> Except that the data passed for one or the other may not be the same.
> However, it is true that as of today the PMC information is a subset of
> the PMD's.
True the PMDs are generally scalar values while the PMCs are often
bitmasks of feature bits ... but so long as they both fit into the
same scalar type (u64?) then it shouldn't really matter. Are there
PMUs where this isn't true ... i.e. is there an architecture where
you could use u32 for PMC but need u64 for PMD?
> Are you also suggestion we merge the two syscalls to write the registers?
Yes. Just a variation on your suggestion of:
pfm_write_regs(int fd, int type, void *arg, size_t arg_sz)
Drop the "type" argument and have "arg" point to an array of
{regnum, data} pairs where negative regnum values refer to
PMC and positive ones to PMD.
-Tony
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