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`lseek(SEEK_DATA | SEEK_HOLE)` are only accurate when the on-disk blocks reflect all writes, i.e. when there are no dirty data blocks. To ensure this, if the target dnode is dirty, they wait for the open txg to be synced, so we can call them "stabilizing operations". If they cause txg_wait_synced often, it can be detrimental to performance. Typically, a group of files are all modified, and then SEEK_DATA/HOLE are performed on them. In this case, the first SEEK does a txg_wait_synced(), and subsequent SEEKs don't need to wait, so performance is good. However, if a workload involves an interleaved metadata modification, the subsequent SEEK may do a txg_wait_synced() unnecessarily. For example, if we do a `read()` syscall to each file before we do its SEEK. This applies even with `relatime=on`, when the `read()` is the first read after the last write. The txg_wait_synced() is unnecessary because the SEEK operations only care that the structure of the tree of indirect and data blocks is up to date on disk. They don't care about metadata like the contents of the bonus or spill blocks. (They also don't care if an existing data block is modified, but this would be more involved to filter out.) This commit changes the behavior of SEEK_DATA/HOLE operations such that they do not call txg_wait_synced() if there is only a pending change to the bonus or spill block. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #13368 Issue #14594 Issue #14512 Issue #14009 |
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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.
Official Resources
- Documentation - for using and developing this repo
- ZoL Site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
Installation
Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.
Contribute & Develop
We have a separate document with contribution guidelines.
We have a Code of Conduct.
Release
OpenZFS is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 12.2-RELEASE.