From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f180.google.com (mail-pl1-f180.google.com [209.85.214.180]) (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 C564417993 for ; Thu, 23 Jan 2025 19:15:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.180 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737659720; cv=none; b=ZMNorAZsXOfdOulPAfpd87+foYr7bhTlL7/U+7IpaGRIIzLEDiBlydMVkG/Se0IffW1R3n2Hml5dGlRtVmsTzn5FN3ZoxVIW6lyvtON6VhVvC7omMuuUznRlR8Lzh+kwa8eid0j3ci1uQYJhg8Is6ym7PsUPK1hHtCAzh8pFBpQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737659720; c=relaxed/simple; bh=07MvLhT2Wy7RrEKkDU/7g2rxiX30LJFHB9CllhdgXSA=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=jFyGPI3IDm8dVydLJmHQ0kM8QOpZbBM3Mply3cIEPpfCmCZdW0BlfIlGvwRSB8KHzdetf5PegVhSQbLdIbeWg6JWWo5EaOrTlijVXc+wuqHS31EBvAlMGfCSVtgH0L+kzKG5T0zjZH9wk0CfTqL/KH2DmbQUjRt7pNBhUSAz368= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com; spf=pass smtp.mailfrom=rivosinc.com; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b=lBoaD47V; arc=none smtp.client-ip=209.85.214.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b="lBoaD47V" Received: by mail-pl1-f180.google.com with SMTP id d9443c01a7336-2161eb95317so23405435ad.1 for ; Thu, 23 Jan 2025 11:15:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1737659717; x=1738264517; darn=vger.kernel.org; h=cc:to:content-transfer-encoding:mime-version:message-id:date :subject:from:from:to:cc:subject:date:message-id:reply-to; bh=xbFhHhTinc/thmLT0MtA207eqVgoMSXCZVa6DhPymsA=; b=lBoaD47Vb7VhZ4xjVSGmCeywyYqBpktTUPz3SkonjIpmAHstd9REPAQzgtV27tKg4x 8NEGWgmOjHnlxwzuNyLE7eIF8pfXU/CLfIrDgUV8jCHr8f4VBHfAODe0jDEtf8QBOU80 Je20LMQPOv6vjm9r+mIk/jSGFEFN3CYFW+Z9eS8hilFLNFLfgQnXHhuoeK3sEULYYLKK zsWnsgFg4HII2b1j6cSuDwDHLvrvLliX795IgcSI0spMzNyBnk7QShLI6AUNn9k2hXjZ NQbRm291uhWn7m0TTOTuwGTzG0V0hkqgxCbxwl2LHsPa9NdNbRDmWXc8EeOg/wXcxMM9 CQgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1737659717; x=1738264517; h=cc:to:content-transfer-encoding:mime-version:message-id:date :subject:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=xbFhHhTinc/thmLT0MtA207eqVgoMSXCZVa6DhPymsA=; b=vm/9KZt9dD148x2HNGpZjKX3txgQ4qN9KRULGXUVkuurwOMN8HP1CclQTdaR42RlE/ 0b0olyTy5Wk/rvMT2SV0vsyo4RqSnrbmzr3am5TFUbC2Wp4loCiNSZJDJEO5QcIhdGlA v6lQY4CF2gfXv8udQr/0kOS4cOWk/66bS3CtukTyHTgbcEEdDb6rZDjvobQbnxcfNmrY M0Qcw6nxtZxj/j513Qp5kDXebvrh7MaP5ImntJIwERWk6XfOI39cY0l1d0HMJofC5mXj lEdamT2yHFjk/VFJSvI1YkcZhW94bWZUqzVcjkyah1e3nfuueRLgmTuRUePwmBJHQq1e Mk5Q== X-Forwarded-Encrypted: i=1; AJvYcCUUdEqzoaG9jeOMJC/hKipRFDnqT7lq+igCXEPzWVJziZyZ83OPpeWLqlZo9cPnCHwXtiqJmi52HhkqOMY=@vger.kernel.org X-Gm-Message-State: AOJu0YzoOyEIr/wwwAcrhHm5KwqRTyJZ1aiZp6G6PmCy6sZUZMVadN6A cT6wBUu0lWrdp6ZxBAriX9lQ6x1Rxin4cJFDrn+nzwH4SNW4kEBx0r+HnkdQq/U= X-Gm-Gg: ASbGncutND64UJB5Ishkd5PRwov4MOkwWf2XXZ26uoE3NPn5WMSRtWS/uNN7XG8neDt bqt2Po0SdTMsz3kVW5S+WbVZmZV2snEaFRX4wEJHL4hoTPPAKMck4SmIDRa4nzKnDAqAVFY3qh2 brGXOPnkCYfvN/6yr7ZwmZ3t53BWvzaPOESZ1CRTdO03h7FUoM3HDlNQd26BkmZaYBYSTeEdPR7 Gp3nrhdzbbNTzzFZO+NoJGYQ6smFeeCdcyQ6lVzZgfR9Eis2/TJUdTicWGw2paTY96RUUeckzOV M+hXW0YFqrfWP6HlRXtG X-Google-Smtp-Source: AGHT+IHpzV+15pT9rC0dv425JvS+EQ7ijp2j9zmm/V4a6N6t16e1ARxMwg63ScRMethPfVN56ayBDw== X-Received: by 2002:a17:902:eccf:b0:215:7cde:7fa3 with SMTP id d9443c01a7336-21c355301e2mr397914035ad.25.1737659716962; Thu, 23 Jan 2025 11:15:16 -0800 (PST) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21da3ea3cb2sm2504645ad.90.2025.01.23.11.15.