From ff65338e78418e5970a7aabbabb94c46f2bb821d Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung@kernel.org>
Date: Thu, 11 Mar 2021 20:54:13 +0900
Subject: [PATCH] perf core: Allocate perf_event in the target node memory
For cpu events, it'd better allocating them in the corresponding node
memory as they would be mostly accessed by the target cpu. Although
perf tools sets the cpu affinity before calling perf_event_open, there
are places it doesn't (notably perf record) and we should consider
other external users too.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210311115413.444407-2-namhyung@kernel.org
---
kernel/events/core.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index f526ddb50d5e05..6182cb199f7247 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -11288,13 +11288,16 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
struct perf_event *event;
struct hw_perf_event *hwc;
long err = -EINVAL;
+ int node;
if ((unsigned)cpu >= nr_cpu_ids) {
if (!task || cpu != -1)
return ERR_PTR(-EINVAL);
}
- event = kmem_cache_zalloc(perf_event_cache, GFP_KERNEL);
+ node = (cpu >= 0) ? cpu_to_node(cpu) : -1;
+ event = kmem_cache_alloc_node(perf_event_cache, GFP_KERNEL | __GFP_ZERO,
+ node);
if (!event)
return ERR_PTR(-ENOMEM);
--
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