From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> Subject: 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. Link: https://lkml.kernel.org/r/20210923164741.1859522-4-bigeasy@xxxxxxxxxxxxx Link: https://lore.kernel.org/r/20210830172627.267989-4-bigeasy@xxxxxxxxxxxxx Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> Acked-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Acked-by: Marco Elver <elver@xxxxxxxxxx> Tested-by: Marco Elver <elver@xxxxxxxxxx> Reviewed-by: Andrey Konovalov <andreyknvl@xxxxxxxxx> Cc: Clark Williams <williams@xxxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- kernel/kcov.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/kernel/kcov.c~kcov-allocate-per-cpu-memory-on-the-relevant-node +++ a/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; _
