apr 2013 14:36:52 +0200 Alexander Leidinger <[email protected]> wrote: > > On Wed, 27 Mar 2013 18:07:14 -0400 > "J.R. Oldroyd" <[email protected]> wrote: > > > Is there any known magic involved in getting DTrace to do its thing on > > 9.1-release? > > > > I am trying to use it to debug a memory leak problem with the > > radeonkms driver under 9.x. > > Can you check if you have the same dtrace-problem with -current? I > would expect that 9.1 already has some dtrace-fixes regarding new > probes in run-time loaded modules, this is just to verify this > assumption. > > Assuming there is some kind of dead-lock in this module-load interaction > with dtrace, you could modify the radeonkms module to do it's > initialization magic once a sysctl is set to 1, instead of doing this > magic at module-load time. This way you could load the module, start > the dtrace script and then issue the magic sysctl. > > Bye, > Alexander. >
Thanks for the suggestion.
The problem I was hoping to use DTrace to debug turned out to be
an incompletely back-ported vm_alloc_page_contig() function. This
was discovered using careful code analysis. Having improved the
back-port of this function, the radeonkms driver is now running
fine on 9.1-release. The need for DTtrace has therefore gone away
for the time being.
That said, the back-port of the VM function is not 100%, yet.
I've had to put this on hold due to other commitments, but when
I get back to this, I probably need to talk to our VM experts to
get a list of commits that will be needed to properly merge that
function into 9-stable.
-jr
signature.asc
Description: PGP signature
