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
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