perf: Avoid the percore allocations if the CPU is not HT capable

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1299119690-13991-5-git-send-email-ming.m.lin@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 1f46951..c1bbfa8 100644 (file)
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -17,10 +17,20 @@
 #endif
 #include <asm/thread_info.h>
 #include <asm/cpumask.h>
+#include <asm/cpufeature.h>
 
 extern int smp_num_siblings;
 extern unsigned int num_processors;
 
+static inline bool cpu_has_ht_siblings(void)
+{
+       bool has_siblings = false;
+#ifdef CONFIG_SMP
+       has_siblings = cpu_has_ht && smp_num_siblings > 1;
+#endif
+       return has_siblings;
+}
+
 DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_map);
 DECLARE_PER_CPU(cpumask_var_t, cpu_core_map);
 DECLARE_PER_CPU(u16, cpu_llc_id);

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 4d6ce5d..2660418 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -30,6 +30,7 @@
 #include <asm/stacktrace.h>
 #include <asm/nmi.h>
 #include <asm/compat.h>
+#include <asm/smp.h>
 
 #if 0
 #undef wrmsrl

diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index 6e9b676..8fc2b2c 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -1205,6 +1205,9 @@ static int intel_pmu_cpu_prepare(int cpu)
 {
        struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu);
 
+       if (!cpu_has_ht_siblings())
+               return NOTIFY_OK;
+
        cpuc->per_core = kzalloc_node(sizeof(struct intel_percore),
                                      GFP_KERNEL, cpu_to_node(cpu));
        if (!cpuc->per_core)
@@ -1221,6 +1224,15 @@ static void intel_pmu_cpu_starting(int cpu)
        int core_id = topology_core_id(cpu);
        int i;
 
+       init_debug_store_on_cpu(cpu);
+       /*
+        * Deal with CPUs that don't clear their LBRs on power-up.
+        */
+       intel_pmu_lbr_reset();
+
+       if (!cpu_has_ht_siblings())
+               return;
+
        for_each_cpu(i, topology_thread_cpumask(cpu)) {
                struct intel_percore *pc = per_cpu(cpu_hw_events, i).per_core;
 
@@ -1233,12 +1245,6 @@ static void intel_pmu_cpu_starting(int cpu)
 
        cpuc->per_core->core_id = core_id;
        cpuc->per_core->refcnt++;
-
-       init_debug_store_on_cpu(cpu);
-       /*
-        * Deal with CPUs that don't clear their LBRs on power-up.
-        */
-       intel_pmu_lbr_reset();
 }
 
 static void intel_pmu_cpu_dying(int cpu)