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| author | Stephane Eranian <eranian@google.com> | 2012-02-09 23:20:59 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2012-03-05 14:55:42 +0100 |
| commit | 2481c5fa6db0237e4f0168f88913178b2b495b7c (patch) | |
| tree | 4d0e8e9616c8e83ca2a72abbc3ac94621adc49be /kernel | |
| parent | 3e702ff6d1ea12dcf1c798ecb61e7f3a1579df42 (diff) | |
| download | op-kernel-dev-2481c5fa6db0237e4f0168f88913178b2b495b7c.zip op-kernel-dev-2481c5fa6db0237e4f0168f88913178b2b495b7c.tar.gz | |
perf: Disable PERF_SAMPLE_BRANCH_* when not supported
PERF_SAMPLE_BRANCH_* is disabled for:
- SW events (sw counters, tracepoints)
- HW breakpoints
- ALL but Intel x86 architecture
- AMD64 processors
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1328826068-11713-10-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/core.c | 24 | ||||
| -rw-r--r-- | kernel/events/hw_breakpoint.c | 6 |
2 files changed, 30 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 5820efd..242bb51 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -5044,6 +5044,12 @@ static int perf_swevent_init(struct perf_event *event) if (event->attr.type != PERF_TYPE_SOFTWARE) return -ENOENT; + /* + * no branch sampling for software events + */ + if (has_branch_stack(event)) + return -EOPNOTSUPP; + switch (event_id) { case PERF_COUNT_SW_CPU_CLOCK: case PERF_COUNT_SW_TASK_CLOCK: @@ -5154,6 +5160,12 @@ static int perf_tp_event_init(struct perf_event *event) if (event->attr.type != PERF_TYPE_TRACEPOINT) return -ENOENT; + /* + * no branch sampling for tracepoint events + */ + if (has_branch_stack(event)) + return -EOPNOTSUPP; + err = perf_trace_init(event); if (err) return err; @@ -5379,6 +5391,12 @@ static int cpu_clock_event_init(struct perf_event *event) if (event->attr.config != PERF_COUNT_SW_CPU_CLOCK) return -ENOENT; + /* + * no branch sampling for software events + */ + if (has_branch_stack(event)) + return -EOPNOTSUPP; + perf_swevent_init_hrtimer(event); return 0; @@ -5453,6 +5471,12 @@ static int task_clock_event_init(struct perf_event *event) if (event->attr.config != PERF_COUNT_SW_TASK_CLOCK) return -ENOENT; + /* + * no branch sampling for software events + */ + if (has_branch_stack(event)) + return -EOPNOTSUPP; + perf_swevent_init_hrtimer(event); return 0; diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c index 3330022..bb38c4d 100644 --- a/kernel/events/hw_breakpoint.c +++ b/kernel/events/hw_breakpoint.c @@ -581,6 +581,12 @@ static int hw_breakpoint_event_init(struct perf_event *bp) if (bp->attr.type != PERF_TYPE_BREAKPOINT) return -ENOENT; + /* + * no branch sampling for breakpoint events + */ + if (has_branch_stack(bp)) + return -EOPNOTSUPP; + err = register_perf_hw_breakpoint(bp); if (err) return err; |
