---

yaml --- r: 277316 b: refs/heads/master c: 4defea8 h: refs/heads/master v: v3
git-mirror · Dec 6, 2011 · dbab6e1 · dbab6e1
1 parent 3a14ac0
commit dbab6e1
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Showing 2 changed files with 15 additions and 6 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: bc1738f6ee83015f090867813dcca4d690e7917c
+refs/heads/master: 4defea8559bc0f97a899d94c8d19d3b8bb802bc4
diff --git a/trunk/arch/x86/kernel/cpu/perf_event.c b/trunk/arch/x86/kernel/cpu/perf_event.c
@@ -574,16 +574,25 @@ static bool __perf_sched_find_counter(struct perf_sched *sched)
 
 	c = sched->constraints[sched->state.event];
 
+	/* Prefer fixed purpose counters */
+	if (x86_pmu.num_counters_fixed) {
+		idx = X86_PMC_IDX_FIXED;
+		for_each_set_bit_cont(idx, c->idxmsk, X86_PMC_IDX_MAX) {
+			if (!__test_and_set_bit(idx, sched->state.used))
+				goto done;
+		}
+	}
 	/* Grab the first unused counter starting with idx */
 	idx = sched->state.counter;
-	for_each_set_bit_cont(idx, c->idxmsk, X86_PMC_IDX_MAX) {
+	for_each_set_bit_cont(idx, c->idxmsk, X86_PMC_IDX_FIXED) {
 		if (!__test_and_set_bit(idx, sched->state.used))
-			break;
+			goto done;
 	}
-	sched->state.counter = idx;
 
-	if (idx >= X86_PMC_IDX_MAX)
-		return false;
+	return false;
+
+done:
+	sched->state.counter = idx;
 
 	if (c->overlap)
 		perf_sched_save_state(sched);