From patchwork Wed Oct 2 18:49:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 13820277 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 151C512C54D; Wed, 2 Oct 2024 18:49:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727894993; cv=none; b=gObJ2rs+nzmFJ64yR4mU8cPoICG23SjslHeer/XCllCncuRzGHsJF2c11/OxLmVrFsXxwLOiFWtczepXsLRYdn0BNo5y5dU6xV76Rpr+S1m/yOAoQnSC77FCCpT01ZzAdg5/6GdLVyOxp9YsdrH6eS31p+l1qlDlmRi/S4GrpZ0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727894993; c=relaxed/simple; bh=bkr/giBTZadF4+ZaiqM9ZsvG/mHxPB6xi2TaYAALx5E=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=H7DFFIQEJlQ7JvQk9N4q2H15cGRdNHwgTWGO6oX/tY+q6ptt7oesZPh+WR9vgtk2qaotx7Kn8lk5MxI4PN97hHuCUq3/WQRCSaA86rf6715OX9CuLwrkigd6Cv5XxyH8LhbkC+Pb227wGTlc5BlIuRrNJqE+SWYqGGZ+Q8SIWH4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LTOBUXlL; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LTOBUXlL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F36A2C4CEC2; Wed, 2 Oct 2024 18:49:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727894992; bh=bkr/giBTZadF4+ZaiqM9ZsvG/mHxPB6xi2TaYAALx5E=; h=From:Subject:Date:To:Cc:From; b=LTOBUXlL6D2ckQYybkdmOWsZzG2yHmK14UFnGZpmydG5YBgdkkKttR4EwCpHBIqUA skJdfpEhebw4UzbgcWxV6PemWSdZBcKCcApa6WfsN/l613bwcpsV29Rfk2zn25oglC vaEqSLJQtts3g0P1RGnt9ODaU6nSahiVv9eg+O0GmNhttqykL90DMGTQAk/dovOLEy prSfA6XLGs1emmxJ1GKDxG+ejZ526z1ednTpcg8D0mgGHfohtQMjDP3KMoKfOhk8uD XLaUhkZD+DGlvA3Oz+dJY/m1Y6tRSpLt+ji0XQEVTwHx/HuGxAN2iQCCTqg7lwY4Qo KmFujK/ZUY+Ug== From: Jeff Layton Subject: [PATCH v9 00/12] fs: multigrain timestamp redux Date: Wed, 02 Oct 2024 14:49:28 -0400 Message-Id: <20241002-mgtime-v9-0-77e2baad57ac@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIALiV/WYC/2XNTQ6CMBCG4auQrq2Z/gCtK+9hXFA6QqOCaUmjI dzdghE1Lr9Jn7cjCegdBrLLRuIxuuD6Lg29yUjdVl2D1Nm0CQcuQTNBr83grkg51FqZ2lZKIUm Pbx5P7r6EDse0WxeG3j+Wbizm6ytRsvydiAUFKhXmVkhjuan2Z/QdXra9b8jciOXHfX0dy+Q0t xI4oDAAf06tjgGw1anZgRBSWM1MLX7cNE1Py3mcRA0BAAA= To: John Stultz , Thomas Gleixner , Stephen Boyd , Alexander Viro , Christian Brauner , Jan Kara , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Randy Dunlap , Chandan Babu R , "Darrick J. Wong" , Theodore Ts'o , Andreas Dilger , Chris Mason , Josef Bacik , David Sterba , Hugh Dickins , Andrew Morton , Chuck Lever , Vadim Fedorenko Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-mm@kvack.org, Jeff Layton X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=4801; i=jlayton@kernel.org; h=from:subject:message-id; bh=bkr/giBTZadF4+ZaiqM9ZsvG/mHxPB6xi2TaYAALx5E=; b=owEBbQKS/ZANAwAIAQAOaEEZVoIVAcsmYgBm/ZXGaarTxxkWaNZ/Bc1x5dRpKVleGFmW4G93p yeU+T33FouJAjMEAAEIAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCZv2VxgAKCRAADmhBGVaC FaalEAClzTf0+QC+AiBd5ATPquIjfAeFwnewaup6LZ/09jEA0sS0+bxA8pbRMLDga7cYu4LfYSe fN3F9l9h+JBHlo9dFG+ep0UUlgCQmA75t5aSnJWUKAZh4NYy4/JUayrZlcUdXU+tTRiPSButiUj G2wrHgeelBzrjzlYuF7W5MUu2rR9wJTCbiwVMpxub6YBWoA8emENI+aGinV41vUjPQGDvGInzfG 4ONhuU2Tm/ZR3CHANJ4FBW2GYMeURFV7eyy/g8miB6UlFt1eTNWb1HpR58zaKd2F5ofHZJ0Rueg 0MmYXXfuDrsBGPlwyxMSH+b9KE+FRf+2E311ToVif53zKGUWSISz57YGGwCFN4M0o45dt9J+XQw Sr9JJjGq6j6UNhiPAHxHPqJaGDzhsiPhUbbfJlW6Fd4Sfst6DSO6xIABQW8uptQ9sI1OROKRtlS MPqbE5NLAr/E0JGt6XfJkjhTSA+KLDBDwlDi7l3wWlk6Kf8wWC8Z86XTghHwBq6YsHHD5qC4fLJ 2RJSNv4OLQm4mxM9Tkn+9J1l2D6IP2A0+r/PDiXyhYw9slEar48XLomicHODNoS8BiD55LyPI7T pEQighu0Eo1xlGGpLxv3/nB1OLunevvbeOFNzSCz2LZPqCbux82f3Woht/OvZ5zbFCJneU3wrDx 0H9IS0cpGNM8ioA== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 This is a replacement for the v6 series sitting in Christian's vfs.mgtime branch. The main changes here are to the changelogs, documentation and comments. The code itself is largely unchanged. The pipe1_threads test shows these averages on my test rig with this series: v6.11: 89233600 (baseline) v6.11 + v9 series: 88460897 (<1% slower) Acked-by's and Reviewed-by's would be welcome (particularly from the timekeeper folks). Signed-off-by: Jeff Layton --- Changes in v9: - Comment and documentation cleanups. - Drop the EXPORT_SYMBOL_GPL() from new timekeeper interfaces - Link to v8: https://lore.kernel.org/r/20241001-mgtime-v8-0-903343d91bc3@kernel.org Changes in v8: - split patch that adds percpu counters into fs and timekeeping patches - convert percpu counters to unsigned longs - directly access the offs_real value in timekeeper instead of going through offsets array - drop WARN_ON's in timekeeping patches - better changelogs and more comments for the timekeeping bits - better document how backward realtime clock jumps affect things - Link to v7: https://lore.kernel.org/r/20240913-mgtime-v7-0-92d4020e3b00@kernel.org Changes in v7: - move the floor value handling into timekeeper for better performance - Link to v6: https://lore.kernel.org/r/20240715-mgtime-v6-0-48e5d34bd2ba@kernel.org Changes in v6: - Normalize timespec64 in inode_set_ctime_to_ts - use DEFINE_PER_CPU counters for better vfs consistency - skip ctime cmpxchg if the result means nothing will change - add trace_ctime_xchg_skip to track skipped ctime updates - use __print_flags in ctime_ns_xchg tracepoint - Link to v5: https://lore.kernel.org/r/20240711-mgtime-v5-0-37bb5b465feb@kernel.org Changes in v5: - refetch coarse time in coarse_ctime if not returning floor - timestamp_truncate before swapping new ctime value into place - track floor value as atomic64_t - cleanups to Documentation file - Link to v4: https://lore.kernel.org/r/20240708-mgtime-v4-0-a0f3c6fb57f3@kernel.org Changes in v4: - reordered tracepoint fields for better packing - rework percpu counters again to also count fine grained timestamps - switch to try_cmpxchg for better efficiency - Link to v3: https://lore.kernel.org/r/20240705-mgtime-v3-0-85b2daa9b335@kernel.org Changes in v3: - Drop the conversion of i_ctime fields to ktime_t, and use an unused bit of the i_ctime_nsec field as QUERIED flag. - Better tracepoints for tracking floor and ctime updates - Reworked percpu counters to be more useful - Track floor as monotonic value, which eliminates clock-jump problem Changes in v2: - Added Documentation file - Link to v1: https://lore.kernel.org/r/20240626-mgtime-v1-0-a189352d0f8f@kernel.org --- Jeff Layton (12): timekeeping: add interfaces for handling timestamps with a floor value fs: add infrastructure for multigrain timestamps fs: have setattr_copy handle multigrain timestamps appropriately fs: handle delegated timestamps in setattr_copy_mgtime fs: tracepoints around multigrain timestamp events fs: add percpu counters for significant multigrain timestamp events timekeeping: add percpu counter for tracking floor swap events Documentation: add a new file documenting multigrain timestamps xfs: switch to multigrain timestamps ext4: switch to multigrain timestamps btrfs: convert to multigrain timestamps tmpfs: add support for multigrain timestamps Documentation/filesystems/index.rst | 1 + Documentation/filesystems/multigrain-ts.rst | 125 ++++++++++++ fs/attr.c | 60 +++++- fs/btrfs/file.c | 25 +-- fs/btrfs/super.c | 3 +- fs/ext4/super.c | 2 +- fs/inode.c | 282 +++++++++++++++++++++++++--- fs/stat.c | 46 ++++- fs/xfs/libxfs/xfs_trans_inode.c | 6 +- fs/xfs/xfs_iops.c | 10 +- fs/xfs/xfs_super.c | 2 +- include/linux/fs.h | 36 +++- include/linux/timekeeping.h | 5 + include/trace/events/timestamp.h | 124 ++++++++++++ kernel/time/timekeeping.c | 106 +++++++++++ kernel/time/timekeeping_debug.c | 13 ++ kernel/time/timekeeping_internal.h | 9 + mm/shmem.c | 2 +- 18 files changed, 784 insertions(+), 73 deletions(-) --- base-commit: 7f1416b4fe6bd3363878a91894cd770f8ee1b5d0 change-id: 20240913-mgtime-20c98bcda88e Best regards,