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Jan 2025 11:15:15 -0800 (PST) From: Charlie Jenkins Subject: [PATCH v2 0/4] entry: Move ret_from_fork() to C and inline syscall_exit_to_user_mode() Date: Thu, 23 Jan 2025 11:14:28 -0800 Message-Id: <20250123-riscv_optimize_entry-v2-0-7c259492d508@rivosinc.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIABSVkmcC/3WNQQqDMBBFryJZN2UcE9Cueg8RKXGsszCRiYRa8 e6N7rt8D/77u4okTFE9il0JJY4cfAa8FcpNL/8mzUNmhYAGDKAWji71YVl55i/15FfZtK2r2lQ GoUKr8nQRGvlzZdsu88RxDbJdL6k87Rm0UOKfYCo1aEPUWGsbNw7wFE4hsnd3F2bVHcfxA9Aq+ Ji7AAAA X-Change-ID: 20240402-riscv_optimize_entry-583843420325 To: Paul Walmsley , Palmer Dabbelt , Huacai Chen , WANG Xuerui , Thomas Gleixner , Peter Zijlstra , Andy Lutomirski , Alexandre Ghiti Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, Charlie Jenkins X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1931; i=charlie@rivosinc.com; h=from:subject:message-id; bh=07MvLhT2Wy7RrEKkDU/7g2rxiX30LJFHB9CllhdgXSA=; b=owGbwMvMwCXWx5hUnlvL8Y3xtFoSQ/qkqdaz2SP2T34j8rlu2aSJZyu8VfoWbWAwlOEKlThfb pz69blFRykLgxgXg6yYIgvPtQbm1jv6ZUdFyybAzGFlAhnCwMUpABM5dZmRYQN7ftcXnRyDwp93 f5bZ/I1e1yW9ZokJ/yozL/eAozln7BkZHn/4bX1k54E6kchzPancQftU3ngJ7bUJ9XI7LVv6M1i ODQA= X-Developer-Key: i=charlie@rivosinc.com; a=openpgp; fpr=7D834FF11B1D8387E61C776FFB10D1F27D6B1354 Similar to commit 221a164035fd ("entry: Move syscall_enter_from_user_mode() to header file"), move syscall_exit_to_user_mode() to the header file as well. Testing was done with the byte-unixbench [1] syscall benchmark (which calls getpid) and QEMU. On riscv I measured a 7.09246% improvement, on x86 a 2.98843% improvement, on loongarch a 6.07954% improvement, and on s390 a 11.1328% improvement. Since this is on QEMU, I know these numbers are not perfect, but they show a trend of general improvement across all architectures that use the generic entry code. [1] https://github.com/kdlucas/byte-unixbench Signed-off-by: Charlie Jenkins --- Changes in v2: - Fixup compilation issues for loongarch - Fixup compilation issues with CONFIG_CONTEXT_TRACKING_USER - Link to v1: https://lore.kernel.org/r/20250122-riscv_optimize_entry-v1-0-4ee95559cfd0@rivosinc.com --- Charlie Jenkins (4): riscv: entry: Convert ret_from_fork() to C riscv: entry: Split ret_from_fork() into user and kernel loongarch: entry: Migrate ret_from_fork() to C entry: Inline syscall_exit_to_user_mode() arch/loongarch/include/asm/asm-prototypes.h | 5 +++ arch/loongarch/include/asm/switch_to.h | 8 +++++ arch/loongarch/kernel/entry.S | 22 ++++++------- arch/loongarch/kernel/process.c | 34 ++++++++++++++++---- arch/riscv/include/asm/asm-prototypes.h | 2 ++ arch/riscv/kernel/entry.S | 20 +++++++----- arch/riscv/kernel/process.c | 21 +++++++++++-- include/linux/entry-common.h | 43 +++++++++++++++++++++++-- kernel/entry/common.c | 49 +---------------------------- 9 files changed, 125 insertions(+), 79 deletions(-) --- base-commit: ffd294d346d185b70e28b1a28abe367bbfe53c04 change-id: 20240402-riscv_optimize_entry-583843420325 -- - Charlie