x86, perf_counter, bts: Add BTS support to perfcounters

Browse source

Implement a performance counter with:

    attr.type           = PERF_TYPE_HARDWARE
    attr.config         = PERF_COUNT_HW_BRANCH_INSTRUCTIONS
    attr.sample_period  = 1

Using branch trace store (BTS) on x86 hardware, if available.

The from and to address for each branch can be sampled using:

    PERF_SAMPLE_IP      for the from address
    PERF_SAMPLE_ADDR    for the to address

[ v2: address review feedback, fix bugs ]

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

This commit is contained in:

Markus Metzger 2009-07-21 15:56:48 +02:00 • committed by Ingo Molnar

parent 183f3b0887

commit 30dd568c91

4 changed files with 340 additions and 7 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

10

arch/x86/include/asm/perf_counter.h

View file

325

arch/x86/kernel/cpu/perf_counter.c

View file

2

include/linux/perf_counter.h

View file

10

kernel/perf_counter.c

View file