Re: [PATCH v2 11/47] gfs2: dynamically allocate the gfs2-qd shrinker

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On 2023/7/26 14:49, Muchun Song wrote:


On 2023/7/24 17:43, Qi Zheng wrote:
Use new APIs to dynamically allocate the gfs2-qd shrinker.

Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
---
  fs/gfs2/main.c  |  6 +++---
  fs/gfs2/quota.c | 26 ++++++++++++++++++++------
  fs/gfs2/quota.h |  3 ++-
  3 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
index afcb32854f14..e47b1cc79f59 100644
--- a/fs/gfs2/main.c
+++ b/fs/gfs2/main.c
@@ -147,7 +147,7 @@ static int __init init_gfs2_fs(void)
      if (!gfs2_trans_cachep)
          goto fail_cachep8;
-    error = register_shrinker(&gfs2_qd_shrinker, "gfs2-qd");
+    error = gfs2_qd_shrinker_init();
      if (error)
          goto fail_shrinker;
@@ -196,7 +196,7 @@ static int __init init_gfs2_fs(void)
  fail_wq2:
      destroy_workqueue(gfs_recovery_wq);
  fail_wq1:
-    unregister_shrinker(&gfs2_qd_shrinker);
+    gfs2_qd_shrinker_exit();
  fail_shrinker:
      kmem_cache_destroy(gfs2_trans_cachep);
  fail_cachep8:
@@ -229,7 +229,7 @@ static int __init init_gfs2_fs(void)
  static void __exit exit_gfs2_fs(void)
  {
-    unregister_shrinker(&gfs2_qd_shrinker);
+    gfs2_qd_shrinker_exit();
      gfs2_glock_exit();
      gfs2_unregister_debugfs();
      unregister_filesystem(&gfs2_fs_type);
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 704192b73605..bc9883cea847 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -186,13 +186,27 @@ static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
      return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
  }
-struct shrinker gfs2_qd_shrinker = {
-    .count_objects = gfs2_qd_shrink_count,
-    .scan_objects = gfs2_qd_shrink_scan,
-    .seeks = DEFAULT_SEEKS,
-    .flags = SHRINKER_NUMA_AWARE,
-};
+static struct shrinker *gfs2_qd_shrinker;
+
+int gfs2_qd_shrinker_init(void)

It's better to declare this as __init.

OK, Will do.


+{
+    gfs2_qd_shrinker = shrinker_alloc(SHRINKER_NUMA_AWARE, "gfs2-qd");
+    if (!gfs2_qd_shrinker)
+        return -ENOMEM;
+
+    gfs2_qd_shrinker->count_objects = gfs2_qd_shrink_count;
+    gfs2_qd_shrinker->scan_objects = gfs2_qd_shrink_scan;
+    gfs2_qd_shrinker->seeks = DEFAULT_SEEKS;
+
+    shrinker_register(gfs2_qd_shrinker);
+    return 0;
+}
+
+void gfs2_qd_shrinker_exit(void)
+{
+    shrinker_unregister(gfs2_qd_shrinker);
+}
  static u64 qd2index(struct gfs2_quota_data *qd)
  {
diff --git a/fs/gfs2/quota.h b/fs/gfs2/quota.h
index 21ada332d555..f9cb863373f7 100644
--- a/fs/gfs2/quota.h
+++ b/fs/gfs2/quota.h
@@ -59,7 +59,8 @@ static inline int gfs2_quota_lock_check(struct gfs2_inode *ip,
  }
  extern const struct quotactl_ops gfs2_quotactl_ops;
-extern struct shrinker gfs2_qd_shrinker;
+int gfs2_qd_shrinker_init(void);
+void gfs2_qd_shrinker_exit(void);
  extern struct list_lru gfs2_qd_lru;
  extern void __init gfs2_quota_hash_init(void);


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