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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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8
kernel/trace/trace_event_perf.c
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@ -9,7 +9,7 @@
#include <linux/kprobes.h>
#include "trace.h"
static char *perf_trace_buf[4];
static char *perf_trace_buf[PERF_NR_CONTEXTS];
/*
* Force it to be aligned to unsigned long to avoid misaligned accesses
@ -45,7 +45,7 @@ static int perf_trace_event_init(struct ftrace_event_call *tp_event,
char *buf;
int i;
for (i = 0; i < 4; i++) {
for (i = 0; i < PERF_NR_CONTEXTS; i++) {
buf = (char *)alloc_percpu(perf_trace_t);
if (!buf)
goto fail;
@ -65,7 +65,7 @@ fail:
if (!total_ref_count) {
int i;
for (i = 0; i < 4; i++) {
for (i = 0; i < PERF_NR_CONTEXTS; i++) {
free_percpu(perf_trace_buf[i]);
perf_trace_buf[i] = NULL;
}
@ -140,7 +140,7 @@ void perf_trace_destroy(struct perf_event *p_event)
tp_event->perf_events = NULL;
if (!--total_ref_count) {
for (i = 0; i < 4; i++) {
for (i = 0; i < PERF_NR_CONTEXTS; i++) {
free_percpu(perf_trace_buf[i]);
perf_trace_buf[i] = NULL;
}