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Btrfs: optimize key searches in btrfs_search_slot 

When the binary search returns 0 (exact match), the target key
will necessarily be at slot 0 of all nodes below the current one,
so in this case the binary search is not needed because it will
always return 0, and we waste time doing it, holding node locks
for longer than necessary, etc.

Below follow histograms with the times spent on the current approach of
doing a binary search when the previous binary search returned 0, and
times for the new approach, which directly picks the first item/child
node in the leaf/node.

Current approach:

Count: 6682
Range: 35.000 - 8370.000; Mean: 85.837; Median: 75.000; Stddev: 106.429
Percentiles:  90th: 124.000; 95th: 145.000; 99th: 206.000
  35.000 -   61.080:  1235 ################
  61.080 -  106.053:  4207 #####################################################
 106.053 -  183.606:  1122 ##############
 183.606 -  317.341:   111 #
 317.341 -  547.959:     6 |
 547.959 - 8370.000:     1 |

Approach proposed by this patch:

Count: 6682
Range:  6.000 - 135.000; Mean: 16.690; Median: 16.000; Stddev:  7.160
Percentiles:  90th: 23.000; 95th: 27.000; 99th: 40.000
   6.000 -    8.418:    58 #
   8.418 -   11.670:  1149 #########################
  11.670 -   16.046:  2418 #####################################################
  16.046 -   21.934:  2098 ##############################################
  21.934 -   29.854:   744 ################
  29.854 -   40.511:   154 ###
  40.511 -   54.848:    41 #
  54.848 -   74.136:     5 |
  74.136 -  100.087:     9 |
 100.087 -  135.000:     6 |

These samples were captured during a run of the btrfs tests 001, 002 and
004 in the xfstests, with a leaf/node size of 4Kb.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Filipe David Borba Manana 2013-08-30 15:46:43 +01:00 committed by Chris Mason
parent 45d5fd14d2
commit d7396f0735
1 changed files with 40 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
fs/btrfs/ctree.c
View File

@ -2426,6 +2426,40 @@ setup_nodes_for_search(struct btrfs_trans_handle *trans,
return ret;
}
static void key_search_validate(struct extent_buffer *b,
struct btrfs_key *key,
int level)
{
#ifdef CONFIG_BTRFS_ASSERT
struct btrfs_disk_key disk_key;
btrfs_cpu_key_to_disk(&disk_key, key);
if (level == 0)
ASSERT(!memcmp_extent_buffer(b, &disk_key,
offsetof(struct btrfs_leaf, items[0].key),
sizeof(disk_key)));
else
ASSERT(!memcmp_extent_buffer(b, &disk_key,
offsetof(struct btrfs_node, ptrs[0].key),
sizeof(disk_key)));
#endif
}
static int key_search(struct extent_buffer *b, struct btrfs_key *key,
int level, int *prev_cmp, int *slot)
{
if (*prev_cmp != 0) {
*prev_cmp = bin_search(b, key, level, slot);
return *prev_cmp;
}
key_search_validate(b, key, level);
*slot = 0;
return 0;
}
/*
* look for key in the tree. path is filled in with nodes along the way
* if key is found, we return zero and you can find the item in the leaf
@ -2454,6 +2488,7 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
int write_lock_level = 0;
u8 lowest_level = 0;
int min_write_lock_level;
int prev_cmp;
lowest_level = p->lowest_level;
WARN_ON(lowest_level && ins_len > 0);
@ -2484,6 +2519,7 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
min_write_lock_level = write_lock_level;
again:
prev_cmp = -1;
/*
* we try very hard to do read locks on the root
*/
@ -2584,7 +2620,7 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
if (!cow)
btrfs_unlock_up_safe(p, level + 1);
ret = bin_search(b, key, level, &slot);
ret = key_search(b, key, level, &prev_cmp, &slot);
if (level != 0) {
int dec = 0;
@ -2719,6 +2755,7 @@ int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
int level;
int lowest_unlock = 1;
u8 lowest_level = 0;
int prev_cmp;
lowest_level = p->lowest_level;
WARN_ON(p->nodes[0] != NULL);
@ -2729,6 +2766,7 @@ int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
}
again:
prev_cmp = -1;
b = get_old_root(root, time_seq);
level = btrfs_header_level(b);
p->locks[level] = BTRFS_READ_LOCK;
@ -2746,7 +2784,7 @@ int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
*/
btrfs_unlock_up_safe(p, level + 1);
ret = bin_search(b, key, level, &slot);
ret = key_search(b, key, level, &prev_cmp, &slot);
if (level != 0) {
int dec = 0;