linux-kernel - [PATCH] perf core: Allocate perf_buffer in the target node memory

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Date:   Mon, 15 Mar 2021 12:34:36 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH] perf core: Allocate perf_buffer in the target node memory

I found the ring buffer pages are allocated in the node but the ring
buffer itself is not.  Let's convert it to use kzalloc_node() too.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 kernel/events/ring_buffer.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index ef91ae75ca56..bd55ccc91373 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -804,7 +804,7 @@ struct perf_buffer *rb_alloc(int nr_pages, long watermark, int cpu, int flags)
 {
 	struct perf_buffer *rb;
 	unsigned long size;
-	int i;
+	int i, node;
 
 	size = sizeof(struct perf_buffer);
 	size += nr_pages * sizeof(void *);
@@ -812,7 +812,8 @@ struct perf_buffer *rb_alloc(int nr_pages, long watermark, int cpu, int flags)
 	if (order_base_2(size) >= PAGE_SHIFT+MAX_ORDER)
 		goto fail;
 
-	rb = kzalloc(size, GFP_KERNEL);
+	node = (cpu == -1) ? cpu : cpu_to_node(cpu);
+	rb = kzalloc_node(size, GFP_KERNEL, node);
 	if (!rb)
 		goto fail;
 
@@ -906,11 +907,13 @@ struct perf_buffer *rb_alloc(int nr_pages, long watermark, int cpu, int flags)
 	struct perf_buffer *rb;
 	unsigned long size;
 	void *all_buf;
+	int node;
 
 	size = sizeof(struct perf_buffer);
 	size += sizeof(void *);
 
-	rb = kzalloc(size, GFP_KERNEL);
+	node = (cpu == -1) ? cpu : cpu_to_node(cpu);
+	rb = kzalloc_node(size, GFP_KERNEL, node);
 	if (!rb)
 		goto fail;
 
-- 
2.31.0.rc2.261.g7f71774620-goog