[PATCH 028/111] xfs: consolidate btree block freeing tracepoints

Darrick J. Wong
2024-06-03T18:59:21Z

Source kernel commit: 78067b92b9096a70ca731a6cde1c286582ff03d7

Don't waste memory on extra per-btree block freeing tracepoints when we
can do it from the generic btree code.

With this patch applied, two tracepoints are collapsed into one
tracepoint, with the following effects on objdump -hx xfs.ko output:

Before:

10 __tracepoints_ptrs 00000b3c 0000000000000000 0000000000000000 00140eb0 2**2
14 __tracepoints_strings 00005453 0000000000000000 0000000000000000 00168540 2**5
29 __tracepoints 00010d90 0000000000000000 0000000000000000 0023f5e0 2**5

After:

10 __tracepoints_ptrs 00000b38 0000000000000000 0000000000000000 001412f0 2**2
14 __tracepoints_strings 00005433 0000000000000000 0000000000000000 001689a0 2**5
29 __tracepoints 00010d30 0000000000000000 0000000000000000 0023fe00 2**5

Column 3 is the section size in bytes; removing these two tracepoints
reduces the size of the ELF segments by 132 bytes.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
---
include/xfs_trace.h | 3 +--
libxfs/xfs_btree.c | 2 ++
libxfs/xfs_refcount_btree.c | 2 --
libxfs/xfs_rmap_btree.c | 2 --
4 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/include/xfs_trace.h b/include/xfs_trace.h
index f172b61d6..98819653b 100644
--- a/include/xfs_trace.h
+++ b/include/xfs_trace.h
@@ -68,6 +68,7 @@
#define trace_xfs_btree_commit_ifakeroot(a) ((void) 0)
#define trace_xfs_btree_bload_level_geometry(a,b,c,d,e,f,g) ((void) 0)
#define trace_xfs_btree_bload_block(a,b,c,d,e,f) ((void) 0)
+#define trace_xfs_btree_free_block(...) ((void) 0)

#define trace_xfs_free_extent(a,b,c,d,e,f,g) ((void) 0)
#define trace_xfs_agf(a,b,c,d) ((void) 0)
@@ -256,7 +257,6 @@
#define trace_xfs_rmap_find_left_neighbor_result(...) ((void) 0)
#define trace_xfs_rmap_lookup_le_range_result(...) ((void) 0)

-#define trace_xfs_rmapbt_free_block(...) ((void) 0)
#define trace_xfs_rmapbt_alloc_block(...) ((void) 0)

#define trace_xfs_ag_resv_critical(...) ((void) 0)
@@ -276,7 +276,6 @@
#define trace_xfs_refcount_insert_error(...) ((void) 0)
#define trace_xfs_refcount_delete(...) ((void) 0)
#define trace_xfs_refcount_delete_error(...) ((void) 0)
-#define trace_xfs_refcountbt_free_block(...) ((void) 0)
#define trace_xfs_refcountbt_alloc_block(...) ((void) 0)
#define trace_xfs_refcount_rec_order_error(...) ((void) 0)

diff --git a/libxfs/xfs_btree.c b/libxfs/xfs_btree.c
index b9af447ab..fb36a3b69 100644
--- a/libxfs/xfs_btree.c
+++ b/libxfs/xfs_btree.c
@@ -411,6 +411,8 @@ xfs_btree_free_block(
{
int error;

+ trace_xfs_btree_free_block(cur, bp);
+
error = cur->bc_ops->free_block(cur, bp);
if (!error) {
xfs_trans_binval(cur->bc_tp, bp);
diff --git a/libxfs/xfs_refcount_btree.c b/libxfs/xfs_refcount_btree.c
index ac1c3ab86..67551df02 100644
--- a/libxfs/xfs_refcount_btree.c
+++ b/libxfs/xfs_refcount_btree.c
@@ -106,8 +106,6 @@ xfs_refcountbt_free_block(
struct xfs_agf *agf = agbp->b_addr;
xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, xfs_buf_daddr(bp));

- trace_xfs_refcountbt_free_block(cur->bc_mp, cur->bc_ag.pag->pag_agno,
- XFS_FSB_TO_AGBNO(cur->bc_mp, fsbno), 1);
be32_add_cpu(&agf->agf_refcount_blocks, -1);
xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS);
return xfs_free_extent_later(cur->bc_tp, fsbno, 1,
diff --git a/libxfs/xfs_rmap_btree.c b/libxfs/xfs_rmap_btree.c
index d6e2fc0a3..7966a3e6a 100644
--- a/libxfs/xfs_rmap_btree.c
+++ b/libxfs/xfs_rmap_btree.c
@@ -123,8 +123,6 @@ xfs_rmapbt_free_block(
int error;

bno = xfs_daddr_to_agbno(cur->bc_mp, xfs_buf_daddr(bp));
- trace_xfs_rmapbt_free_block(cur->bc_mp, pag->pag_agno,
- bno, 1);
be32_add_cpu(&agf->agf_rmap_blocks, -1);
xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_RMAP_BLOCKS);
error = xfs_alloc_put_freelist(pag, cur->bc_tp, agbp, NULL, bno, 1);