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enforce arc_dnode_limit

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Linux kernel shrinker in the context of null/root memcg does not scan
dentry and inode caches added by a task running in non-root memcg. For
ZFS this means that dnode cache routinely overflows, evicting valuable
meta/data and putting additional memory pressure on the system.

This patch restores zfs_prune_aliases as fallback when the kernel
shrinker does nothing, enabling zfs to actually free dnodes. Moreover,
it (indirectly) calls arc_evict when dnode_size > dnode_limit.

Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Gionatan Danti <g.danti@assyoma.it>
Closes #17487
Closes #17542
This commit is contained in:
shodanshok
2025-07-21 19:32:01 +02:00
committed by Tony Hutter
parent 10208765ea
commit 2910b5f5ca
3 changed files with 78 additions and 11 deletions
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include/sys/arc_impl.h
+1 -1
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@@ -952,7 +952,7 @@ typedef struct arc_sums {
wmsum_t arcstat_data_size;
wmsum_t arcstat_metadata_size;
wmsum_t arcstat_dbuf_size;
wmsum_t arcstat_dnode_size;
aggsum_t arcstat_dnode_size;
wmsum_t arcstat_bonus_size;
wmsum_t arcstat_l2_hits;
wmsum_t arcstat_l2_misses;