Messages in this thread Patch in this message | | | From | Stephane Eranian <> | Subject | [PATCH 08/12] perf_events: disable PERF_SAMPLE_BRANCH_* when not supported | Date | Thu, 6 Oct 2011 16:49:11 +0200 |
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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> --- arch/alpha/kernel/perf_event.c | 4 ++++ arch/arm/kernel/perf_event.c | 4 ++++ arch/mips/kernel/perf_event.c | 4 ++++ arch/powerpc/kernel/perf_event.c | 4 ++++ arch/sh/kernel/perf_event.c | 4 ++++ arch/sparc/kernel/perf_event.c | 4 ++++ arch/x86/kernel/cpu/perf_event_amd.c | 3 +++ kernel/events/core.c | 24 ++++++++++++++++++++++++ kernel/events/hw_breakpoint.c | 6 ++++++ 9 files changed, 57 insertions(+), 0 deletions(-)
diff --git a/arch/alpha/kernel/perf_event.c b/arch/alpha/kernel/perf_event.c index 8143cd7..0dae252 100644 --- a/arch/alpha/kernel/perf_event.c +++ b/arch/alpha/kernel/perf_event.c @@ -685,6 +685,10 @@ static int alpha_pmu_event_init(struct perf_event *event) { int err; + /* does not support taken branch sampling */ + if (has_branch_stack(event)) + return -EOPNOTSUPP; + switch (event->attr.type) { case PERF_TYPE_RAW: case PERF_TYPE_HARDWARE: diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c index 53c9c26..bcb0dd1 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -544,6 +544,10 @@ static int armpmu_event_init(struct perf_event *event) { int err = 0; + /* does not support taken branch sampling */ + if (has_branch_smpl(event)) + return -EOPNOTSUPP; + switch (event->attr.type) { case PERF_TYPE_RAW: case PERF_TYPE_HARDWARE: diff --git a/arch/mips/kernel/perf_event.c b/arch/mips/kernel/perf_event.c index 0aee944..425c35a 100644 --- a/arch/mips/kernel/perf_event.c +++ b/arch/mips/kernel/perf_event.c @@ -370,6 +370,10 @@ static int mipspmu_event_init(struct perf_event *event) { int err = 0; + /* does not support taken branch sampling */ + if (has_branch_stack(event)) + return -EOPNOTSUPP; + switch (event->attr.type) { case PERF_TYPE_RAW: case PERF_TYPE_HARDWARE: diff --git a/arch/powerpc/kernel/perf_event.c b/arch/powerpc/kernel/perf_event.c index 10a140f..5701051 100644 --- a/arch/powerpc/kernel/perf_event.c +++ b/arch/powerpc/kernel/perf_event.c @@ -1078,6 +1078,10 @@ static int power_pmu_event_init(struct perf_event *event) if (!ppmu) return -ENOENT; + /* does not support taken branch sampling */ + if (has_branch_stack(event)) + return -EOPNOTSUPP; + switch (event->attr.type) { case PERF_TYPE_HARDWARE: ev = event->attr.config; diff --git a/arch/sh/kernel/perf_event.c b/arch/sh/kernel/perf_event.c index 2ee21a4..7cc9066 100644 --- a/arch/sh/kernel/perf_event.c +++ b/arch/sh/kernel/perf_event.c @@ -309,6 +309,10 @@ static int sh_pmu_event_init(struct perf_event *event) { int err; + /* does not support taken branch sampling */ + if (has_branch_stack(event)) + return -EOPNOTSUPP; + switch (event->attr.type) { case PERF_TYPE_RAW: case PERF_TYPE_HW_CACHE: diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c index 614da62..8e16a4a 100644 --- a/arch/sparc/kernel/perf_event.c +++ b/arch/sparc/kernel/perf_event.c @@ -1105,6 +1105,10 @@ static int sparc_pmu_event_init(struct perf_event *event) if (atomic_read(&nmi_active) < 0) return -ENODEV; + /* does not support taken branch sampling */ + if (has_branch_stack(event)) + return -EOPNOTSUPP; + switch (attr->type) { case PERF_TYPE_HARDWARE: if (attr->config >= sparc_pmu->max_events) diff --git a/arch/x86/kernel/cpu/perf_event_amd.c b/arch/x86/kernel/cpu/perf_event_amd.c index 941caa2..81a9b5a 100644 --- a/arch/x86/kernel/cpu/perf_event_amd.c +++ b/arch/x86/kernel/cpu/perf_event_amd.c @@ -132,6 +132,9 @@ static int amd_pmu_hw_config(struct perf_event *event) if (ret) return ret; + if (has_branch_stack(event)) + return -EOPNOTSUPP; + if (event->attr.type != PERF_TYPE_RAW) return 0; diff --git a/kernel/events/core.c b/kernel/events/core.c index 70a8975..e5caab5 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -5104,6 +5104,12 @@ 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: @@ -5207,6 +5213,12 @@ 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; @@ -5430,6 +5442,12 @@ 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; @@ -5502,6 +5520,12 @@ 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 b7971d6..e7fb781 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; -- 1.7.4.1
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