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[217.30.74.39]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-615226558d3sm2730656a12.45.2025.07.28.13.31.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 28 Jul 2025 13:31:28 -0700 (PDT) From: Andrey Albershteyn X-Google-Original-From: Andrey Albershteyn Date: Mon, 28 Jul 2025 22:30:12 +0200 Subject: [PATCH RFC 08/29] ext4: use a per-superblock fsverity workqueue Precedence: bulk X-Mailing-List: fsverity@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250728-fsverity-v1-8-9e5443af0e34@kernel.org> References: <20250728-fsverity-v1-0-9e5443af0e34@kernel.org> In-Reply-To: <20250728-fsverity-v1-0-9e5443af0e34@kernel.org> To: fsverity@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, david@fromorbit.com, djwong@kernel.org, ebiggers@kernel.org, hch@lst.de X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1033; i=aalbersh@kernel.org; h=from:subject:message-id; bh=8eioOXLwKFbWQjOAzR05yR6o85tqQ9fD9/ewRMN73qY=; b=owJ4nJvAy8zAJea2/JXEGuOHHIyn1ZIYMtrviStxfr8V+zzu88HeFq/NhRLCl9kXnNFsPcB6e /qJDIHzVtkdpSwMYlwMsmKKLOuktaYmFUnlHzGokYeZw8oEMoSBi1MAJmL/guF/6StJt4ZHu6Un uucKypWZSByuXP24xklOeHFOkcuX5k+VDP+07MNvHDm/Yo/UfNu9K/zj3jfwikiapM5v9Wv/+qO iei8/AGH0SCI= X-Developer-Key: i=aalbersh@kernel.org; a=openpgp; fpr=AE1B2A9562721A6FC4307C1F46A7EA18AC33E108 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 9eKl8QFLYhEBPlscRHdKuBoZ9mg6WbOS1GD3jgLTsRU_1753734689 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "Darrick J. Wong" Switch ext4 to use a per-sb fsverity workqueue instead of a systemwide workqueue. Signed-off-by: Darrick J. Wong --- fs/ext4/super.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index c7d39da7e733..dcb9d1933c2e 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -5373,6 +5373,17 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb) #endif #ifdef CONFIG_FS_VERITY sb->s_vop = &ext4_verityops; + /* + * Use a high-priority workqueue to prioritize verification work, which + * blocks reads from completing, over regular application tasks. + * + * For performance reasons, don't use an unbound workqueue. Using an + * unbound workqueue for crypto operations causes excessive scheduler + * latency on ARM64. + */ + err = fsverity_init_wq(sb, WQ_HIGHPRI, num_online_cpus()); + if (err) + goto failed_mount3a; #endif #ifdef CONFIG_QUOTA sb->dq_op = &ext4_quota_operations; -- 2.50.0