hello,
As we expose unit masks directly to pplications using the libpfm,
some interfaces must be extended and/or added to make it easier
to managed unit masks.
For instance, in the latest release we have issues on Pentium 4
for the following function:
- pfm_get_cycle_event(): the default cycle event on P4 has a unit
mask defined, yet the function does not return it.
It is not too difficult to see that the other functions might have a
problems too, such as :
- pfm_get_retired_event()
Similarly, it would be nice to have function that knows directly how to
deal with event+unit mask all at once:
- pfm_find_event()
- pfm_get_event_name()
Let's take the example of pfm_find_event() which takes a string and
returns in a parameter, the event descriptor. It would be nice to have
another function (to maintain some backward compatiblity) that can take
an event string of the form "event_name:unit_mask1:unit_mask2" and return
both the event descriptor and the list of unit mask descriptors. The
function prototype could look as follows:
int pfm_find_event_and_masks(char *str, pfmlib_event_t *e);
We could do the same thing for pfm_get_event_name():
int pfm_get_event_and_masks_name(pfmlib_event_t *e, char *str, size_t
maxlen);
As for get_cycle_event and get_inst_retired_event, they could be modified
similarly:
- int pfm_get_cycle_event(pfmlib_event_t *e);
- int pfm_get_inst_retired_event(pfmlib_event_t *e);
Any opinion?
Anybody interested?
PS: some of the libpfm examples would need to be updated accordingly.
--
-Stephane
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