Ah! Great, thank you Manuel!!
On 25/06/15 21:06, Manuel Selva wrote:
Hello Harald,
Setting the config1 field of the perf_event_attr field (as done by the
perf mem record tool) to X will instruct the PMU to only sample loads
with latency higher than X. Is it what you are looking for ?
----
Manu
On 06/25/2015 06:00 PM, Harald Servat wrote:
On 04/05/15 00:19, Vince Weaver wrote:
On Mon, 4 May 2015, Harald Servat wrote:
Dear list,
I'd like to use the perf library to access PEBS so as to collect
referenced
memory addresses from the user space. I think I've successfully setup
the perf
structures (struct perf_event_attr) to configure the performance
counters, but
I don't see what should I do to access to the captured memory
addresses. I've
seen that within arch/x86/kernel/cpu/perf_event_intel_ds.c there are
the
routines alloc_pebs_buffer, alloc_ds_buffer which seems to allocate
and setup
the necessary buffers using kmalloc_node calls. Question is, how can
replicate
this from the user space? And how we should connect these buffers to
the PEBS
infrastructure using perf calls?
You can try looking at the example code in my perf_event_tests code.
https://github.com/deater/perf_event_tests
The stuff you are looking for is probably covered in the
test/record_sample/samples_data_src
test/record_sample/sample_weight
and especially the
test/record_sample/sample_regs_intr
tests, although that last one requires a fairly recent kernel to work.
Vince
Hello,
is there a way to setup PEBS to collect information from loads that
take at least X cycles to complete using MSR_PEBS_LD_LAT_THRESHOLD
through this approach?
Thank you!
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