[PATCH] f2fs: use rb_*_cached friends

From: Chao Yu
Date: Sat Sep 29 2018 - 09:29:28 EST

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From: Chao Yu <yuchao0@xxxxxxxxxx>

As rbtree supports caching leftmost node natively, update f2fs codes
to use rb_*_cached helpers to speed up leftmost node visiting.

Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
---
fs/f2fs/extent_cache.c | 52 +++++++++++++++++++++++-------------------
fs/f2fs/f2fs.h | 15 ++++++------
fs/f2fs/segment.c | 16 ++++++++-----
3 files changed, 47 insertions(+), 36 deletions(-)

diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index 904ad7ba5a45..61b05d86a0ac 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -27,10 +27,10 @@ static struct rb_entry *__lookup_rb_tree_fast(struct rb_entry *cached_re,
return NULL;
}

-static struct rb_entry *__lookup_rb_tree_slow(struct rb_root *root,
+static struct rb_entry *__lookup_rb_tree_slow(struct rb_root_cached *root,
unsigned int ofs)
{
- struct rb_node *node = root->rb_node;
+ struct rb_node *node = root->rb_root.rb_node;
struct rb_entry *re;

while (node) {
@@ -46,7 +46,7 @@ static struct rb_entry *__lookup_rb_tree_slow(struct rb_root *root,
return NULL;
}

-struct rb_entry *f2fs_lookup_rb_tree(struct rb_root *root,
+struct rb_entry *f2fs_lookup_rb_tree(struct rb_root_cached *root,
struct rb_entry *cached_re, unsigned int ofs)
{
struct rb_entry *re;
@@ -59,22 +59,25 @@ struct rb_entry *f2fs_lookup_rb_tree(struct rb_root *root,
}

struct rb_node **f2fs_lookup_rb_tree_for_insert(struct f2fs_sb_info *sbi,
- struct rb_root *root, struct rb_node **parent,
- unsigned int ofs)
+ struct rb_root_cached *root,
+ struct rb_node **parent,
+ unsigned int ofs, bool *leftmost)
{
- struct rb_node **p = &root->rb_node;
+ struct rb_node **p = &root->rb_root.rb_node;
struct rb_entry *re;

while (*p) {
*parent = *p;
re = rb_entry(*parent, struct rb_entry, rb_node);

- if (ofs < re->ofs)
+ if (ofs < re->ofs) {
p = &(*p)->rb_left;
- else if (ofs >= re->ofs + re->len)
+ } else if (ofs >= re->ofs + re->len) {
p = &(*p)->rb_right;
- else
+ *leftmost = false;
+ } else {
f2fs_bug_on(sbi, 1);
+ }
}

return p;
@@ -89,7 +92,7 @@ struct rb_node **f2fs_lookup_rb_tree_for_insert(struct f2fs_sb_info *sbi,
* in order to simpfy the insertion after.
* tree must stay unchanged between lookup and insertion.
*/
-struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root *root,
+struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root_cached *root,
struct rb_entry *cached_re,
unsigned int ofs,
struct rb_entry **prev_entry,
@@ -98,7 +101,7 @@ struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root *root,
struct rb_node **insert_parent,
bool force)
{
- struct rb_node **pnode = &root->rb_node;
+ struct rb_node **pnode = &root->rb_root.rb_node;
struct rb_node *parent = NULL, *tmp_node;
struct rb_entry *re = cached_re;

@@ -107,7 +110,7 @@ struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root *root,
*prev_entry = NULL;
*next_entry = NULL;

- if (RB_EMPTY_ROOT(root))
+ if (RB_EMPTY_ROOT(&root->rb_root))
return NULL;

if (re) {
@@ -157,10 +160,10 @@ struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root *root,
}

bool f2fs_check_rb_tree_consistence(struct f2fs_sb_info *sbi,
- struct rb_root *root)
+ struct rb_root_cached *root)
{
#ifdef CONFIG_F2FS_CHECK_FS
- struct rb_node *cur = rb_first(root), *next;
+ struct rb_node *cur = rb_first_cached(root), *next;
struct rb_entry *cur_re, *next_re;

if (!cur)
@@ -193,7 +196,8 @@ static struct kmem_cache *extent_node_slab;

static struct extent_node *__attach_extent_node(struct f2fs_sb_info *sbi,
struct extent_tree *et, struct extent_info *ei,
- struct rb_node *parent, struct rb_node **p)
+ struct rb_node *parent, struct rb_node **p,
+ bool leftmost)
{
struct extent_node *en;

