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From: Qi Zheng To: akpm@linux-foundation.org, david@fromorbit.com, tkhai@ya.ru, vbabka@suse.cz, roman.gushchin@linux.dev, djwong@kernel.org, brauner@kernel.org, paulmck@kernel.org, tytso@mit.edu Date: Thu, 22 Jun 2023 08:39:13 +0000 Message-Id: <20230622083932.4090339-11-qi.zheng@linux.dev> In-Reply-To: <20230622083932.4090339-1-qi.zheng@linux.dev> References: <20230622083932.4090339-1-qi.zheng@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 X-Mailman-Approved-At: Fri, 23 Jun 2023 05:25:40 +0000 Subject: [dm-devel] [PATCH 10/29] vmw_balloon: dynamically allocate the vmw-balloon shrinker X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-bcache@vger.kernel.org, linux-xfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-arm-msm@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org, linux-raid@vger.kernel.org, linux-mm@kvack.org, dm-devel@redhat.com, Qi Zheng , linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, freedreno@lists.freedesktop.org, linux-btrfs@vger.kernel.org Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: linux.dev From: Qi Zheng In preparation for implementing lockless slab shrink, we need to dynamically allocate the vmw-balloon shrinker, so that it can be freed asynchronously using kfree_rcu(). Then it doesn't need to wait for RCU read-side critical section when releasing the struct vmballoon. Signed-off-by: Qi Zheng --- drivers/misc/vmw_balloon.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index 9ce9b9e0e9b6..2f86f666b476 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -380,7 +380,7 @@ struct vmballoon { /** * @shrinker: shrinker interface that is used to avoid over-inflation. */ - struct shrinker shrinker; + struct shrinker *shrinker; /** * @shrinker_registered: whether the shrinker was registered. @@ -1569,7 +1569,7 @@ static unsigned long vmballoon_shrinker_count(struct shrinker *shrinker, static void vmballoon_unregister_shrinker(struct vmballoon *b) { if (b->shrinker_registered) - unregister_shrinker(&b->shrinker); + unregister_and_free_shrinker(b->shrinker); b->shrinker_registered = false; } @@ -1581,14 +1581,18 @@ static int vmballoon_register_shrinker(struct vmballoon *b) if (!vmwballoon_shrinker_enable) return 0; - b->shrinker.scan_objects = vmballoon_shrinker_scan; - b->shrinker.count_objects = vmballoon_shrinker_count; - b->shrinker.seeks = DEFAULT_SEEKS; + b->shrinker = shrinker_alloc_and_init(vmballoon_shrinker_count, + vmballoon_shrinker_scan, + 0, DEFAULT_SEEKS, 0, b); + if (!b->shrinker) + return -ENOMEM; - r = register_shrinker(&b->shrinker, "vmw-balloon"); + r = register_shrinker(b->shrinker, "vmw-balloon"); if (r == 0) b->shrinker_registered = true; + else + shrinker_free(b->shrinker); return r; }