zfs/man/man4
shodanshok bbe8512a93
Ignore zfs_arc_shrinker_limit in direct reclaim mode
zfs_arc_shrinker_limit (default: 10000) avoids ARC collapse
due to excessive memory reclaim. However, when the kernel is
in direct reclaim mode (ie: low on memory), limiting ARC reclaim
increases OOM risk. This is especially true on system without
(or with inadequate) swap.

This patch ignores zfs_arc_shrinker_limit when the kernel is in
direct reclaim mode, avoiding most OOM. It also restores
"echo 3 > /proc/sys/vm/drop_caches" ability to correctly drop
(almost) all ARC.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Adam Moss <c@yotes.com>
Signed-off-by: Gionatan Danti <g.danti@assyoma.it>
Closes 
2024-08-21 10:00:33 -07:00
..
spl.4 spl-proc: remove old taskq stats 2024-08-19 09:50:45 -07:00
zfs.4 Ignore zfs_arc_shrinker_limit in direct reclaim mode 2024-08-21 10:00:33 -07:00