@@ -206,7 +210,7 @@ static struct extent_node *__attach_extent_node(struct f2fs_sb_info *sbi,
en->et = et;

rb_link_node(&en->rb_node, parent, p);
- rb_insert_color(&en->rb_node, &et->root);
+ rb_insert_color_cached(&en->rb_node, &et->root, leftmost);
atomic_inc(&et->node_cnt);
atomic_inc(&sbi->total_ext_node);
return en;
@@ -215,7 +219,7 @@ static struct extent_node *__attach_extent_node(struct f2fs_sb_info *sbi,
static void __detach_extent_node(struct f2fs_sb_info *sbi,
struct extent_tree *et, struct extent_node *en)
{
- rb_erase(&en->rb_node, &et->root);
+ rb_erase_cached(&en->rb_node, &et->root);
atomic_dec(&et->node_cnt);
atomic_dec(&sbi->total_ext_node);

@@ -254,7 +258,7 @@ static struct extent_tree *__grab_extent_tree(struct inode *inode)
f2fs_radix_tree_insert(&sbi->extent_tree_root, ino, et);
memset(et, 0, sizeof(struct extent_tree));
et->ino = ino;
- et->root = RB_ROOT;
+ et->root = RB_ROOT_CACHED;
et->cached_en = NULL;
rwlock_init(&et->lock);
INIT_LIST_HEAD(&et->list);
@@ -275,10 +279,10 @@ static struct extent_tree *__grab_extent_tree(struct inode *inode)
static struct extent_node *__init_extent_tree(struct f2fs_sb_info *sbi,
struct extent_tree *et, struct extent_info *ei)
{
- struct rb_node **p = &et->root.rb_node;
+ struct rb_node **p = &et->root.rb_root.rb_node;
struct extent_node *en;

- en = __attach_extent_node(sbi, et, ei, NULL, p);
+ en = __attach_extent_node(sbi, et, ei, NULL, p, true);
if (!en)
return NULL;

@@ -294,7 +298,7 @@ static unsigned int __free_extent_tree(struct f2fs_sb_info *sbi,
struct extent_node *en;
unsigned int count = atomic_read(&et->node_cnt);

- node = rb_first(&et->root);
+ node = rb_first_cached(&et->root);
while (node) {
next = rb_next(node);
en = rb_entry(node, struct extent_node, rb_node);
@@ -457,6 +461,7 @@ static struct extent_node *__insert_extent_tree(struct f2fs_sb_info *sbi,
struct rb_node **p;
struct rb_node *parent = NULL;
struct extent_node *en = NULL;
+ bool leftmost = true;

if (insert_p && insert_parent) {
parent = insert_parent;
@@ -464,9 +469,10 @@ static struct extent_node *__insert_extent_tree(struct f2fs_sb_info *sbi,
goto do_insert;
}

- p = f2fs_lookup_rb_tree_for_insert(sbi, &et->root, &parent, ei->fofs);
+ p = f2fs_lookup_rb_tree_for_insert(sbi, &et->root, &parent,
+ ei->fofs, &leftmost);
do_insert:
- en = __attach_extent_node(sbi, et, ei, parent, p);
+ en = __attach_extent_node(sbi, et, ei, parent, p, leftmost);
if (!en)
return NULL;

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 807a2e34543c..35ff557915af 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -324,7 +324,7 @@ struct discard_cmd_control {
atomic_t issued_discard; /* # of issued discard */
atomic_t issing_discard; /* # of issing discard */
atomic_t discard_cmd_cnt; /* # of cached cmd count */
- struct rb_root root; /* root of discard rb-tree */
+ struct rb_root_cached root; /* root of discard rb-tree */
bool rbtree_check; /* config for consistence check */
};

