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

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On 2023/7/24 17:43, Qi Zheng wrote:
Use new APIs to dynamically allocate the thp-zero and thp-deferred_split
shrinkers.

Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
---
  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;

Same as patch #17.

#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)

Better to declare it as __init.

+{
+	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)

Same as here.

+{
+	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)
  {

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