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Date: Mon, 30 Jan 2012 09:27:03 +0530
From: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To: Stephane Eranian <eranian@...gle.com>
CC: linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
acme@...hat.com, robert.richter@....com, ming.m.lin@...el.com,
andi@...stfloor.org, asharma@...com, ravitillo@....gov,
vweaver1@...s.utk.edu, dsahern@...il.com
Subject: Re: [PATCH v4 09/18] perf: disable PERF_SAMPLE_BRANCH_* when not
supported
On Saturday 28 January 2012 02:26 AM, Stephane Eranian wrote:
> 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@...gle.com>
> ---
> arch/alpha/kernel/perf_event.c | 4 ++++
> arch/arm/kernel/perf_event.c | 4 ++++
> arch/mips/kernel/perf_event_mipsxx.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 5bb91bf..68bb0ce 100644
> --- a/arch/arm/kernel/perf_event.c
> +++ b/arch/arm/kernel/perf_event.c
> @@ -539,6 +539,10 @@ static int armpmu_event_init(struct perf_event *event)
> int err = 0;
> atomic_t *active_events = &armpmu->active_events;
>
> + /* does not support taken branch sampling */
> + if (has_branch_smpl(event))
ohh, this function is still present ? I could not find the function defined any where in the
patch set.
> + return -EOPNOTSUPP;
> +
> if (armpmu->map_event(event) == -ENOENT)
> return -ENOENT;
>
> diff --git a/arch/mips/kernel/perf_event_mipsxx.c b/arch/mips/kernel/perf_event_mipsxx.c
> index e3b897a..811084f 100644
> --- a/arch/mips/kernel/perf_event_mipsxx.c
> +++ b/arch/mips/kernel/perf_event_mipsxx.c
> @@ -606,6 +606,10 @@ 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 d614ab5..4e0b265 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 10b14e3..068b8a2 100644
> --- a/arch/sh/kernel/perf_event.c
> +++ b/arch/sh/kernel/perf_event.c
> @@ -310,6 +310,10 @@ 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 0397b23..0d8da03 100644
> --- a/arch/x86/kernel/cpu/perf_event_amd.c
> +++ b/arch/x86/kernel/cpu/perf_event_amd.c
> @@ -138,6 +138,9 @@ static int amd_pmu_hw_config(struct perf_event *event)
> if (ret)
> return ret;
>
> + if (has_branch_stack(event))
> + return -EOPNOTSUPP;
> +
> if (event->attr.exclude_host && event->attr.exclude_guest)
> /*
> * When HO == GO == 1 the hardware treats that as GO == HO == 0
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index c4520a2..431f7b4 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -5007,6 +5007,12 @@ 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:
> @@ -5117,6 +5123,12 @@ 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;
> @@ -5342,6 +5354,12 @@ 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;
> @@ -5416,6 +5434,12 @@ 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 b0309f7..cee5423 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;
--
Anshuman Khandual
Linux Technology Centre
IBM Systems and Technology Group
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