@@ -569,7 +569,7 @@ struct extent_node {

struct extent_tree {
nid_t ino; /* inode number */
- struct rb_root root; /* root of extent info rb-tree */
+ struct rb_root_cached root; /* root of extent info rb-tree */
struct extent_node *cached_en; /* recently accessed extent node */
struct extent_info largest; /* largested extent info */
struct list_head list; /* to be used by sbi->zombie_list */
@@ -3375,18 +3375,19 @@ void f2fs_leave_shrinker(struct f2fs_sb_info *sbi);
/*
* extent_cache.c
*/
-struct rb_entry *f2fs_lookup_rb_tree(struct rb_root *root,
+struct rb_entry *f2fs_lookup_rb_tree(struct rb_root_cached *root,
struct rb_entry *cached_re, unsigned int ofs);
struct rb_node **f2fs_lookup_rb_tree_for_insert(struct f2fs_sb_info *sbi,
- struct rb_root *root, struct rb_node **parent,
- unsigned int ofs);
-struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root *root,
+ struct rb_root_cached *root,
+ struct rb_node **parent,
+ unsigned int ofs, bool *leftmost);
+struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root_cached *root,
struct rb_entry *cached_re, unsigned int ofs,
struct rb_entry **prev_entry, struct rb_entry **next_entry,
struct rb_node ***insert_p, struct rb_node **insert_parent,
bool force);
bool f2fs_check_rb_tree_consistence(struct f2fs_sb_info *sbi,
- struct rb_root *root);
+ struct rb_root_cached *root);
unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink);
bool f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext);
void f2fs_drop_extent_tree(struct inode *inode);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index e16dae0f0a5b..4177a226601b 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -853,7 +853,8 @@ static struct discard_cmd *__create_discard_cmd(struct f2fs_sb_info *sbi,
static struct discard_cmd *__attach_discard_cmd(struct f2fs_sb_info *sbi,
struct block_device *bdev, block_t lstart,
block_t start, block_t len,
- struct rb_node *parent, struct rb_node **p)
+ struct rb_node *parent, struct rb_node **p,
+ bool leftmost)
{
struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
struct discard_cmd *dc;
@@ -861,7 +862,7 @@ static struct discard_cmd *__attach_discard_cmd(struct f2fs_sb_info *sbi,
dc = __create_discard_cmd(sbi, bdev, lstart, start, len);

rb_link_node(&dc->rb_node, parent, p);
- rb_insert_color(&dc->rb_node, &dcc->root);
+ rb_insert_color_cached(&dc->rb_node, &dcc->root, leftmost);

return dc;
}
@@ -873,7 +874,7 @@ static void __detach_discard_cmd(struct discard_cmd_control *dcc,
atomic_sub(dc->issuing, &dcc->issing_discard);

list_del(&dc->list);
- rb_erase(&dc->rb_node, &dcc->root);
+ rb_erase_cached(&dc->rb_node, &dcc->root);
dcc->undiscard_blks -= dc->len;

kmem_cache_free(discard_cmd_slab, dc);
@@ -1110,6 +1111,7 @@ static struct discard_cmd *__insert_discard_tree(struct f2fs_sb_info *sbi,
struct rb_node **p;
struct rb_node *parent = NULL;
struct discard_cmd *dc = NULL;
+ bool leftmost = true;

if (insert_p && insert_parent) {
parent = insert_parent;
@@ -1117,9 +1119,11 @@ static struct discard_cmd *__insert_discard_tree(struct f2fs_sb_info *sbi,
goto do_insert;
}

- p = f2fs_lookup_rb_tree_for_insert(sbi, &dcc->root, &parent, lstart);
+ p = f2fs_lookup_rb_tree_for_insert(sbi, &dcc->root, &parent,
+ lstart, &leftmost);
do_insert:
- dc = __attach_discard_cmd(sbi, bdev, lstart, start, len, parent, p);
+ dc = __attach_discard_cmd(sbi, bdev, lstart, start, len, parent,
+ p, leftmost);
if (!dc)
return NULL;

@@ -1927,7 +1931,7 @@ static int create_discard_cmd_control(struct f2fs_sb_info *sbi)
dcc->max_discards = MAIN_SEGS(sbi) << sbi->log_blocks_per_seg;
dcc->undiscard_blks = 0;
dcc->next_pos = 0;
- dcc->root = RB_ROOT;
+ dcc->root = RB_ROOT_CACHED;
dcc->rbtree_check = false;

init_waitqueue_head(&dcc->discard_wait_queue);
--
2.18.0

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