fc45975ec8
The Blocking Queue (bqueue) code is used by zfs send/receive to send messages between the various threads. It uses a shared linked list, which is locked whenever we enqueue or dequeue. For workloads which process many blocks per second, the locking on the shared list can be quite expensive. This commit changes the bqueue logic to have 3 linked lists: 1. An enquing list, which is used only by the (single) enquing thread, and thus needs no locks. 2. A shared list, with an associated lock. 3. A dequing list, which is used only by the (single) dequing thread, and thus needs no locks. The entire enquing list can be moved to the shared list in constant time, and the entire shared list can be moved to the dequing list in constant time. These operations only happen when the `fill_fraction` is reached, or on an explicit flush request. Therefore, the lock only needs to be acquired infrequently. The API already allows for dequing to block until an explicit flush, so callers don't need to be changed. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Wilson <george.wilson@delphix.com> Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #14121 |
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README.md
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.