perf, x86: Use NUMA aware allocations for PEBS/BTS/DS allocations

For performance reasons its best to use memory node local memory for
per-cpu buffers.

This logic comes from a much larger patch proposed by Stephane.

Suggested-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Stephane Eranian <eranian@google.com>
LKML-Reference: <20101019134808.514465326@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 8a7f81cbd617646e7da862cc6553af0046d090f1..b7dcd9f2b8a04b8204762e50700264570e8ce498 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -77,13 +77,14 @@ static void fini_debug_store_on_cpu(int cpu)
 static int alloc_pebs_buffer(int cpu)
 {
        struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
+       int node = cpu_to_node(cpu);
        int max, thresh = 1; /* always use a single PEBS record */
        void *buffer;
 
        if (!x86_pmu.pebs)
                return 0;
 
-       buffer = kzalloc(PEBS_BUFFER_SIZE, GFP_KERNEL);
+       buffer = kmalloc_node(PEBS_BUFFER_SIZE, GFP_KERNEL | __GFP_ZERO, node);
        if (unlikely(!buffer))
                return -ENOMEM;
 
@@ -114,13 +115,14 @@ static void release_pebs_buffer(int cpu)
 static int alloc_bts_buffer(int cpu)
 {
        struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
+       int node = cpu_to_node(cpu);
        int max, thresh;
        void *buffer;
 
        if (!x86_pmu.bts)
                return 0;
 
-       buffer = kzalloc(BTS_BUFFER_SIZE, GFP_KERNEL);
+       buffer = kmalloc_node(BTS_BUFFER_SIZE, GFP_KERNEL | __GFP_ZERO, node);
        if (unlikely(!buffer))
                return -ENOMEM;
 
@@ -150,9 +152,10 @@ static void release_bts_buffer(int cpu)
 
 static int alloc_ds_buffer(int cpu)
 {
+       int node = cpu_to_node(cpu);
        struct debug_store *ds;
 
-       ds = kzalloc(sizeof(*ds), GFP_KERNEL);
+       ds = kmalloc_node(sizeof(*ds), GFP_KERNEL | __GFP_ZERO, node);
        if (unlikely(!ds))
                return -ENOMEM;