Hi Paul Thx for your answer.
Well, I tried to apply the IBS perf_event_open patches of Robert. But since these kernel patches are almost an year old, parts of them are not possible to apply because they are outdated. The strange thing is, that there's a lot of IBS code in the oprofile driver module. At least I can see that IBS works with oprofile, but I guess I can't use oprofile for my purposes. The current libpfm4 reports only the IBS_OPS_TAGGED ibs event on my AMD Opteron 6128 machine. No idea what this event means. I guess I need the IBS_FETCH_* stuff. libpfm4/examples# ./showevtinfo ibs . IDX : 134217846 PMU name : amd64_fam10h_istanbul (AMD64 Fam10h Istanbul) Name : IBS_OPS_TAGGED Equiv : None Flags : None Desc : IBS Ops Tagged Code : 0x1cf Modif-00 : 0x00 : PMU : [k] : monitor at priv level 0 (boolean) Modif-01 : 0x01 : PMU : [u] : monitor at priv level 1, 2, 3 (boolean) Modif-02 : 0x02 : PMU : [e] : edge level (boolean) Modif-03 : 0x03 : PMU : [i] : invert (boolean) Modif-04 : 0x04 : PMU : [c] : counter-mask in range [0-255] (integer) Modif-05 : 0x05 : PMU : [h] : monitor in hypervisor (boolean) Modif-06 : 0x06 : PMU : [g] : measure in guest (boolean) Well, maybe I have to switch my project to Intel Nehalem architecture until this IBS stuff is usable/documented with libpfm4/perf_event_open. -Ivo Am 06.06.2011 15:57, schrieb Drongowski, Paul: > Hello Ivo -- > > Yep, you will need to use the AMD IBS feature. > > Sampling the performance monitoring counters (PMCs) is imprecise. > When a PMC (overflow) generates an interrupt, the processing pipeline is most > probably far beyond the actual instruction which caused the PMC (overflow) > that triggers the sampling interrupt. Thus, it's not possible to capture the > data operand address for instructions that access memory via PMC sampling. > > IBS has this capability. After the IBS hardware selects and tags an > execution op for sampling, it records the precise IP and events for > the op. The IP is the address of the parent x86 op. If the op is a load > or store, the data operand address is captured, too. > > Robert is the right guy for software questions. (I'm doing hardware now. :-) > > -- pj > > Paul Drongowski > Consultant at AMD > > -----Original Message----- > From: Ivo Steinmann [mailto:isteinm...@bluewin.ch] > Sent: Sunday, June 05, 2011 7:44 PM > To: perfmon2-devel@lists.sourceforge.net > Subject: [perfmon2] AMD IBS Support > > Hello all > > I'm really new to all this performance monitoring stuff. > > I would like to monitor cache accesses on my amd64 phenom and opteron machine > and I also would like to get the address that is accessed. So I tried > DATA_CACHE_ACCESSES, REQUESTS_TO_L2, READ_REQUEST_TO_L3_CACHE. > It's working so far as the events are raised (using sigaction mechanism). > > attr.wakeup_events = 1; > attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_ADDR; //| > PERF_SAMPLE_READ | PERF_SAMPLE_PERIOD; > attr.sample_period = SMPL_PERIOD; > attr.read_format = 0;//PERF_FORMAT_GROUP | PERF_FORMAT_ID | > PERF_FORMAT_TOTAL_TIME_ENABLED | PERF_FORMAT_TOTAL_TIME_RUNNING; > > > But somehow the addr is allways zero (nil) :( > > I think I have to use the amd64 IBS stuff (I guess then an address is > returned). I found this thread: http://lkml.org/lkml/2010/4/13/336 from > Robert Richter. There he provides some patches for amd64 ibs support. > And here an example for libpfm4: https://lkml.org/lkml/2010/10/18/329 > > Are this patches obsolete? How can I use IBS with libpfm4? > > I'm using this kernel version: > git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile.git > > And libpfm4 from: > git://perfmon2.git.sourceforge.net/gitroot/perfmon2/libpfm4 > > Thx > Ivo Steinmann > > ------------------------------------------------------------------------------ > Simplify data backup and recovery for your virtual environment with vRanger. > Installation's a snap, and flexible recovery options mean your data is safe, > secure and there when you need it. Discover what all the cheering's about. > Get your free trial download today. > http://p.sf.net/sfu/quest-dev2dev2 > _______________________________________________ > perfmon2-devel mailing list > perfmon2-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/perfmon2-devel > > > ------------------------------------------------------------------------------ EditLive Enterprise is the world's most technically advanced content authoring tool. Experience the power of Track Changes, Inline Image Editing and ensure content is compliant with Accessibility Checking. http://p.sf.net/sfu/ephox-dev2dev _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
