mirror of
https://github.com/torvalds/linux.git
synced 2024-12-28 13:51:44 +00:00
[JFFS2] Optimise jffs2_add_tn_to_list
Use an rbtree instead of a simple linked list. We were wasting an amazing amount of time in jffs2_add_tn_to_list(). Thanks to Artem Bityuckiy and Jarkko Jlavinen for noticing. Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
David Woodhouse
Thomas Gleixner
parent
10c96f2ec3
commit
9dee7503ce
@ -7,7 +7,7 @@
|
||||
*
|
||||
* For licensing information, see the file 'LICENCE' in this directory.
|
||||
*
|
||||
* $Id: nodelist.c,v 1.94 2005/04/13 13:22:35 dwmw2 Exp $
|
||||
* $Id: nodelist.c,v 1.95 2005/07/05 21:03:07 dwmw2 Exp $
|
||||
*
|
||||
*/
|
||||
|
||||
@ -58,27 +58,61 @@ void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new
|
||||
/* Put a new tmp_dnode_info into the list, keeping the list in
|
||||
order of increasing version
|
||||
*/
|
||||
static void jffs2_add_tn_to_list(struct jffs2_tmp_dnode_info *tn, struct jffs2_tmp_dnode_info **list)
|
||||
|
||||
static void jffs2_add_tn_to_list(struct jffs2_tmp_dnode_info *tn, struct rb_root *list)
|
||||
{
|
||||
struct jffs2_tmp_dnode_info **prev = list;
|
||||
|
||||
while ((*prev) && (*prev)->version < tn->version) {
|
||||
prev = &((*prev)->next);
|
||||
}
|
||||
tn->next = (*prev);
|
||||
*prev = tn;
|
||||
struct rb_node **p = &list->rb_node;
|
||||
struct rb_node * parent = NULL;
|
||||
struct jffs2_tmp_dnode_info *this;
|
||||
|
||||
while (*p) {
|
||||
parent = *p;
|
||||
this = rb_entry(parent, struct jffs2_tmp_dnode_info, rb);
|
||||
|
||||
if (tn->version < this->version)
|
||||
p = &(*p)->rb_left;
|
||||
else if (tn->version > this->version)
|
||||
p = &(*p)->rb_right;
|
||||
else if (tn < this)
|
||||
p = &(*p)->rb_left;
|
||||
else
|
||||
p = &(*p)->rb_right;
|
||||
}
|
||||
|
||||
rb_link_node(&tn->rb, parent, p);
|
||||
rb_insert_color(&tn->rb, list);
|
||||
}
|
||||
|
||||
static void jffs2_free_tmp_dnode_info_list(struct jffs2_tmp_dnode_info *tn)
|
||||
static void jffs2_free_tmp_dnode_info_list(struct rb_root *list)
|
||||
{
|
||||
struct jffs2_tmp_dnode_info *next;
|
||||
struct rb_node *this;
|
||||
struct jffs2_tmp_dnode_info *tn;
|
||||
|
||||
while (tn) {
|
||||
next = tn;
|
||||
tn = tn->next;
|
||||
jffs2_free_full_dnode(next->fn);
|
||||
jffs2_free_tmp_dnode_info(next);
|
||||
this = list->rb_node;
|
||||
|
||||
/* Now at bottom of tree */
|
||||
while (this) {
|
||||
if (this->rb_left)
|
||||
this = this->rb_left;
|
||||
else if (this->rb_right)
|
||||
this = this->rb_right;
|
||||
else {
|
||||
tn = rb_entry(this, struct jffs2_tmp_dnode_info, rb);
|
||||
jffs2_free_full_dnode(tn->fn);
|
||||
jffs2_free_tmp_dnode_info(tn);
|
||||
|
||||
this = this->rb_parent;
|
||||
if (!this)
|
||||
break;
|
||||
|
||||
if (this->rb_left == &tn->rb)
|
||||
this->rb_left = NULL;
|
||||
else if (this->rb_right == &tn->rb)
|
||||
this->rb_right = NULL;
|
||||
else BUG();
|
||||
}
|
||||
}
|
||||
list->rb_node = NULL;
|
||||
}
|
||||
|
||||
static void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd)
|
||||
@ -108,12 +142,13 @@ static struct jffs2_raw_node_ref *jffs2_first_valid_node(struct jffs2_raw_node_r
|
||||
with this ino, returning the former in order of version */
|
||||
|
||||
int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
|
||||
struct jffs2_tmp_dnode_info **tnp, struct jffs2_full_dirent **fdp,
|
||||
struct rb_root *tnp, struct jffs2_full_dirent **fdp,
|
||||
uint32_t *highest_version, uint32_t *latest_mctime,
|
||||
uint32_t *mctime_ver)
|
||||
{
|
||||
struct jffs2_raw_node_ref *ref, *valid_ref;
|
||||
struct jffs2_tmp_dnode_info *tn, *ret_tn = NULL;
|
||||
struct jffs2_tmp_dnode_info *tn;
|
||||
struct rb_root ret_tn = RB_ROOT;
|
||||
struct jffs2_full_dirent *fd, *ret_fd = NULL;
|
||||
union jffs2_node_union node;
|
||||
size_t retlen;
|
||||
@ -450,7 +485,7 @@ int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
|
||||
return 0;
|
||||
|
||||
free_out:
|
||||
jffs2_free_tmp_dnode_info_list(ret_tn);
|
||||
jffs2_free_tmp_dnode_info_list(&ret_tn);
|
||||
jffs2_free_full_dirent_list(ret_fd);
|
||||
return err;
|
||||
}
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
*
|
||||
* For licensing information, see the file 'LICENCE' in this directory.
