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Linux: Report reclaimable memory to kernel as such (#16385)

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Linux provides SLAB_RECLAIM_ACCOUNT and __GFP_RECLAIMABLE flags to
mark memory allocations that can be freed via shinker calls.  It
should allow kernel to tune and group such allocations for lower
memory fragmentation and better reclamation under pressure.

This patch marks as reclaimable most of ARC memory, directly
evictable via ZFS shrinker, plus also dnode/znode/sa memory,
indirectly evictable via kernel's superblock shrinker.

Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Allan Jude <allan@klarasystems.com>
This commit is contained in:
Alexander Motin
2024-07-30 14:40:47 -04:00
committed by Tony Hutter
parent 05d6f621a9
commit ca95fa3531
14 changed files with 29 additions and 14 deletions
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include/os/freebsd/spl/sys/kmem.h
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@@ -49,6 +49,7 @@ MALLOC_DECLARE(M_SOLARIS);
#define KM_NOSLEEP M_NOWAIT
#define KM_NORMALPRI 0
#define KMC_NODEBUG UMA_ZONE_NODUMP
#define KMC_RECLAIMABLE 0x0
typedef struct vmem vmem_t;