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| author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2015-01-30 13:31:06 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-04-02 18:14:12 +0300 |
| commit | bed5b25ad9c8a2f5d735ef0bc746ec870c01c1b0 (patch) | |
| tree | de0dcc7cd008965e48e48644a37e3822453c1699 /include/linux/perf_event.h | |
| parent | 6a279230391b63130070e0219b0ad09d34d28c89 (diff) | |
| download | linux-bed5b25ad9c8a2f5d735ef0bc746ec870c01c1b0.tar.xz | |
perf: Add a pmu capability for "exclusive" events
Usually, pmus that do, for example, instruction tracing, would only ever
be able to have one event per task per cpu (or per perf_event_context). For
such pmus it makes sense to disallow creating conflicting events early on,
so as to provide consistent behavior for the user.
This patch adds a pmu capability that indicates such constraint on event
creation.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kaixu Xia <kaixu.xia@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Robert Richter <rric@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@infradead.org
Cc: adrian.hunter@intel.com
Cc: kan.liang@intel.com
Cc: markus.t.metzger@intel.com
Cc: mathieu.poirier@linaro.org
Link: http://lkml.kernel.org/r/1422613866-113186-1-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/perf_event.h')
| -rw-r--r-- | include/linux/perf_event.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 13a1eb3a2a2d..f936a1e51f29 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -176,6 +176,7 @@ struct perf_event; #define PERF_PMU_CAP_NO_NMI 0x02 #define PERF_PMU_CAP_AUX_NO_SG 0x04 #define PERF_PMU_CAP_AUX_SW_DOUBLEBUF 0x08 +#define PERF_PMU_CAP_EXCLUSIVE 0x10 /** * struct pmu - generic performance monitoring unit @@ -196,6 +197,7 @@ struct pmu { int * __percpu pmu_disable_count; struct perf_cpu_context * __percpu pmu_cpu_context; + atomic_t exclusive_cnt; /* < 0: cpu; > 0: tsk */ int task_ctx_nr; int hrtimer_interval_ms; |