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| author | Peter Zijlstra <peterz@infradead.org> | 2010-05-17 18:48:00 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-05-18 18:35:47 +0200 |
| commit | a19d35c11fd559dd7dfd5a2078df7c9af74a5d88 (patch) | |
| tree | 54cc4f3f5813eb7afd81d089d581a098df896f11 /kernel/perf_event.c | |
| parent | 00d1d0b095ba4e5c0958cb228b2a9c445d4a339d (diff) | |
| download | lwn-a19d35c11fd559dd7dfd5a2078df7c9af74a5d88.tar.gz lwn-a19d35c11fd559dd7dfd5a2078df7c9af74a5d88.zip | |
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>
Diffstat (limited to 'kernel/perf_event.c')
| -rw-r--r-- | kernel/perf_event.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 8d61d292f719..6ae62186dd0c 100644 --- 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; } |