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Message-ID: <CABPqkBTvMb6_Lif6-+aH0owAd0ar8MSf2iguVYnwJuXwy5RK_A@mail.gmail.com>
Date: Fri, 27 Jan 2012 10:56:45 +0100
From: Stephane Eranian <eranian@...gle.com>
To: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
acme@...radead.org, robert.richter@....com, ming.m.lin@...el.com,
andi@...stfloor.org, asharma@...com, ravitillo@....gov,
vweaver1@...s.utk.edu
Subject: Re: [PATCH 09/13] perf_events: disable PERF_SAMPLE_BRANCH_* when not
supported (v3)
On Fri, Jan 27, 2012 at 8:15 AM, Anshuman Khandual
<khandual@...ux.vnet.ibm.com> wrote:
> On Monday 09 January 2012 10:19 PM, 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 88b0941..42262ff 100644
>> --- a/arch/arm/kernel/perf_event.c
>> +++ b/arch/arm/kernel/perf_event.c
>> @@ -540,6 +540,10 @@ 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))
> I guess this would be 'has_branch_stack' instead of 'has_branch_smpl'.
> 'has_branch_smpl' has not been defined any where but getting called here.
Good catch. Will post a patch to fix that.
>> + 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 315fc0b..7070f8c 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 ed39225..36d1a63 100644
>> --- a/kernel/events/core.c
>> +++ b/kernel/events/core.c
>> @@ -5000,6 +5000,12 @@ 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:
>> @@ -5110,6 +5116,12 @@ 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;
>> @@ -5335,6 +5347,12 @@ 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;
>> @@ -5409,6 +5427,12 @@ 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;
>
>
> --
> Linux Technology Centre
> IBM Systems and Technology Group
> Bangalore India
>
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