linux-ext4 - [PATCH v4 19/48] rcu: dynamically allocate the rcu-kfree shrinker

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Date:   Mon,  7 Aug 2023 19:09:07 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     akpm@...ux-foundation.org, david@...morbit.com, tkhai@...ru,
        vbabka@...e.cz, roman.gushchin@...ux.dev, djwong@...nel.org,
        brauner@...nel.org, paulmck@...nel.org, tytso@....edu,
        steven.price@....com, cel@...nel.org, senozhatsky@...omium.org,
        yujie.liu@...el.com, gregkh@...uxfoundation.org,
        muchun.song@...ux.dev, simon.horman@...igine.com,
        dlemoal@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
        kvm@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-erofs@...ts.ozlabs.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-nfs@...r.kernel.org, linux-mtd@...ts.infradead.org,
        rcu@...r.kernel.org, netdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        dm-devel@...hat.com, linux-raid@...r.kernel.org,
        linux-bcache@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-btrfs@...r.kernel.org,
        Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH v4 19/48] rcu: dynamically allocate the rcu-kfree shrinker

Use new APIs to dynamically allocate the rcu-kfree shrinker.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
 kernel/rcu/tree.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 7c79480bfaa0..3b20fc46c514 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3449,13 +3449,6 @@ kfree_rcu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
 	return freed == 0 ? SHRINK_STOP : freed;
 }
 
-static struct shrinker kfree_rcu_shrinker = {
-	.count_objects = kfree_rcu_shrink_count,
-	.scan_objects = kfree_rcu_shrink_scan,
-	.batch = 0,
-	.seeks = DEFAULT_SEEKS,
-};
-
 void __init kfree_rcu_scheduler_running(void)
 {
 	int cpu;
@@ -4931,6 +4924,7 @@ static void __init kfree_rcu_batch_init(void)
 {
 	int cpu;
 	int i, j;
+	struct shrinker *kfree_rcu_shrinker;
 
 	/* Clamp it to [0:100] seconds interval. */
 	if (rcu_delay_page_cache_fill_msec < 0 ||
@@ -4962,8 +4956,18 @@ static void __init kfree_rcu_batch_init(void)
 		INIT_DELAYED_WORK(&krcp->page_cache_work, fill_page_cache_func);
 		krcp->initialized = true;
 	}
-	if (register_shrinker(&kfree_rcu_shrinker, "rcu-kfree"))
-		pr_err("Failed to register kfree_rcu() shrinker!\n");
+
+	kfree_rcu_shrinker = shrinker_alloc(0, "rcu-kfree");
+	if (!kfree_rcu_shrinker) {
+		pr_err("Failed to allocate kfree_rcu() shrinker!\n");
+		return;
+	}
+
+	kfree_rcu_shrinker->count_objects = kfree_rcu_shrink_count;
+	kfree_rcu_shrinker->scan_objects = kfree_rcu_shrink_scan;
+	kfree_rcu_shrinker->seeks = DEFAULT_SEEKS;
+
+	shrinker_register(kfree_rcu_shrinker);
 }
 
 void __init rcu_init(void)
-- 
2.30.2