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Matthew Ahrens
4e1d1b4b92
If the system is very low on memory (specifically, `arc_free_memory() < arc_sys_free/2`, i.e. less than 1/16th of RAM free), `arc_evict_state_impl()` will defer wakups. In this case, the arc_evict_waiter_t's remain on the list, even though `arc_evict_count` has been incremented past their `aew_count`. The problem is that `arc_wait_for_eviction()` assumes that if there are waiters on the list, the count they are waiting for has not yet been reached. However, the deferred wakeups may violate this, causing `ASSERT(last->aew_count > arc_evict_count)` to fail. This commit resolves the issue by having new waiters use the greater of `arc_evict_count` and the last `aew_count`. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Wilson <gwilson@delphix.com> Reviewed-by: George Amanakis <gamanakis@gmail.com> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #11285 Closes #11397
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 12-STABLE and 13-CURRENT.