linux-kernel - [PATCH v2 19/47] mm: thp: dynamically allocate the thp-related shrinkers

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Message-Id: <20230724094354.90817-20-zhengqi.arch@bytedance.com>
Date:   Mon, 24 Jul 2023 17:43:26 +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
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 v2 19/47] mm: thp: dynamically allocate the thp-related shrinkers

Use new APIs to dynamically allocate the thp-zero and thp-deferred_split
shrinkers.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
 mm/huge_memory.c | 69 +++++++++++++++++++++++++++++++-----------------
 1 file changed, 45 insertions(+), 24 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 8c94b34024a2..4db5a1834d81 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -65,7 +65,11 @@ unsigned long transparent_hugepage_flags __read_mostly =
 	(1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG)|
 	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG);
 
-static struct shrinker deferred_split_shrinker;
+static struct shrinker *deferred_split_shrinker;
+static unsigned long deferred_split_count(struct shrinker *shrink,
+					  struct shrink_control *sc);
+static unsigned long deferred_split_scan(struct shrinker *shrink,
+					 struct shrink_control *sc);
 
 static atomic_t huge_zero_refcount;
 struct page *huge_zero_page __read_mostly;
@@ -229,11 +233,7 @@ static unsigned long shrink_huge_zero_page_scan(struct shrinker *shrink,
 	return 0;
 }
 
-static struct shrinker huge_zero_page_shrinker = {
-	.count_objects = shrink_huge_zero_page_count,
-	.scan_objects = shrink_huge_zero_page_scan,
-	.seeks = DEFAULT_SEEKS,
-};
+static struct shrinker *huge_zero_page_shrinker;
 
 #ifdef CONFIG_SYSFS
 static ssize_t enabled_show(struct kobject *kobj,
@@ -454,6 +454,40 @@ static inline void hugepage_exit_sysfs(struct kobject *hugepage_kobj)
 }
 #endif /* CONFIG_SYSFS */
 
+static int thp_shrinker_init(void)
+{
+	huge_zero_page_shrinker = shrinker_alloc(0, "thp-zero");
+	if (!huge_zero_page_shrinker)
+		return -ENOMEM;
+
+	deferred_split_shrinker = shrinker_alloc(SHRINKER_NUMA_AWARE |
+						 SHRINKER_MEMCG_AWARE |
+						 SHRINKER_NONSLAB,
+						 "thp-deferred_split");
+	if (!deferred_split_shrinker) {
+		shrinker_free_non_registered(huge_zero_page_shrinker);
+		return -ENOMEM;
+	}
+
+	huge_zero_page_shrinker->count_objects = shrink_huge_zero_page_count;
+	huge_zero_page_shrinker->scan_objects = shrink_huge_zero_page_scan;
+	huge_zero_page_shrinker->seeks = DEFAULT_SEEKS;
+	shrinker_register(huge_zero_page_shrinker);
+
+	deferred_split_shrinker->count_objects = deferred_split_count;
+	deferred_split_shrinker->scan_objects = deferred_split_scan;
+	deferred_split_shrinker->seeks = DEFAULT_SEEKS;
+	shrinker_register(deferred_split_shrinker);
+
+	return 0;
+}
+
+static void thp_shrinker_exit(void)
+{
+	shrinker_unregister(huge_zero_page_shrinker);
+	shrinker_unregister(deferred_split_shrinker);
+}
+
 static int __init hugepage_init(void)
 {
 	int err;
@@ -482,12 +516,9 @@ static int __init hugepage_init(void)
 	if (err)
 		goto err_slab;
 
-	err = register_shrinker(&huge_zero_page_shrinker, "thp-zero");
-	if (err)
-		goto err_hzp_shrinker;
-	err = register_shrinker(&deferred_split_shrinker, "thp-deferred_split");
+	err = thp_shrinker_init();
 	if (err)
-		goto err_split_shrinker;
+		goto err_shrinker;
 
 	/*
 	 * By default disable transparent hugepages on smaller systems,
@@ -505,10 +536,8 @@ static int __init hugepage_init(void)
 
 	return 0;
 err_khugepaged:
-	unregister_shrinker(&deferred_split_shrinker);
-err_split_shrinker:
-	unregister_shrinker(&huge_zero_page_shrinker);
-err_hzp_shrinker:
+	thp_shrinker_exit();
+err_shrinker:
 	khugepaged_destroy();
 err_slab:
 	hugepage_exit_sysfs(hugepage_kobj);
@@ -2851,7 +2880,7 @@ void deferred_split_folio(struct folio *folio)
 #ifdef CONFIG_MEMCG
 		if (memcg)
 			set_shrinker_bit(memcg, folio_nid(folio),
-					 deferred_split_shrinker.id);
+					 deferred_split_shrinker->id);
 #endif
 	}
 	spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags);
@@ -2925,14 +2954,6 @@ static unsigned long deferred_split_scan(struct shrinker *shrink,
 	return split;
 }
 
-static struct shrinker deferred_split_shrinker = {
-	.count_objects = deferred_split_count,
-	.scan_objects = deferred_split_scan,
-	.seeks = DEFAULT_SEEKS,
-	.flags = SHRINKER_NUMA_AWARE | SHRINKER_MEMCG_AWARE |
-		 SHRINKER_NONSLAB,
-};
-
 #ifdef CONFIG_DEBUG_FS
 static void split_huge_pages_all(void)
 {
-- 
2.30.2