linux-kernel - [PATCH 5/6] perf: Optimise topology iteration

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Date:	Mon, 21 Feb 2011 00:57:39 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 5/6] perf: Optimise topology iteration

Currently we iterate the full machine looking for a matching core_id/nb
for the percore and the amd northbridge stuff , using a smaller topology
mask makes sense.

Signed-off-by: Lin Ming <ming.m.lin@...el.com>
---
 arch/x86/kernel/cpu/perf_event_amd.c   |    3 ++-
 arch/x86/kernel/cpu/perf_event_intel.c |    2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_amd.c b/arch/x86/kernel/cpu/perf_event_amd.c
index 461f62b..7217d84 100644
--- a/arch/x86/kernel/cpu/perf_event_amd.c
+++ b/arch/x86/kernel/cpu/perf_event_amd.c
@@ -320,6 +320,7 @@ static void amd_pmu_cpu_starting(int cpu)
 {
 	struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu);
 	struct amd_nb *nb;
+	const struct cpumask *mask = cpu_coregroup_mask(cpu);
 	int i, nb_id;
 
 	if (boot_cpu_data.x86_max_cores < 2)
@@ -328,7 +329,7 @@ static void amd_pmu_cpu_starting(int cpu)
 	nb_id = amd_get_nb_id(cpu);
 	WARN_ON_ONCE(nb_id == BAD_APICID);
 
-	for_each_online_cpu(i) {
+	for_each_cpu(i, mask) {
 		nb = per_cpu(cpu_hw_events, i).amd_nb;
 		if (WARN_ON_ONCE(!nb))
 			continue;
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index 059c0ab..5540d35 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -1123,7 +1123,7 @@ static void intel_pmu_cpu_starting(int cpu)
 	if (!ht_capable())
 		return;
 
-	for_each_online_cpu(i) {
+	for_each_cpu(i, topology_thread_cpumask(cpu)) {
 		struct intel_percore *pc = per_cpu(cpu_hw_events, i).per_core;
 
 		if (pc && pc->core_id == core_id) {
-- 
1.7.3



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