From nobody Sat Oct 4 03:15:25 2025 Received: from mail-pf1-f195.google.com (mail-pf1-f195.google.com [209.85.210.195]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4F2FE2D6E53; Thu, 21 Aug 2025 09:06:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.195 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755767196; cv=none; b=jCpa5PpAlvuKqYtyzbiHIeXnN/ix4pOmn5GtU/uthWaXCYZ04jhD8g/6IsuPGSBGj30vbDLk6xTDfPidipji7LNEThmMskesTI5IsMk4pcDuhU5Huo2egqLO+A7jPPAE3lPcvQXYfrpGJYoHx1pEJAXJcrmj3+y0Dkdboh7jXcw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755767196; c=relaxed/simple; bh=bTIHaC7j+7J/bMwGU/BkRIOcDtOKJIMEeRQy/KliUC4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KLd5xaxcjxS7SfToPEa8Gp04UQmMgGsdRGVO4oaeoBnSI38yvEFXqKH8lrsnMKDFNlC7xO46c7hUPoSe7g/f/aqp7e+60jkmma4wLFkKOOGEGxKyINE6+QnCNUt96Td560tiqZUkbG1OkUk4FUkEiCSZcZL1aLWcbPgbmaL7si4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=dg8cLrXb; arc=none smtp.client-ip=209.85.210.195 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="dg8cLrXb" Received: by mail-pf1-f195.google.com with SMTP id d2e1a72fcca58-76e2ebe86ecso991800b3a.3; Thu, 21 Aug 2025 02:06:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1755767194; x=1756371994; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=XuCltBuqWN/DSCHw6nPVx35dtf5n5wtufyyXilS2WWQ=; b=dg8cLrXb88fj0GD0nLVyeZoh1ISA3k/YSAX8pigBKV9P5z072mKEkNIWlQsKwsxzh4 sd81YDEk0Zvy/UPrIC5S77noRdQeM37Xy2OnXECQNVqdzaJgzmaNy18qS1H6giBujD2Z OeL7piz4QwvHiRw2UUvK11cxooGG9NZiLAOFAOAvlZLdJ/Q+JsbhitqEv5foklpfmylY 5VodKGDCrmTZjewURCi9IX2GrCYA1HPuubTn9WdGcAeNCLV2lmwNCkPh2DP/gQpPaEEX mc3xTBdKSRqKfn/uPy4TkNdU8z9FWo7eKkuRDy726XebXI1xf6KFaYQAxf1FBDtfR9mP FR6g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755767194; x=1756371994; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=XuCltBuqWN/DSCHw6nPVx35dtf5n5wtufyyXilS2WWQ=; b=xDufCYeQczNX0YHkQ22AhRa10WkZ9hwTIXqZ9d+h0PoGee1EuQ40QRCsbquBD30ln7 3QQ+jasBTo8bOjW2XjzKexiuqIyfs2+xkxKrcZZ+vAjME6GojEBycgYxxWEOZsgPTtPF CEybN1p35Vg3hYX6AHPF8s8/+m8hl+aZbYv1ZUfBrD+qdSGyx7rwvBLuKznuwbEubNLQ +GYj5buKMO5Y9EFqoZaXZWBdeF17VN+DF4Tso2qUmDPPeTY+eB9mq572d6r0syTRsCtu Cx5Wwl7yGLFI/ympQ7ZPnSsx8WwKBfE3GJuPz3uotwUR6rIuBIQoCywfIAL2Yfg+AkJ5 lrMg== X-Forwarded-Encrypted: i=1; AJvYcCVjRRGpXpxaa7mHAv0SH46VcPVHj8YV2ONdqLwQMqpiawZylQizJXWiUZ5+Nh/6xhg9glo=@vger.kernel.org, AJvYcCVksyFx3wy/ZMCeNw9Q8QolEV+5WPN9V56pL43ais+mtZ98BplS9CxOLGIjMVeSoeUCcxzj@vger.kernel.org, AJvYcCX+ObHcdWrWeFjDrmFxWi5glyGEfAv55EgIMLAC6GvYQ1p6LKRBUNU6xOrDpkPwH+Qpy/LIgcfRwLQcdfzq@vger.kernel.org X-Gm-Message-State: AOJu0YzECJ7WcPHpc2SJjvsfpzebveq+4IQTH0pRpNc9no9+bbOkxA8L 742QnK3ZlrReOSGnSHne58+mkW6TepkY7wZhpq2wenVViAhFOLCjNrbf X-Gm-Gg: ASbGncvzfEDNPCjJcSyjWKXolXKczfHzIOTYo6C90abE2Gf5XmGxey4RzxmeivasqyG