Hi Stephan,
As you might have guessed, one of our goals has been to be able to run
the libpfm examples cleanly on Power.
multiplex.c gives odd error messages about calls to pfm_write_pmds and
pfm_write_pmcs depending on the options given. I tracked this down to
the allocation of the all_pmcs array on line 1146:
all_pmcs = calloc(1, sizeof(pfarg_pmc_t)*total_events);
The number of PKCs on to allocate on Power is not directly related to
the total events. In this case, there are four total events, but we
need 6 pmc registers (3 for each set). On Power, it's always 3
registers per set. I would guess that other architectures might have
similar issues.
Because not enough space is allocated, we end up overwriting memory that
is located after the array, causing corruption of memory. This
results in various bad things happening, as you might imagine.
As a temporary work-around, I changed the multiplier from total_events
to just '20'. This fixed the problem and the test runs correctly, at
least with the default options.
Any ideas about a better fix than this?
Regards,
- Corey
Corey Ashford
Software Engineer
IBM Linux Technology Center, Linux Toolchain
Beaverton, OR
503-578-3507
[email protected]
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