Re: [perfmon2] 2.6.26 new perfmon kernel patch + libpfm + pfmon available

[Gary.Mohr@Bull.com]

Stephane

I was wondering if there is or will be a version of this new patch for the
2.6.18 kernel.

As I mentioned before I am trying to apply the 2.6.18 patch to an RHEL5
distribution and the patches in the ptrace area do not fit at all.  I think
this is due to redhat replacing ptrace with utrace so your comments about
experimental utrace support peaked my interest.

I have the 2.6.18 patches installed now in RHEL5 on an x86_64 platform
except the ptrace related stuff which is just commented out.  I can boot
the kernel with these patches but I can not get pfmon/libpfm version 3.4 to
run.  I get an error that looks like this:

can't create perfmon context: Bad file descriptor

When I turned on the kernel debug with pfdbg, I found this pair of messages
in the kernel debug messages:

perfmon: pfm_get_ctx.83: CPU4 [4167]: invalid fd 197893600
perfmon: pfm_get_ctx.83: CPU4 [4167]: invalid fd 351017808

Each time I run pfmon I get two new kernel messages.  The CPU number, value
is square brackets and fd value change each time.

If you have seen this before and can point me to what I screwed up, that
would be better than I probably deserve but if not I will just keep adding
debug print messages to the kernel patch to figure out what is going on.

Gary