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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
Download Patch File Download Diff File Expand all files Collapse all files
module/os/linux/zfs/abd_os.c
+3 -3
View File
@@ -281,7 +281,7 @@ abd_alloc_chunks(abd_t *abd, size_t size)
struct sg_table table;
struct scatterlist *sg;
struct page *page, *tmp_page = NULL;
gfp_t gfp = __GFP_NOWARN | GFP_NOIO;
gfp_t gfp = __GFP_RECLAIMABLE | __GFP_NOWARN | GFP_NOIO;
gfp_t gfp_comp = (gfp | __GFP_NORETRY | __GFP_COMP) & ~__GFP_RECLAIM;
unsigned int max_order = MIN(zfs_abd_scatter_max_order,
ABD_MAX_ORDER - 1);
@@ -403,7 +403,7 @@ abd_alloc_chunks(abd_t *abd, size_t size)
struct scatterlist *sg = NULL;
struct sg_table table;
struct page *page;
gfp_t gfp = __GFP_NOWARN | GFP_NOIO;
gfp_t gfp = __GFP_RECLAIMABLE | __GFP_NOWARN | GFP_NOIO;
int nr_pages = abd_chunkcnt_for_bytes(size);
int i = 0;
@@ -762,7 +762,7 @@ abd_init(void)
int i;
abd_cache = kmem_cache_create("abd_t", sizeof (abd_t),
0, NULL, NULL, NULL, NULL, NULL, 0);
0, NULL, NULL, NULL, NULL, NULL, KMC_RECLAIMABLE);
wmsum_init(&abd_sums.abdstat_struct_size, 0);
wmsum_init(&abd_sums.abdstat_linear_cnt, 0);
module/os/linux/zfs/zfs_znode.c
+2 -1
View File
@@ -194,7 +194,8 @@ zfs_znode_init(void)
ASSERT(znode_cache == NULL);
znode_cache = kmem_cache_create("zfs_znode_cache",
sizeof (znode_t), 0, zfs_znode_cache_constructor,
zfs_znode_cache_destructor, NULL, NULL, NULL, KMC_SLAB);
zfs_znode_cache_destructor, NULL, NULL, NULL,
KMC_SLAB | KMC_RECLAIMABLE);
ASSERT(znode_hold_cache == NULL);
znode_hold_cache = kmem_cache_create("zfs_znode_hold_cache",