On Tue, Apr 27, 2010 at 11:31 PM, Philip Mucci <mu...@eecs.utk.edu> wrote: > Hi Dan, > > See the 'overflow' examples in the libpfm directory. (I'm assuming > they exist in libpfm4) You don't really want buffered sampling here, > because you are taking the interrupt directly as a signal rather than > buffering the information. > For perf_events, there is an example that does just that. It is called notify_self. You get notified for each sample. Note that with perf_events you need a kernel sampling buffer, even if you want to get notified for each sample.
> Also, you don't need PEBS for this, since you are not looking for the > precise IP upon sample time... > No PEBS needed, I agree. > Conversely, you could simply use the process_smpl_buffer example, but > make sure your sample buffer only has enough room for one sample. That > will likely cause more overhead... > > Hope this helps. > I am still wondering why you need to use the PMU to get a signal every 1ms. You may as well use a regular timer via setiitmer(). > Philip > www.samaratechnologygroup.com > > > On Apr 27, 2010, at 2:02 PM, Dan Upton wrote: > >> Hi all- >> >> I'm trying to get an interrupt every 1m instructions so that I can >> read some other information in the system (such as the temperature >> sensor on a Core 2). I tried building off of pebs_smpl from the >> libpfm4 git tree, but I can't figure out what I would need to do to >> get notified every sample: if I'm understanding it correctly, >> process_smpl_buffer is only called once some buffer in memory >> overflows. Is there a reasonable way using libpfm4 (or anything >> from perf) to get notified at every interrupt? >> >> Thanks, >> -dan >> ------------------------------------------------------------------------------ >> _______________________________________________ >> perfmon2-devel mailing list >> perfmon2-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/perfmon2-devel > > > ------------------------------------------------------------------------------ > _______________________________________________ > perfmon2-devel mailing list > perfmon2-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/perfmon2-devel > ------------------------------------------------------------------------------ _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
