From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9F7F84A3F1F; Mon, 31 Aug 2026 18:22:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788200533; cv=none; b=QVAHFyQNlVMjQuTeLQxI5CQZtukG/D978pimCGgaD5O55bEbhXOB372o+cLBM6GHj8Tn4T7i187FDhgr3jfZbvcNWvJz7c++iZlIqcQp9k9ZkvoNvBUgrssfKfBSKPDv9Ko+Kncny+V7sWm22ozcyFxtWdrdmsssxCy7puZyM2Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788200533; c=relaxed/simple; bh=tSL0uX5WiMXqa9KcVZAW5G1vvE7oLcVy4eyodGJqHX8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=OAl+8HxQ9O91lySoFyVgSsMXYaohhb1VxCDeQqmYTGCAU7ZannmkcIv9MrxgjAzQ7qLxFUUq43R66r1Kmq4WyHdc4yfNCE7+spHUe8HVTOnCXMErjpx9fsz5Sa+d6LLVouS75cjl3BY7rWCmcqxN+eyHSCPlENaYhFisvhWyyO4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PDP0n0BO; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PDP0n0BO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 00D841F00A3F; Mon, 31 Aug 2026 18:22:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788200531; bh=/8h3ZyhxcBc9+MXGp+kCBkAD/N+CQiquY4vElNXs4Sg=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=PDP0n0BOsT6lp9ONvnDCVMuRExMSo0EBlKmp20JVBFHkv88FsWgYGbJKQxf7x9aFC +kRlRxpSuTFoko0U8RdID4TPDQmWTA9HAl/F4/SipEKnwy0FEwrOwE6RuCjfzQtd0X jLVFnaHrKOjuCtR3utQYUckZaq0Q6rBGuW2MfLji3Pu0GszXWXvvUO0fyemCZm5fsz srumqCGSAqAq+ncYheOAg1G1TDA1FOR76phj9tLwOF9GQtniY9mRSaC4D4d4Cs5yVP a58kdqXIoTB2AIRVAELuTbV5P5hvwZZ2pA+yqwdwGFS5Vc/oeUvTN8cdNeIu+Kypiz ygCaKPW9CL+vg== From: Chuck Lever Date: Mon, 31 Aug 2026 14:22:00 -0400 Subject: [PATCH RFC 4/8] Set WQ_SYSFS on key NFS-related workqueues Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260831-performance-v1-4-8d9fd9b67f96@kernel.org> References: <20260831-performance-v1-0-8d9fd9b67f96@kernel.org> In-Reply-To: <20260831-performance-v1-0-8d9fd9b67f96@kernel.org> To: Trond Myklebust , Anna Schumaker , Tejun Heo Cc: Lai Jiangshan , linux-nfs@vger.kernel.org, open list , Chuck Lever X-Mailer: b4 0.16-dev-da966 X-Developer-Signature: v=1; a=openpgp-sha256; l=1677; i=cel@kernel.org; h=from:subject:message-id; bh=tSL0uX5WiMXqa9KcVZAW5G1vvE7oLcVy4eyodGJqHX8=; b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBqlcZPUk2WAUnwrhHYs0lkjHwtVJSUin5p4QXyZ MaVjHYBURaJAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCapXGTwAKCRAzarMzb2Z/ lwvSD/43BvorEcNglmPSncbfa79si+LpJ1OF+6XfuUqJPkfMTRojinLnugM/ePaOe79BYOuFWxW lhkzXwT2ve74Geue08TTZzLrCUAv0tCFcTXkrhgeT4DlZ0PywZr5r9D2pwbf4aObU+pRi3n2GRa YBRfDGWYPYrlONUEawGaAV6/Yz245zfkJniSPpVhmxitM08hWptoPUjea6X7pjqa2XFzoCPSfOw 5qY0lmVo7AApzNKNlJfK60vwML5bT8jQgVgBJCXuvNVsnVH+1Sv1lM9axjr2rKSTTWywyheQyeX cujnGIJKj0Me8ONzoX5OzPJyQB7JobD2/Y0cEAqIFgIOMljtu9WEbBHok2oT9v8kwUW/EXXFAX8 6OSiS+WgyS+wtIaL308rchVKvS17Gyu/QGpTRYXsQnefJ++vUwWdBgL6zlLSYi/uIZckhtGzgga U3R1OMXfl0LR0jXUe+Zf8KEaHPBE2BM9VF8gq0PGZPHi1t+Q8tqp5WXMuLO8YMHJmNIomV1ZQ1F Mkn74NDi+2G2MWfAki3x1e85DzzT6UoLkFEhk5deXQmoSjjYSLW/5ZiBzBn9bC+v6p83Mob2YcI 5AZBz1frnfU+5GJAUf0WzRcf/n5g+rL/2dAiu0d11t+rAVoIkv9Z5ZYHXY2dSXYYYQzRZ++H4dS 6l4B9XBz3VrkKBw== X-Developer-Key: i=cel@kernel.org; a=openpgp; fpr=28B2E5B01286DF243CF23EFE336AB3336F667F97 WQ_SYSFS exposes settable workqueue attributes under /sys/devices/virtual/workqueue/. For NFS workloads, this is useful for tuning affinity scope at runtime without reloading modules. Signed-off-by: Chuck Lever --- fs/nfs/inode.c | 3 ++- net/sunrpc/sched.c | 5 +++-- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index 3022454f7698..107a2135029d 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -2619,7 +2619,8 @@ static void nfsiod_stop(void) static int nfsiod_start(void) { dprintk("RPC: creating workqueue nfsiod\n"); - nfsiod_workqueue = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0); + nfsiod_workqueue = alloc_workqueue("nfsiod", + WQ_MEM_RECLAIM | WQ_UNBOUND | WQ_SYSFS, 0); if (nfsiod_workqueue == NULL) return -ENOMEM; #if IS_ENABLED(CONFIG_NFS_LOCALIO) diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 9b2800f6bfc7..c31cf55b933f 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -1271,16 +1271,17 @@ void rpciod_down(void) */ static int rpciod_start(void) { + const unsigned int wq_flags = WQ_MEM_RECLAIM | WQ_UNBOUND | WQ_SYSFS; struct workqueue_struct *wq; /* * Create the rpciod thread and wait for it to start. */ - wq = alloc_workqueue("rpciod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0); + wq = alloc_workqueue("rpciod", wq_flags, 0); if (!wq) goto out_failed; rpciod_workqueue = wq; - wq = alloc_workqueue("xprtiod", WQ_UNBOUND | WQ_MEM_RECLAIM, 0); + wq = alloc_workqueue("xprtiod", wq_flags, 0); if (!wq) goto free_rpciod; xprtiod_workqueue = wq; -- 2.55.0