KakCMyIUn+P9wVMRnCvhb8Yu7j7xKSjdRZ3GDkbCOZz8LfbiHKuEeAxW2F5QMA+WH5KLs6nBt2b Tgju+d+jnO3og6yyCr3h40He34I9j6/WhK4IyAUqmmACKhIFn1nQEzYFFrgjm24gREWENr4Pc8p J/IbVzxtL4n0dXCIBjtmGZuFaMYoaGejnOLWwtQgiKw6w0N4wiQTB7OS9xYEA3nF4qx3gwYmfrY NvOpJSXDjPyL44Qr3Gi1lkTkcu25krC4lT85SSEqHAAXRphXIo0KabMjK8VVH/PYsN8z9LWBODr sb8HDanJ41MBKU4PUp6BEVFw= X-Google-Smtp-Source: AGHT+IEvGma+2JUsOCtxjSXnlbSq374x1K7erjquy/3NUbEf1gradL10rCdgT7ko5FE78MonWWLHBA== X-Received: by 2002:a05:6a00:928d:b0:769:93fb:210a with SMTP id d2e1a72fcca58-76ea324adfbmr2504056b3a.21.1755767194490; Thu, 21 Aug 2025 02:06:34 -0700 (PDT) Received: from 7940hx ([43.129.244.20]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-76ea0c16351sm1708937b3a.14.2025.08.21.02.06.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Aug 2025 02:06:34 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: ast@kernel.org, paulmck@kernel.org Cc: frederic@kernel.org, neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com, josh@joshtriplett.org, boqun.feng@gmail.com, urezki@gmail.com, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, qiang.zhang@linux.dev, daniel@iogearbox.net, john.fastabend@gmail.com, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, rcu@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH bpf-next v3 2/7] bpf: use rcu_read_lock_dont_migrate() for bpf_cgrp_storage_free() Date: Thu, 21 Aug 2025 17:06:04 +0800 Message-ID: <20250821090609.42508-3-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250821090609.42508-1-dongml2@chinatelecom.cn> References: <20250821090609.42508-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use rcu_read_lock_dont_migrate() and rcu_read_unlock_migrate() in bpf_cgrp_storage_free to obtain better performance when PREEMPT_RCU is not enabled. Signed-off-by: Menglong Dong --- v2: - use rcu_read_lock_dont_migrate() instead of rcu_migrate_disable() --- kernel/bpf/bpf_cgrp_storage.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/kernel/bpf/bpf_cgrp_storage.c b/kernel/bpf/bpf_cgrp_storage.c index 148da8f7ff36..0687a760974a 100644 --- a/kernel/bpf/bpf_cgrp_storage.c +++ b/kernel/bpf/bpf_cgrp_storage.c @@ -45,8 +45,7 @@ void bpf_cgrp_storage_free(struct cgroup *cgroup) { struct bpf_local_storage *local_storage; =20 - migrate_disable(); - rcu_read_lock(); + rcu_read_lock_dont_migrate(); local_storage =3D rcu_dereference(cgroup->bpf_cgrp_storage); if (!local_storage) goto out; @@ -55,8 +54,7 @@ void bpf_cgrp_storage_free(struct cgroup *cgroup) bpf_local_storage_destroy(local_storage); bpf_cgrp_storage_unlock(); out: - rcu_read_unlock(); - migrate_enable(); + rcu_read_unlock_migrate(); } =20 static struct bpf_local_storage_data * --=20 2.50.1