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perf: Humanize the number of contexts

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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>
This commit is contained in:
Frederic Weisbecker 2010-08-14 20:45:13 +02:00
parent 927c7a9e92
commit 7ae07ea3a4
3 changed files with 14 additions and 12 deletions
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14
include/linux/perf_event.h
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@ -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 {