- Document some EINVAL error returns from PMC_OP_CONFIGURELOG,
PMC_OP_WRITELOG and PMC_OP_FLUSHLOG that were missed earlier.
- Correct a typo: s/PMC_OP_ALLOCATE/PMC_OP_PMCALLOCATE/.
- Describe how log file writing errors are returned by a PMC_OP_FLUSHLOG
request.
PMCs and 'mode' to distinguish between counting and sampling.
- Document PMC row dispositions.
- Document the requirement for PRIV_PMC_MANAGE privilege when issuing
PMC_OP_PMCADMIN requests.
request are 32 bit values, and are not necessarily small.
- Note that the PMC_F_KGMON flag is currently unimplemented.
- Tweak description of an EINVAL error return.
- Add an "AUTHORS" section.
list of diagnostic messages sorted.
Document the recently introduced EOPNOTSUPP error return. Repair
sort ordering for the list of error descriptions.
MFC after: 3 days
- Implement sampling modes and logging support in hwpmc(4).
- Separate MI and MD parts of hwpmc(4) and allow sharing of
PMC implementations across different architectures.
Add support for P4 (EMT64) style PMCs to the amd64 code.
- New pmcstat(8) options: -E (exit time counts) -W (counts
every context switch), -R (print log file).
- pmc(3) API changes, improve our ability to keep ABI compatibility
in the future. Add more 'alias' names for commonly used events.
- bug fixes & documentation.
Have pmcstat(8) and pmccontrol(8) use these APIs.
Return PMC class-related constants (PMC widths and capabilities)
with the OP GETCPUINFO call leaving OP PMCINFO to return only the
dynamic information associated with a PMC (i.e., whether enabled,
owner pid, reload count etc.).
Allow pmc_read() (i.e., OPS PMCRW) on active self-attached PMCs to
get upto-date values from hardware since we can guarantee that the
hardware is running the correct PMC at the time of the call.
Bug fixes:
- (x86 class processors) Fix a bug that prevented an RDPMC
instruction from being recognized as permitted till after the
attached process had context switched out and back in again after
a pmc_start() call.
Tighten the rules for using RDPMC class instructions: a GETMSR
OP is now allowed only after an OP ATTACH has been done by the
PMC's owner to itself. OP GETMSR is not allowed for PMCs that
track descendants, for PMCs attached to processes other than
their owner processes.
- (P4/HTT processors only) Fix a bug that caused the MI and MD
layers to get out of sync. Add a new MD operation 'get_config()'
as part of this fix.
- Allow multiple system-mode PMCs at the same row-index but on
different CPUs to be allocated.
- Reject allocation of an administratively disabled PMC.
Misc. code cleanups and refactoring. Improve a few comments.
