From: Jeff Mahoney <jeffm@xxxxxxxx>
This patch adds counters to each of the rbtrees so that we can tell
how large they are growing for a given workload. These counters
will be exported by tracepoints in the next patch.
Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx>
---
fs/btrfs/backref.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index ebe8875..5e5f8d7 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -136,9 +136,10 @@ struct prelim_ref {
struct preftree {
struct rb_root root;
+ unsigned int count;
};
-#define PREFTREE_INIT { .root = RB_ROOT }
+#define PREFTREE_INIT { .root = RB_ROOT, .count = 0 }
struct preftrees {
struct preftree direct; /* BTRFS_SHARED_[DATA|BLOCK]_REF_KEY */
@@ -248,6 +249,7 @@ static void prelim_ref_insert(struct preftree *preftree,
}
}
+ preftree->count++;
rb_link_node(&newref->rbnode, parent, p);
rb_insert_color(&newref->rbnode, root);
}
@@ -265,6 +267,7 @@ static void prelim_release(struct preftree *preftree)
free_pref(ref);
preftree->root = RB_ROOT;
+ preftree->count = 0;
}
/*
@@ -602,6 +605,7 @@ static int resolve_indirect_refs(struct btrfs_fs_info *fs_info,
}
rb_erase(&ref->rbnode, &preftrees->indirect.root);
+ preftrees->indirect.count--;
if (ref->count == 0) {
free_pref(ref);
--
2.10.2
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