OpenZFS on Linux and FreeBSD
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Matthew Ahrens 4a87c280dc Channel program may spuriously fail with "memory limit exhausted"
ZFS channel programs (invoked by `zfs program`) are executed in a LUA
sandbox with a limit on the amount of memory they can consume.  The
limit is 10MB by default, and can be raised to 100MB with the `-m` flag.
If the memory limit is exceeded, the LUA program exits and the command
fails with a message like `Channel program execution failed: Memory
limit exhausted.`

The LUA sandbox allocates memory with `vmem_alloc(KM_NOSLEEP)`, which
will fail if the requested memory is not immediately available.  In this
case, the program fails with the same message, `Memory limit exhausted`.
However, in this case the specified memory limit has not been reached,
and the memory may only be temporarily unavailable.

This commit changes the LUA memory allocator `zcp_lua_alloc()` to use
`vmem_alloc(KM_SLEEP)`, so that we won't spuriously fail when memory is
temporarily low.  Instead, we rely on the system to be able to free up
memory (e.g. by evicting from the ARC), and we assume that even at the
highest memory limit of 100MB, the channel program will not truly
exhaust the system's memory.

External-issue: DLPX-71924
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes #11190
2020-11-12 09:02:00 -08:00
.github Update issue templates, commitcheck and Contributing.md 2020-10-30 15:56:58 -07:00
cmd Fix memleak in cmd/mount_zfs.c 2020-11-11 11:09:31 -08:00
config Linux 5.10 compat: revalidate_disk_size() added 2020-11-03 09:51:31 -08:00
contrib initramfs: zfsunlock hook breaks /usr/bin 2020-11-11 11:07:40 -08:00
etc Replace ZFS on Linux references with OpenZFS 2020-10-16 13:01:24 -07:00
include G/C struct znode -> z_moved 2020-11-11 11:40:15 -08:00
lib Fix pointer-is-uint64_t-sized assumption in the ioctl path 2020-11-11 11:09:41 -08:00
man zpoolprops.8: clarify vdev expansion rules 2020-11-11 11:08:57 -08:00
module Channel program may spuriously fail with "memory limit exhausted" 2020-11-12 09:02:00 -08:00
rpm Replace ZFS on Linux references with OpenZFS 2020-10-16 13:01:24 -07:00
scripts Fix commitcheck on FreeBSD 2020-10-30 15:57:03 -07:00
tests Linux: Fix mount/unmount when dataset name has a space 2020-11-12 09:01:55 -08:00
udev Centralize variable substitution 2020-07-14 17:33:44 -07:00
.editorconfig Add an .editorconfig; document git whitespace settings 2020-01-27 13:32:52 -08:00
.gitignore Add FreeBSD support to OpenZFS 2020-04-14 11:36:28 -07:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
AUTHORS Add zstd support to zfs 2020-08-20 10:30:06 -07:00
CODE_OF_CONDUCT.md Replace ZFS on Linux references with OpenZFS 2020-10-16 13:01:24 -07:00
COPYRIGHT Fix typos 2020-06-09 21:24:09 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
META Tag 2.0.0-rc5 2020-11-03 10:25:31 -08:00
Makefile.am Fix commitcheck on FreeBSD 2020-10-30 15:57:03 -07:00
NEWS Fix NEWS file 2020-08-27 16:07:01 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md docs: update README's installation link 2020-10-16 13:00:13 -07:00
TEST Remove CI builder customization from TEST 2020-03-16 10:46:03 -07:00
autogen.sh Cause autogen.sh to fail if autoreconf fails 2018-07-06 09:27:37 -07:00
configure.ac Linux: Initialize zp in zfs_setattr_dir 2020-10-16 13:01:29 -07:00
copy-builtin Replace ZFS on Linux references with OpenZFS 2020-10-16 13:01:24 -07:00
cppcheck-suppressions.txt Import ZStandard v1.4.5 2020-08-20 10:30:06 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.md

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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.

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Official Resources

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 META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are 12-STABLE and 13-CURRENT.