From patchwork Mon Jul 15 12:48:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 13733467 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 0826118C176; Mon, 15 Jul 2024 12:49:10 +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=1721047751; cv=none; b=UTiZOO4klNFjygCkS4m+7E39WP7fmJuCBRgSK0ZNDUcehapXaEMWxVO1J/n8LtobChAJ4gJyT+IugEg/LSWwQUS7+82jMKwW6UD7FWKWCjXDuDfvWU25FPmzDwIvTjnlE91zp6+Fljj+D9kz9wF4o2Sf5MDxDisAX4KWpbegyMo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721047751; c=relaxed/simple; bh=xFFgpft1Mea2W1k9CRfnoGMXT8jsvAC5W7aI49zY2Ho=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=XsbhcRmzenHvMKxFjCO9t2VfP7tScdIiWJSDyORlINKZm+M11+6hne6RDEpdCfZn0eJGxYTSeOgHtvfVbmf7DmaOEK/Kpzzx1J264z8avgOWZQZwHNSrC/GFgIFel4fgsapAITcGgYeZUkYePxKcPHjySrVMnsOU4ymXVmdxGdw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hHO0YxtV; 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="hHO0YxtV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE245C32782; Mon, 15 Jul 2024 12:49:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1721047750; bh=xFFgpft1Mea2W1k9CRfnoGMXT8jsvAC5W7aI49zY2Ho=; h=From:Subject:Date:To:Cc:From; b=hHO0YxtV0sA7lKQy/qpLsAUoBj1SK5dbWWh/2CEfEcmYykhD36/pSSmr7qi/ixBVF jQ0qVn2G1Kctx7Xm/CRjFjBCp0cmcJrckKdNxBA084n9hdWkj55fal7wkSfI0Bwhkn e2/wyIH70/thsGeXp+3qb9BEC1AxXsogak1p2XusxeoG/s9fCWGxD7amUEZz6nz/Kz +eSbbBfQMq8Oguwj6tUjlMYhaHKipf4O+J+TxukYaaBTMYbvn4bFjCkS0gS6nEDygw LOhWc+6Z9oxKKkF9i/dNle20vVbucj4mcDeyWNQz+SaZ0KzI1jvKqTywtRnUVppgrM frsjZG+6s597g== From: Jeff Layton Subject: [PATCH v6 0/9] fs: multigrain timestamp redux Date: Mon, 15 Jul 2024 08:48:51 -0400 Message-Id: <20240715-mgtime-v6-0-48e5d34bd2ba@kernel.org> Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIALMalWYC/2XOQW7DIBAF0KtErEs0AwyGrHqPqgsw4KA0doUjq 1Xkuwdn4Tjy8o/mff07G2PJcWSnw52VOOUxD30N+uPA2rPru8hzqJkJEAq00Pza3fI1cmqDAY8 mGARWn39LTPnvWfT1XfM5j7eh/D97J1yuu4oJOXCHxkoSAZJJn5dY+vhzHErHlo5JvFwDuDpRH dqgUDirINidk1tHq5PVGfIiOGe9lLRzauvM6tSyE5JsdfLUJLlztHH42knVycZ78kpTiv7NzfP 8AGWAWtd9AQAA To: Alexander Viro , Christian Brauner , Jan Kara , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Chandan Babu R , "Darrick J. Wong" , Theodore Ts'o , Andreas Dilger , Chris Mason , Josef Bacik , David Sterba , Hugh Dickins , Andrew Morton , Jonathan Corbet Cc: Dave Chinner , Andi Kleen , Christoph Hellwig , Uros Bizjak , Kent Overstreet , Arnd Bergmann , Randy Dunlap , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-mm@kvack.org, linux-nfs@vger.kernel.org, linux-doc@vger.kernel.org, Jeff Layton X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3631; i=jlayton@kernel.org; h=from:subject:message-id; bh=xFFgpft1Mea2W1k9CRfnoGMXT8jsvAC5W7aI49zY2Ho=; b=kA0DAAgBAA5oQRlWghUByyZiAGaVGr2g4UrC2NR/JuNqzaZKyhN0Ef4ZmpMvcH7PbDDPZHHRV IkCMwQAAQgAHRYhBEvA17JEcbKhhOr10wAOaEEZVoIVBQJmlRq9AAoJEAAOaEEZVoIVTjQP/jX+ FkDKAs3wVJ5Axae25xxqh3+9eKr0TZGpOgkPagjwLT6v3f9XdjTx2D+ny31MbxZx/8McTCh5CqJ MGiEx4rfChljA39Fo/tW9wXGqNRPbnTWdKXc4PfP6WoC0NVtDBRFQtLB9NypjpBFG8NEMhzxWHi 7d4e3cfDb9xiU6JM0NjmIligXvUQiWXAKnzPfPQO2IFF4dbLuMieQdwv2aJcpR6dFseL1XsEWSP CEvJfHO1LicNtZ2HnTCUN4THmgXqRq2+DCAh13kGt63mbgaWg2ZdMaxzjlKn0Q6PzgYGca0jJJS /6R4MROk86E+GnGt7CkR42Qll5QKwzReKTCAlZBQBuECkMcOTMGUaJnMKBb4aSH+pgfdEO53CQ3 f/jO/nubRe3e1M7r7xjT3fGDfTXAecDgT8CjXnAlGDjyXfapx+cjnMSROMycWqsPxaVAlZmSKXt nxZ5qgK/wv5IwQt9KknfIKDoV6xiK+u27ekJ+feAYc/e5dUd+m2AzN+LIf3X0K8n917ky5sZKvB mhpyaxFsNuX78/dILLUSGbie3FmjWHzJokfYwLfrwSUt3LYE4YXJ/gXEgHs+eQhmU8HV0GiD4QQ nKvv2railk/i6NH5pvQy2msnvWcNvs2yvwaMevWsvEqFLM6yFTMJH90b3Rw/l3SSF7mq6YQrGzf DJstS X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 I think this is pretty much ready for linux-next now. Since the latest changes are pretty minimal, I've left the Reviewed-by's intact. It would be nice to have acks or reviews from maintainers for ext4 and tmpfs too. I did try to plumb this into bcachefs too, but the way it handles timestamps makes that pretty difficult. It keeps the active copies in an internal representation of the on-disk inode and periodically copies them to struct inode. This is backward from the way most blockdev filesystems do this. Christian, would you be willing to pick these up with an eye toward v6.12 after the merge window settles? Thanks! Signed-off-by: Jeff Layton --- 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 (9): fs: add infrastructure for multigrain timestamps fs: tracepoints around multigrain timestamp events fs: add percpu counters for significant multigrain timestamp events fs: have setattr_copy handle multigrain timestamps appropriately 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/multigrain-ts.rst | 120 +++++++++++++ fs/attr.c | 52 +++++- fs/btrfs/file.c | 25 +-- fs/btrfs/super.c | 3 +- fs/ext4/super.c | 2 +- fs/inode.c | 251 +++++++++++++++++++++++++--- fs/stat.c | 39 ++++- fs/xfs/libxfs/xfs_trans_inode.c | 6 +- fs/xfs/xfs_iops.c | 10 +- fs/xfs/xfs_super.c | 2 +- include/linux/fs.h | 34 +++- include/trace/events/timestamp.h | 124 ++++++++++++++ mm/shmem.c | 2 +- 13 files changed, 592 insertions(+), 78 deletions(-) --- base-commit: bb83a76c647a96db4c9ae77b0577170da4d7bd77 change-id: 20240626-mgtime-5cd80b18d810 Best regards,