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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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23
fs/xfs/libxfs/xfs_bmap_btree.c
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@@ -22,6 +22,8 @@
#include "xfs_trace.h"
#include "xfs_rmap.h"
static kmem_zone_t *xfs_bmbt_cur_cache;
/*
* Convert on-disk form of btree root to in-memory form.
*/
@@ -553,7 +555,7 @@ xfs_bmbt_init_cursor(
ASSERT(whichfork != XFS_COW_FORK);
cur = xfs_btree_alloc_cursor(mp, tp, XFS_BTNUM_BMAP,
mp->m_bm_maxlevels[whichfork]);
mp->m_bm_maxlevels[whichfork], xfs_bmbt_cur_cache);
cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_bmbt_2);
@@ -675,3 +677,22 @@ xfs_bmbt_calc_size(
{
return xfs_btree_calc_size(mp->m_bmap_dmnr, len);
}
int __init
xfs_bmbt_init_cur_cache(void)
{
xfs_bmbt_cur_cache = kmem_cache_create("xfs_bmbt_cur",
xfs_btree_cur_sizeof(xfs_bmbt_maxlevels_ondisk()),
0, 0, NULL);
if (!xfs_bmbt_cur_cache)
return -ENOMEM;
return 0;
}
void
xfs_bmbt_destroy_cur_cache(void)
{
kmem_cache_destroy(xfs_bmbt_cur_cache);
xfs_bmbt_cur_cache = NULL;
}