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Page writebacks with WB_SYNC_NONE can take several seconds to complete since they wait for the transaction group to close before being committed. This is usually not a problem since the caller does not need to wait. However, if we're simultaneously doing a writeback with WB_SYNC_ALL (e.g via msync), the latter can block for several seconds (up to zfs_txg_timeout) due to the active WB_SYNC_NONE writeback since it needs to wait for the transaction to complete and the PG_writeback bit to be cleared. This commit deals with 2 cases: - No page writeback is active. A WB_SYNC_ALL page writeback starts and even completes. But when it's about to check if the PG_writeback bit has been cleared, another writeback with WB_SYNC_NONE starts. The sync page writeback ends up waiting for the non-sync page writeback to complete. - A page writeback with WB_SYNC_NONE is already active when a WB_SYNC_ALL writeback starts. The WB_SYNC_ALL writeback ends up waiting for the WB_SYNC_NONE writeback. The fix works by carefully keeping track of active sync/non-sync writebacks and committing when beneficial. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Shaan Nobee <sniper111@gmail.com> Closes #12662 Closes #12790 |
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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.