mirror_zfs/module
chrisrd e9a7729008 Fix free memory calculation on v3.14+
Provide infrastructure to auto-configure to enum and API changes in the
global page stats used for our free memory calculations.

arc_free_memory has been broken since an API change in Linux v3.14:

2016-07-28 v4.8 599d0c95 mm, vmscan: move LRU lists to node
2016-07-28 v4.8 75ef7184 mm, vmstat: add infrastructure for per-node
  vmstats

These commits moved some of global_page_state() into
global_node_page_state(). The API change was particularly egregious as,
instead of breaking the old code, it silently did the wrong thing and we
continued using global_page_state() where we should have been using
global_node_page_state(), thus indexing into the wrong array via
NR_SLAB_RECLAIMABLE et al.

There have been further API changes along the way:

2017-07-06 v4.13 385386cf mm: vmstat: move slab statistics from zone to
  node counters
2017-09-06 v4.14 c41f012a mm: rename global_page_state to
  global_zone_page_state

...and various (incomplete, as it turns out) attempts to accomodate
these changes in ZoL:

2017-08-24 2209e409 Linux 4.8+ compatibility fix for vm stats
2017-09-16 787acae0 Linux 3.14 compat: IO acct, global_page_state, etc
2017-09-19 661907e6 Linux 4.14 compat: IO acct, global_page_state, etc

The config infrastructure provided here resolves these issues going back
to the original API change in v3.14 and is robust against further Linux
changes in this area.

Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Chris Dunlop <chris@onthe.net.au>
Closes #7170
2018-02-23 08:50:06 -08:00
..
avl Support -fsanitize=address with --enable-asan 2018-01-10 10:49:27 -08:00
icp Change movaps to movups in AES-NI code 2018-01-31 15:17:56 -08:00
lua OpenZFS 9035 - zfs: this statement may fall through 2018-02-21 14:55:34 -08:00
nvpair Support -fsanitize=address with --enable-asan 2018-01-10 10:49:27 -08:00
unicode Support -fsanitize=address with --enable-asan 2018-01-10 10:49:27 -08:00
zcommon Project Quota on ZFS 2018-02-13 14:54:54 -08:00
zfs Fix free memory calculation on v3.14+ 2018-02-23 08:50:06 -08:00
.gitignore Improve gitignore 2017-05-25 10:14:13 -07:00
Makefile.in OpenZFS 7431 - ZFS Channel Programs 2018-02-08 15:28:18 -08:00