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  1. 29 4月, 2009 9 次提交
  3. 09 4月, 2009 1 次提交
  5. 07 4月, 2009 2 次提交
  7. 06 4月, 2009 12 次提交
  9. 08 3月, 2009 2 次提交
  11. 06 3月, 2009 2 次提交
  13. 02 3月, 2009 2 次提交
  15. 28 2月, 2009 2 次提交
  17. 11 2月, 2009 1 次提交
    • P
      perf_counters: allow users to count user, kernel and/or hypervisor events · 0475f9ea
      由 Paul Mackerras 提交于 
      Impact: new perf_counter feature

This extends the perf_counter_hw_event struct with bits that specify
that events in user, kernel and/or hypervisor mode should not be
counted (i.e. should be excluded), and adds code to program the PMU
mode selection bits accordingly on x86 and powerpc.

For software counters, we don't currently have the infrastructure to
distinguish which mode an event occurs in, so we currently fail the
counter initialization if the setting of the hw_event.exclude_* bits
would require us to distinguish.  Context switches and CPU migrations
are currently considered to occur in kernel mode.

On x86, this changes the previous policy that only root can count
kernel events.  Now non-root users can count kernel events or exclude
them.  Non-root users still can't use NMI events, though.  On x86 we
don't appear to have any way to control whether hypervisor events are
counted or not, so hw_event.exclude_hv is ignored.

On powerpc, the selection of whether to count events in user, kernel
and/or hypervisor mode is PMU-wide, not per-counter, so this adds a
check that the hw_event.exclude_* settings are the same as other events
on the PMU.  Counters being added to a group have to have the same
settings as the other hardware counters in the group.  Counters and
groups can only be enabled in hw_perf_group_sched_in or power_perf_enable
if they have the same settings as any other counters already on the
PMU.  If we are not running on a hypervisor, the exclude_hv setting
is ignored (by forcing it to 0) since we can't ever get any
hypervisor events.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
      0475f9ea
  19. 09 2月, 2009 1 次提交
  21. 05 2月, 2009 1 次提交
  23. 23 1月, 2009 3 次提交
  25. 27 12月, 2008 1 次提交
  27. 23 12月, 2008 1 次提交
    • I
      x86, perfcounters: add support for fixed-function pmcs · 2f18d1e8
      由 Ingo Molnar 提交于 
      Impact: extend performance counter support on x86 Intel CPUs

Modern Intel CPUs have 3 "fixed-function" performance counters, which
count these hardware events:

    Instr_Retired.Any
    CPU_CLK_Unhalted.Core
    CPU_CLK_Unhalted.Ref

Add support for them to the performance counters subsystem.

Their use is transparent to user-space: the counter scheduler is
extended to automatically recognize the cases where a fixed-function
PMC can be utilized instead of a generic PMC. In such cases the
generic PMC is kept available for more counters.

The above fixed-function events map to these generic counter hw events:

        PERF_COUNT_INSTRUCTIONS
        PERF_COUNT_CPU_CYCLES
        PERF_COUNT_BUS_CYCLES

(The 'bus' cycles are in reality often CPU-ish cycles, just with a fixed
 frequency.)
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      2f18d1e8