linux-kernel - [PATCH v2 3/5] kcov: Allocate per-CPU memory on the relevant node.

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Date:   Thu, 23 Sep 2021 18:47:39 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Marco Elver <elver@...gle.com>,
        Clark Williams <williams@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH v2 3/5] kcov: Allocate per-CPU memory on the relevant node.

During boot kcov allocates per-CPU memory which is used later if remote/
softirq processing is enabled.

Allocate the per-CPU memory on the CPU local node to avoid cross node
memory access.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Acked-by: Dmitry Vyukov <dvyukov@...gle.com>
Acked-by: Marco Elver <elver@...gle.com>
Tested-by: Marco Elver <elver@...gle.com>
Link: https://lore.kernel.org/r/20210830172627.267989-4-bigeasy@linutronix.de
---
 kernel/kcov.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/kcov.c b/kernel/kcov.c
index 80bfe71bbe13e..4f910231d99a2 100644
--- a/kernel/kcov.c
+++ b/kernel/kcov.c
@@ -1034,8 +1034,8 @@ static int __init kcov_init(void)
 	int cpu;
 
 	for_each_possible_cpu(cpu) {
-		void *area = vmalloc(CONFIG_KCOV_IRQ_AREA_SIZE *
-				sizeof(unsigned long));
+		void *area = vmalloc_node(CONFIG_KCOV_IRQ_AREA_SIZE *
+				sizeof(unsigned long), cpu_to_node(cpu));
 		if (!area)
 			return -ENOMEM;
 		per_cpu_ptr(&kcov_percpu_data, cpu)->irq_area = area;
-- 
2.33.0