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authorVince Weaver <vincent.weaver@maine.edu>2014-05-16 17:12:12 -0400
committerIngo Molnar <mingo@kernel.org>2014-06-05 12:29:55 +0200
commit53b25335dd60981ad608da7890420898a34469a6 (patch)
tree284d8fbb69e661ea4966d96b85b44b9ef94e7e25 /kernel/events
parentebf905fc7a6e7c99c53b5afc888d8f950da90aff (diff)
downloadop-kernel-dev-53b25335dd60981ad608da7890420898a34469a6.zip
op-kernel-dev-53b25335dd60981ad608da7890420898a34469a6.tar.gz
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>
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/core.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index a62d142..e9ef0c6 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);
/*
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