From 8934afb98ea98537cc7a1f90bf0285e47f37739f Mon Sep 17 00:00:00 2001
From: Yu Kuai <yukuai3@huawei.com>
Date: Sun, 9 Oct 2022 09:05:39 +0000
Subject: [PATCH] md: enable dispatching bio asynchronously for raid10 by
default
hulk inclusion
category: performance
bugzilla: 187597, https://gitee.com/openeuler/kernel/issues/I5QK5M
CVE: NA
--------------------------------
Try to improve performance for raid when user issues io concurrently
from multiple nodes.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>
---
drivers/md/md.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 9c94190769b8..ac2bdb4665b8 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -66,6 +66,7 @@
#include <linux/raid/md_u.h>
#include <linux/slab.h>
#include <linux/percpu-refcount.h>
+#include <linux/arch_topology.h>
#include <trace/events/block.h>
#include "md.h"
@@ -5543,6 +5544,16 @@ static void md_safemode_timeout(struct timer_list *t)
static int start_dirty_degraded;
+#define MIN_DISPATCH_ASYNC_CPUS 16
+static void queue_init_dispatch_async_cpus(struct request_queue *q, int node)
+{
+ arch_get_preferred_sibling_cpumask(node, &q->dispatch_async_cpus);
+ if (cpumask_weight(&q->dispatch_async_cpus) >= MIN_DISPATCH_ASYNC_CPUS)
+ blk_queue_flag_set(QUEUE_FLAG_DISPATCH_ASYNC, q);
+ else
+ cpumask_setall(&q->dispatch_async_cpus);
+}
+
int md_run(struct mddev *mddev)
{
int err;
@@ -5786,6 +5797,8 @@ int md_run(struct mddev *mddev)
if (mddev->sb_flags)
md_update_sb(mddev, 0);
+ if (mddev->queue && pers->level == 10)
+ queue_init_dispatch_async_cpus(mddev->queue, 1);
md_new_event(mddev);
return 0;
--
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