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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>
This commit is contained in:
Peter Zijlstra 2010-05-17 18:48:00 +02:00 committed by Ingo Molnar
parent 00d1d0b095
commit a19d35c11f
1 changed files with 15 additions and 2 deletions
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17
kernel/perf_event.c
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@ -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;
}