perf: Optimize buffer placement by allocating buffers NUMA aware

Ensure cpu bound buffers live on the right NUMA node.

Suggested-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1274114880.5605.5236.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 8d61d29..6ae6218 100644 (file)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -2320,6 +2320,19 @@ perf_mmap_to_page(struct perf_mmap_data *data, unsigned long pgoff)
        return virt_to_page(data->data_pages[pgoff - 1]);
 }
 
+static void *perf_mmap_alloc_page(int cpu)
+{
+       struct page *page;
+       int node;
+
+       node = (cpu == -1) ? cpu : cpu_to_node(cpu);
+       page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
+       if (!page)
+               return NULL;
+
+       return page_address(page);
+}
+
 static struct perf_mmap_data *
 perf_mmap_data_alloc(struct perf_event *event, int nr_pages)
 {
@@ -2336,12 +2349,12 @@ perf_mmap_data_alloc(struct perf_event *event, int nr_pages)
        if (!data)
                goto fail;
 
-       data->user_page = (void *)get_zeroed_page(GFP_KERNEL);
+       data->user_page = perf_mmap_alloc_page(event->cpu);
        if (!data->user_page)
                goto fail_user_page;
 
        for (i = 0; i < nr_pages; i++) {
-               data->data_pages[i] = (void *)get_zeroed_page(GFP_KERNEL);
+               data->data_pages[i] = perf_mmap_alloc_page(event->cpu);
                if (!data->data_pages[i])
                        goto fail_data_pages;
        }