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authorAlexander Shishkin <alexander.shishkin@linux.intel.com>2015-01-30 13:31:06 +0300
committerIngo Molnar <mingo@kernel.org>2015-04-02 18:14:12 +0300
commitbed5b25ad9c8a2f5d735ef0bc746ec870c01c1b0 (patch)
treede0dcc7cd008965e48e48644a37e3822453c1699 /include/linux/perf_event.h
parent6a279230391b63130070e0219b0ad09d34d28c89 (diff)
downloadlinux-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.h2
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;