8fd65351a7
As soon as wait4() returns, fork() can immediately return with the same PID, and race to lock _launched_processes_lock, then try to add the new (duplicate) PID to _launched_processes, which asserts By locking before wait4(), we ensure, that, given that same unfortunate scheduling, _launched_processes_lock cannot be locked by the spawner before we pop the process in the reaper, and only afterward will it be added This moves where the reaper idles when there are children from the wait4() to the pause(), locking for the duration of that single syscall in both the no-children and running-children cases; the impact of this is one to two syscalls (depending on _launched_processes_lock state) per loop Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Don Brady <don.brady@delphix.com> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #11924 Closes #11928 |
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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.