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xfs: use separate btree cursor cache for each btree type

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Now that we have the infrastructure to track the max possible height of
each btree type, we can create a separate slab cache for cursors of each
type of btree.  For smaller indices like the free space btrees, this
means that we can pack more cursors into a slab page, improving slab
utilization.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong
2021-09-23 12:21:37 -07:00
parent 0ed5f7356d
commit 9fa47bdcd3
13 changed files with 185 additions and 29 deletions
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20
fs/xfs/libxfs/xfs_btree.h
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@@ -13,8 +13,6 @@ struct xfs_trans;
struct xfs_ifork;
struct xfs_perag;
extern kmem_zone_t *xfs_btree_cur_zone;
/*
* Generic key, ptr and record wrapper structures.
*
@@ -92,12 +90,6 @@ uint32_t xfs_btree_magic(int crc, xfs_btnum_t btnum);
#define XFS_BTREE_STATS_ADD(cur, stat, val) \
XFS_STATS_ADD_OFF((cur)->bc_mp, (cur)->bc_statoff + __XBTS_ ## stat, val)
/*
* The btree cursor zone hands out cursors that can handle up to this many
* levels. This is the known maximum for all btree types.
*/
#define XFS_BTREE_CUR_CACHE_MAXLEVELS (9)
struct xfs_btree_ops {
/* size of the key and record structures */
size_t key_len;
@@ -238,6 +230,7 @@ struct xfs_btree_cur
struct xfs_trans *bc_tp; /* transaction we're in, if any */
struct xfs_mount *bc_mp; /* file system mount struct */
const struct xfs_btree_ops *bc_ops;
kmem_zone_t *bc_cache; /* cursor cache */
unsigned int bc_flags; /* btree features - below */
xfs_btnum_t bc_btnum; /* identifies which btree type */
union xfs_btree_irec bc_rec; /* current insert/search record value */
@@ -592,19 +585,22 @@ xfs_btree_alloc_cursor(
struct xfs_mount *mp,
struct xfs_trans *tp,
xfs_btnum_t btnum,
uint8_t maxlevels)
uint8_t maxlevels,
kmem_zone_t *cache)
{
struct xfs_btree_cur *cur;
ASSERT(maxlevels <= XFS_BTREE_CUR_CACHE_MAXLEVELS);
cur = kmem_cache_zalloc(xfs_btree_cur_zone, GFP_NOFS | __GFP_NOFAIL);
cur = kmem_cache_zalloc(cache, GFP_NOFS | __GFP_NOFAIL);
cur->bc_tp = tp;
cur->bc_mp = mp;
cur->bc_btnum = btnum;
cur->bc_maxlevels = maxlevels;
cur->bc_cache = cache;
return cur;
}
int __init xfs_btree_init_cur_caches(void);
void xfs_btree_destroy_cur_caches(void);
#endif /* __XFS_BTREE_H__ */