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| author | Vince Weaver <vincent.weaver@maine.edu> | 2014-05-16 17:12:12 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-06-05 12:29:55 +0200 |
| commit | 53b25335dd60981ad608da7890420898a34469a6 (patch) | |
| tree | 284d8fbb69e661ea4966d96b85b44b9ef94e7e25 | |
| parent | ebf905fc7a6e7c99c53b5afc888d8f950da90aff (diff) | |
| download | linux-53b25335dd60981ad608da7890420898a34469a6.tar.gz linux-53b25335dd60981ad608da7890420898a34469a6.tar.bz2 linux-53b25335dd60981ad608da7890420898a34469a6.zip | |
perf: Disable sampled events if no PMU interrupt
Add common code to generate -ENOTSUPP at event creation time if an
architecture attempts to create a sampled event and
PERF_PMU_NO_INTERRUPT is set.
This adds a new pmu->capabilities flag. Initially we only support
PERF_PMU_NO_INTERRUPT (to indicate a PMU has no support for generating
hardware interrupts) but there are other capabilities that can be
added later.
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Acked-by: Will Deacon <will.deacon@arm.com>
[peterz: rename to PERF_PMU_CAP_* and moved the pmu::capabilities word into a hole]
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1405161708060.11099@vincent-weaver-1.umelst.maine.edu
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | include/linux/perf_event.h | 10 | ||||
| -rw-r--r-- | kernel/events/core.c | 7 |
2 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index af6dcf1d9e47..267c8f37012c 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -167,6 +167,11 @@ struct perf_event; #define PERF_EVENT_TXN 0x1 /** + * pmu::capabilities flags + */ +#define PERF_PMU_CAP_NO_INTERRUPT 0x01 + +/** * struct pmu - generic performance monitoring unit */ struct pmu { @@ -178,6 +183,11 @@ struct pmu { const char *name; int type; + /* + * various common per-pmu feature flags + */ + int capabilities; + int * __percpu pmu_disable_count; struct perf_cpu_context * __percpu pmu_cpu_context; int task_ctx_nr; diff --git a/kernel/events/core.c b/kernel/events/core.c index a62d142ad498..e9ef0c6646af 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7120,6 +7120,13 @@ SYSCALL_DEFINE5(perf_event_open, } } + if (is_sampling_event(event)) { + if (event->pmu->capabilities & PERF_PMU_CAP_NO_INTERRUPT) { + err = -ENOTSUPP; + goto err_alloc; + } + } + account_event(event); /* |