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authorFrederic Weisbecker <fweisbec@gmail.com>2010-08-14 20:45:13 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2010-08-19 01:32:53 +0200
commit7ae07ea3a48d30689ee037cb136bc21f0b37d8ae (patch)
tree2cb895a0794bcb2e45a4f48ef7e93302c1f6332c /include/linux/perf_event.h
parent927c7a9e92c4f69097a6e9e086d11fc2f8a5b40b (diff)
perf: Humanize the number of contexts
Instead of hardcoding the number of contexts for the recursions barriers, define a cpp constant to make the code more self-explanatory. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Stephane Eranian <eranian@google.com>
Diffstat (limited to 'include/linux/perf_event.h')
-rw-r--r--include/linux/perf_event.h14
1 files changed, 8 insertions, 6 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index d7e8ea690864..ae6fa6050925 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -808,6 +808,12 @@ struct perf_event_context {
struct rcu_head rcu_head;
};
+/*
+ * Number of contexts where an event can trigger:
+ * task, softirq, hardirq, nmi.
+ */
+#define PERF_NR_CONTEXTS 4
+
/**
* struct perf_event_cpu_context - per cpu event context structure
*/
@@ -821,12 +827,8 @@ struct perf_cpu_context {
struct mutex hlist_mutex;
int hlist_refcount;
- /*
- * Recursion avoidance:
- *
- * task, softirq, irq, nmi context
- */
- int recursion[4];
+ /* Recursion avoidance in each contexts */
+ int recursion[PERF_NR_CONTEXTS];
};
struct perf_output_handle {