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Message-Id: <20230601132714.2540707-1-qi.zheng@linux.dev>
Date: Thu, 1 Jun 2023 13:27:14 +0000
From: Qi Zheng <qi.zheng@...ux.dev>
To: akpm@...ux-foundation.org, roman.gushchin@...ux.dev
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH RESEND] mm: vmscan: move shrinker_debugfs_remove() before synchronize_srcu()
From: Qi Zheng <zhengqi.arch@...edance.com>
The debugfs_remove_recursive() will wait for debugfs_file_put()
to return, so there is no need to put it after synchronize_srcu()
to wait for the rcu read-side critical section to exit.
Just move it before synchronize_srcu(), which is also convenient
to put the heavy synchronize_srcu() in the delayed work later.
Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
Resend as an independent patch.
mm/vmscan.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index eeca83e28c9b..a773e97e152e 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -818,11 +818,11 @@ void unregister_shrinker(struct shrinker *shrinker)
debugfs_entry = shrinker_debugfs_detach(shrinker, &debugfs_id);
mutex_unlock(&shrinker_mutex);
+ shrinker_debugfs_remove(debugfs_entry, debugfs_id);
+
atomic_inc(&shrinker_srcu_generation);
synchronize_srcu(&shrinker_srcu);
- shrinker_debugfs_remove(debugfs_entry, debugfs_id);
-
kfree(shrinker->nr_deferred);
shrinker->nr_deferred = NULL;
}
--
2.30.2
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