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Mon, 31 Mar 2025 09:15:00 +0000 From: Hans Holmberg To: Carlos Maiolino , Dave Chinner , "Darrick J . Wong" CC: hch , "linux-xfs@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Hans Holmberg Subject: [PATCH] xfs: document zoned rt specifics in admin-guide Thread-Topic: [PATCH] xfs: document zoned rt specifics in admin-guide Thread-Index: AQHboh1g0lt5Uvc2qkuGocBjSjWLeg== Date: Mon, 31 Mar 2025 09:15:00 +0000 Message-ID: <20250331091333.6799-1-hans.holmberg@wdc.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.47.0 authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=wdc.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: PH7PR04MB8755:EE_|PH0PR04MB8241:EE_ x-ms-office365-filtering-correlation-id: c1b72a7a-cc5b-4388-c9cd-08dd70348357 x-ld-processed: b61c8803-16f3-4c35-9b17-6f65f441df86,ExtAddr wdcipoutbound: EOP-TRUE x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|366016|1800799024|376014|38070700018; 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Also add documentation describing the max_open_zones sysfs attribute exposed in /sys/fs/xfs//zoned/ Fixes: 4e4d52075577 ("xfs: add the zoned space allocator") Signed-off-by: Hans Holmberg Reviewed-by: "Darrick J. Wong" --- Documentation/admin-guide/xfs.rst | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/Documentation/admin-guide/xfs.rst b/Documentation/admin-guide/xfs.rst index b67772cf36d6..9d0344ce81f1 100644 --- a/Documentation/admin-guide/xfs.rst +++ b/Documentation/admin-guide/xfs.rst @@ -124,6 +124,14 @@ When mounting an XFS filesystem, the following options are accepted. controls the size of each buffer and so is also relevant to this case. + lifetime (default) or nolifetime + Enable data placement based on write life time hints provided + by the user. This turns on co-allocation of data of similar + life times when statistically favorable to reduce garbage + collection cost. + + These options are only available for zoned rt file systems. + logbsize=value Set the size of each in-memory log buffer. The size may be specified in bytes, or in kilobytes with a "k" suffix. @@ -143,6 +151,14 @@ When mounting an XFS filesystem, the following options are accepted. optional, and the log section can be separate from the data section or contained within it. + max_open_zones=value + Specify the max number of zones to keep open for writing on a + zoned rt device. Many open zones aids file data separation + but may impact performance on HDDs. + + If ``max_open_zones`` is not specified, the value is determined + by the capabilities and the size of the zoned rt device. + noalign Data allocations will not be aligned at stripe unit boundaries. This is only relevant to filesystems created @@ -542,3 +558,16 @@ The interesting knobs for XFS workqueues are as follows: nice Relative priority of scheduling the threads. These are the same nice levels that can be applied to userspace processes. ============ =========== + +Zoned Filesystems +================= + +For zoned file systems, the following attribute is exposed in: + + /sys/fs/xfs//zoned/ + + max_open_zones (Min: 1 Default: Varies Max: UINTMAX) + This read-only attribute exposes the maximum number of open zones + available for data placement. The value is determined at mount time and + is limited by the capabilities of the backing zoned device, file system + size and the max_open_zones mount option.