From nobody Sat Oct 4 03:15:24 2025 Received: from mail-pf1-f193.google.com (mail-pf1-f193.google.com [209.85.210.193]) (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 B5AFA2D3743; Thu, 21 Aug 2025 09:06:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.193 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755767210; cv=none; b=Bmvanx0boGZQ/T3hJTmO+ddevgXhwAwZOKSn2nDplRMljKkiQiyPKesGFh26AeqkKvykrpYyDmjRrEoHwhIMc+rsFyPglkG6HiFE//XaZ0aeHQRqWLk55czJ1YGY5cXMZA2Z3B9rtc9cE78rBlS48H3qfMnhgJXTlsMRdZOzfAs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755767210; c=relaxed/simple; bh=eqO46c3pAN3PfhGNOqY8l83f0ewMbPj8kQ9DK6CPRUU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Z32dPQvA2z2922eAxX7MgduoICS8j6QEPsQh/k8S/vBY3mo2trMs5YPQDVKWi75o93sLYfMcAZZdRhKUPhCFbNV7tRhD+KwICp4ICOBYrUgSjmbTxKpBV0XVAInNTSvlBOqB1Ygf6lmcPFnIXNC02mNOiq2lrcYvrvf+KlXlU8A= 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=EQokETEg; arc=none smtp.client-ip=209.85.210.193 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="EQokETEg" Received: by mail-pf1-f193.google.com with SMTP id d2e1a72fcca58-76e2ebe86ecso992122b3a.3; Thu, 21 Aug 2025 02:06:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1755767208; x=1756372008; 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=861OdxVnWv8IWFvxkcYe5tkgp3QAasS1lAYJfLFgMx4=; b=EQokETEg+O4W+MHbMDIvL+HCMw2eNf/XnJphfRNDMCNhvRCG75l86FgHhYdI2H8jG7 FuCiDIL3UoSsGH4UpQ7jREBZCHuamNYST2DP4oJhI1JqrYdKifEwGrMb8nlDWRqytDo0 D2yn3rfwzWQhSMfc0xqWsGU0+NtBpJr/tMO579srAh9uofFW4JISedVFh9mAb8m2znJM JUb6yHdHrOyzxC9bKm20a5CpBGITUuM5iyArFkNIDoY2xcQk08MkZtYeJCRJ9Kr+GJkf C/kF8vZ4TQ9w42Rcm4Ly2mfXKuGYsrFOHWLBNDB/OUc8OKuV8g3IB/Lz/kBpY0ue6gjV yetQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755767208; x=1756372008; 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=861OdxVnWv8IWFvxkcYe5tkgp3QAasS1lAYJfLFgMx4=; b=uqj3OboPvgUriaTThGg1pbIXKMSxsnRyf8Ppmf5TDOIQeTLtjCyWaCr62hopqAovdZ GrVTUfTZHbd9d8WXgH1H0+8I2+kzpJimwOnRCwcMaixogBqY/5+9yOTN81k0tnODVpya 9SdDCK0lll/w+wjTI5p6f0UZlGhfmY0b9dTRnZ44FqFprDv1ohTnH9fBPfBiEtyzNex+ qVaaZKa6t1rWu/bIYhhl0Y0L+EUoPALdhKCtNM8mfGKuLVo6uhMbQ77sSwU4G94pQnWh V58YDbLLYym2eESKEH9/QQWlZ9xlj6a6WmYKA33937xcEjQRItftkUAa88QRhiY4vXqR hPwQ== X-Forwarded-Encrypted: i=1; AJvYcCVuaLAiwaP/O4eAGxEjiFw/xTify3RMcSWQip7fQq7oKSaZO7UWenDQvjJVZ6w6U01PzPdG@vger.kernel.org, AJvYcCWCNcLLuKOjxW/RS9fpmWZAjY1EoxYKieeaNhaOBY9831suk3v0RfeAe34mSm2to4HqgJFKW7fQXR5hOYdK@vger.kernel.org, AJvYcCWnc1if8N+VSThDWnG7pxLNC1gprH2ImwkQ3iPdZLTt5Z7UaAa3ZhcKsq7oHr5Pgu18H7c=@vger.kernel.org X-Gm-Message-State: AOJu0YwIA4TColM9R8MbQ08nWMp5M7X20BlnIFWahc40DiwtOXRD9sls oeU4a1XKuKlwu8Dw3JyH3diIJnMnqEuXvds2HgVB2SY2mKfEEJMVqjfx X-Gm-Gg: ASbGncs79xzwrmP6ZoVOaU1+ctma+6YwHC44kXL82AYlJIakLK5EaZz2atLz/O8lbjP BR0IhLJHQnV5IbuQcT7pSwUpfYyembgtp6+wbQ8WWxnl2YXqARM11isdEb+hA59pOBtCRCnEmsw Bzsio/aEqq0P6Cv3o0/BlwP1nNfXX9soljKgaSJCBTCrZch3kp1/i2I6L7Kqg/dIHyij8x9m9PS r0SOJP94pNgU1Vqrc/pUh47OvgEkID+4FRQnhHqvRmVz7fc8eKeb3Q/jU3ANOjLqqYWpE2Y/OSS DmTInLf9TPrOHnlsLAmiib0mKudKLna/ASBhGY18qlpfeN4fQVnsiaYjV2pV4FyJKjTJuDAGUVn pIjFZBvjIkH/kTccxBevS8dpJCysxH78iiA== X-Google-Smtp-Source: AGHT+IHbFHBs2bkiQYDlXGS3VRmYlPSUwRBoe4kn5EMWdgE3xPMdKnwf0IZRHj5qQa2vZc81N7rGDg== X-Received: by 2002:a05:6a20:5483:b0:240:1ad8:17f1 with SMTP id adf61e73a8af0-243308364bcmr2503050637.21.1755767208009; Thu, 21 Aug 2025 02:06:48 -0700 (PDT) Received: from 7940hx ([43.129.244.20]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-76ea0c16351sm1708937b3a.14.2025.08.21.02.06.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Aug 2025 02:06:47 -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 4/7] bpf: use rcu_read_lock_dont_migrate() for bpf_iter_run_prog() Date: Thu, 21 Aug 2025 17:06:06 +0800 Message-ID: <20250821090609.42508-5-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_iter_run_prog 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_iter.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/kernel/bpf/bpf_iter.c b/kernel/bpf/bpf_iter.c index 0cbcae727079..6ac35430c573 100644 --- a/kernel/bpf/bpf_iter.c +++ b/kernel/bpf/bpf_iter.c @@ -705,13 +705,11 @@ int bpf_iter_run_prog(struct bpf_prog *prog, void *ct= x) migrate_enable(); rcu_read_unlock_trace(); } else { - rcu_read_lock(); - migrate_disable(); + rcu_read_lock_dont_migrate(); old_run_ctx =3D bpf_set_run_ctx(&run_ctx); ret =3D bpf_prog_run(prog, ctx); bpf_reset_run_ctx(old_run_ctx); - migrate_enable(); - rcu_read_unlock(); + rcu_read_unlock_migrate(); } =20 /* bpf program can only return 0 or 1: --=20 2.50.1