Re: [pcp] PCP Network Latency PMDA

["Frank Ch. Eigler" <fche@xxxxxxxxxx>]

Hi -

> $ ../install/bin/stap  ../../net_xmit_mmv.stp em1 loem1 0
> lo 1
> argv[1] = em1, inst[em1] = 0
> argv[2] = lo, inst[lo] = 1
> 
> In another window can get information out with mmvdump:
> [...]

OK, it should take only one small step past this before getting the
data through normal pcp clients: namely arranging for that /mmv
file to be visible to the mmv pmda agent process.  To do that,
add to the mmv.stp tapset something like this:

probe begin {
  system(sprintf("ln -s /proc/systemtap/%s/mmv /var/lib/pcp/tmp/mmv/%s",
                 module_name(), module_name()))
}
probe end,error {
  system(sprintf("rm -f /var/lib/pcp/tmp/mmv/%s",
                 module_name()))
}

Then, something like  

% pminfo -f mmv

should show the values.


- FChE