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Matthew Ahrens 7b232e9354
arcstat: add 'avail', fix 'free' 
The meaning of the `free` field is currently `zfs_arc_sys_free`, which
is the target amount of memory to leave free for the system, and is
constant after booting.

This commit changes the meaning of `free` to arc_free_memory(), the
amount of memory that the ARC considers to be free.

It also adds a new arcstat field `avail`, which tracks
`arc_available_memory()`.

Since `avail` can be negative, it also updates the arcstat script to
pretty-print negative values.

example output:

  $ arcstat -f time,miss,arcsz,c,grow,need,free,avail 1
      time  miss  arcsz     c  grow  need  free  avail
  15:03:02   39K   114G  114G     0     0  2.4G  407M
  15:03:03   42K   114G  114G     0     0  2.1G  120M
  15:03:04   40K   114G  114G     0     0  1.8G  -177M
  15:03:05   24K   113G  112G     0     0  1.7G  -269M
  15:03:06   29K   111G  110G     0     0  1.6G  -385M
  15:03:07   27K   110G  108G     0     0  1.4G  -535M
  15:03:08   13K   108G  108G     0     0  2.2G  239M
  15:03:09   33K   107G  107G     0     0  1.3G  -639M
  15:03:10   16K   105G  102G     0     0  2.6G  704M
  15:03:11  7.2K   102G  102G     0     0  5.1G  3.1G
  15:03:12   42K   103G  102G     0     0  4.8G  2.8G

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes #10494
2020-06-26 18:05:28 -07:00
.github Update wiki links with new address 2020-06-03 19:46:31 -07:00
cmd arcstat: add 'avail', fix 'free' 2020-06-26 18:05:28 -07:00
config Fixes for make dist 2020-06-26 14:20:02 -07:00
contrib Fixes for make dist 2020-06-26 14:20:02 -07:00
etc Fixes for make dist 2020-06-26 14:20:02 -07:00
include Fixes for make dist 2020-06-26 14:20:02 -07:00
lib Fixes for make dist 2020-06-26 14:20:02 -07:00
man arcstat: add 'avail', fix 'free' 2020-06-26 18:05:28 -07:00
module Include FreeBSD sources in module dist 2020-06-26 14:19:35 -07:00
rpm pam: implement a zfs_key pam module 2020-06-24 18:45:44 -07:00
scripts Drop unnecessary srcdir paths 2020-06-24 18:20:18 -07:00
tests Add block histogram to zdb 2020-06-26 15:09:20 -07:00
udev Fixes for make dist 2020-06-26 14:20:02 -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
.travis.yml Add .travis.yml 2017-11-13 09:18:18 -08:00
AUTHORS Update build system and packaging 2018-05-29 16:00:33 -07:00
autogen.sh Cause autogen.sh to fail if autoreconf fails 2018-07-06 09:27:37 -07:00
CODE_OF_CONDUCT.md Add CODE_OF_CONDUCT.md 2019-04-30 10:58:45 -07:00
configure.ac Fixes for make dist 2020-06-26 14:20:02 -07:00
copy-builtin Move zfs_gitrev.h to build directory 2020-06-24 18:19:28 -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
Makefile.am Fixes for make dist 2020-06-26 14:20:02 -07:00
META Linux 5.7 compat: blk_alloc_queue() 2020-04-09 09:16:46 -07:00
NEWS Add NEWS file 2018-09-18 12:03:47 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md Update wiki links with new address 2020-06-03 19:46:31 -07:00
TEST Remove CI builder customization from TEST 2020-03-16 10:46:03 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.md

img

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 Linux distribution can be found at the ZoL Site.

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.