|
||||
*
|
||||
* $Id: nodelist.h,v 1.130 2005/04/09 10:46:59 dedekind Exp $
|
||||
* $Id: nodelist.h,v 1.131 2005/07/05 21:03:07 dwmw2 Exp $
|
||||
*
|
||||
*/
|
||||
|
||||
@ -161,7 +161,7 @@ struct jffs2_full_dnode
|
||||
*/
|
||||
struct jffs2_tmp_dnode_info
|
||||
{
|
||||
struct jffs2_tmp_dnode_info *next;
|
||||
struct rb_node rb;
|
||||
struct jffs2_full_dnode *fn;
|
||||
uint32_t version;
|
||||
};
|
||||
@ -387,7 +387,7 @@ static inline struct jffs2_node_frag *frag_last(struct rb_root *root)
|
||||
D2(void jffs2_print_frag_list(struct jffs2_inode_info *f));
|
||||
void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list);
|
||||
int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
|
||||
struct jffs2_tmp_dnode_info **tnp, struct jffs2_full_dirent **fdp,
|
||||
struct rb_root *tnp, struct jffs2_full_dirent **fdp,
|
||||
uint32_t *highest_version, uint32_t *latest_mctime,
|
||||
uint32_t *mctime_ver);
|
||||
void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state);
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
*
|
||||
* For licensing information, see the file 'LICENCE' in this directory.
|
||||
*
|
||||
* $Id: readinode.c,v 1.119 2005/03/01 10:34:03 dedekind Exp $
|
||||
* $Id: readinode.c,v 1.120 2005/07/05 21:03:07 dwmw2 Exp $
|
||||
*
|
||||
*/
|
||||
|
||||
@ -500,7 +500,9 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,
|
||||
struct jffs2_inode_info *f,
|
||||
struct jffs2_raw_inode *latest_node)
|
||||
{
|
||||
struct jffs2_tmp_dnode_info *tn_list, *tn;
|
||||
struct jffs2_tmp_dnode_info *tn = NULL;
|
||||
struct rb_root tn_list;
|
||||
struct rb_node *rb, *repl_rb;
|
||||
struct jffs2_full_dirent *fd_list;
|
||||
struct jffs2_full_dnode *fn = NULL;
|
||||
uint32_t crc;
|
||||
@ -522,9 +524,10 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,
|
||||
}
|
||||
f->dents = fd_list;
|
||||
|
||||
while (tn_list) {
|
||||
tn = tn_list;
|
||||
rb = rb_first(&tn_list);
|
||||
|
||||
while (rb) {
|
||||
tn = rb_entry(rb, struct jffs2_tmp_dnode_info, rb);
|
||||
fn = tn->fn;
|
||||
|
||||
if (f->metadata) {
|
||||
@ -556,7 +559,30 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,
|
||||
mdata_ver = tn->version;
|
||||
}
|
||||
next_tn:
|
||||
tn_list = tn->next;
|
||||
BUG_ON(rb->rb_left);
|
||||
repl_rb = NULL;
|
||||
if (rb->rb_parent && rb->rb_parent->rb_left == rb) {
|
||||
/* We were then left-hand child of our parent. We need
|
||||
to move our own right-hand child into our place. */
|
||||
repl_rb = rb->rb_right;
|
||||
if (repl_rb)
|
||||
repl_rb->rb_parent = rb->rb_parent;
|
||||
} else
|
||||
repl_rb = NULL;
|
||||
|
||||
rb = rb_next(rb);
|
||||
|
||||
/* Remove the spent tn from the tree; don't bother rebalancing
|
||||
but put our right-hand child in our own place. */
|
||||
if (tn->rb.rb_parent) {
|
||||
if (tn->rb.rb_parent->rb_left == &tn->rb)
|
||||
tn->rb.rb_parent->rb_left = repl_rb;
|
||||
else if (tn->rb.rb_parent->rb_right == &tn->rb)
|
||||
tn->rb.rb_parent->rb_right = repl_rb;
|
||||
else BUG();
|
||||
} else if (tn->rb.rb_right)
|
||||
tn->rb.rb_right->rb_parent = NULL;
|
||||
|
||||
jffs2_free_tmp_dnode_info(tn);
|
||||
}
|
||||
D1(jffs2_sanitycheck_fragtree(f));
|
||||
|
||||
Loading…
Reference in New Issue
Block a user