From cfed81a04eb555f5606d1b6a54bdbabab0ee1ac3 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Sat, 3 Mar 2012 07:40:03 -0500 Subject: [PATCH] Btrfs: add the ability to cache a pointer into the eb This cuts down on the CPU time used by map_private_extent_buffer Signed-off-by: Chris Mason --- fs/btrfs/ctree.c | 80 +++++++++++++++++++++++++++++------------ fs/btrfs/ctree.h | 13 +++++++ fs/btrfs/struct-funcs.c | 53 +++++++++++++++++++++++---- 3 files changed, 116 insertions(+), 30 deletions(-) diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 74c03fb0ca1..8af24da983b 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -2333,6 +2333,7 @@ static noinline int __push_leaf_right(struct btrfs_trans_handle *trans, { struct extent_buffer *left = path->nodes[0]; struct extent_buffer *upper = path->nodes[1]; + struct btrfs_map_token token; struct btrfs_disk_key disk_key; int slot; u32 i; @@ -2344,6 +2345,8 @@ static noinline int __push_leaf_right(struct btrfs_trans_handle *trans, u32 data_end; u32 this_item_size; + btrfs_init_map_token(&token); + if (empty) nr = 0; else @@ -2421,8 +2424,8 @@ static noinline int __push_leaf_right(struct btrfs_trans_handle *trans, push_space = BTRFS_LEAF_DATA_SIZE(root); for (i = 0; i < right_nritems; i++) { item = btrfs_item_nr(right, i); - push_space -= btrfs_item_size(right, item); - btrfs_set_item_offset(right, item, push_space); + push_space -= btrfs_token_item_size(right, item, &token); + btrfs_set_token_item_offset(right, item, push_space, &token); } left_nritems -= push_items; @@ -2553,6 +2556,9 @@ static noinline int __push_leaf_left(struct btrfs_trans_handle *trans, int wret; u32 this_item_size; u32 old_left_item_size; + struct btrfs_map_token token; + + btrfs_init_map_token(&token); if (empty) nr = min(right_nritems, max_slot); @@ -2613,9 +2619,10 @@ static noinline int __push_leaf_left(struct btrfs_trans_handle *trans, item = btrfs_item_nr(left, i); - ioff = btrfs_item_offset(left, item); - btrfs_set_item_offset(left, item, - ioff - (BTRFS_LEAF_DATA_SIZE(root) - old_left_item_size)); + ioff = btrfs_token_item_offset(left, item, &token); + btrfs_set_token_item_offset(left, item, + ioff - (BTRFS_LEAF_DATA_SIZE(root) - old_left_item_size), + &token); } btrfs_set_header_nritems(left, old_left_nritems + push_items); @@ -2645,8 +2652,9 @@ static noinline int __push_leaf_left(struct btrfs_trans_handle *trans, for (i = 0; i < right_nritems; i++) { item = btrfs_item_nr(right, i); - push_space = push_space - btrfs_item_size(right, item); - btrfs_set_item_offset(right, item, push_space); + push_space = push_space - btrfs_token_item_size(right, + item, &token); + btrfs_set_token_item_offset(right, item, push_space, &token); } btrfs_mark_buffer_dirty(left); @@ -2767,6 +2775,9 @@ static noinline int copy_for_split(struct btrfs_trans_handle *trans, int ret = 0; int wret; struct btrfs_disk_key disk_key; + struct btrfs_map_token token; + + btrfs_init_map_token(&token); nritems = nritems - mid; btrfs_set_header_nritems(right, nritems); @@ -2788,8 +2799,9 @@ static noinline int copy_for_split(struct btrfs_trans_handle *trans, struct btrfs_item *item = btrfs_item_nr(right, i); u32 ioff; - ioff = btrfs_item_offset(right, item); - btrfs_set_item_offset(right, item, ioff + rt_data_off); + ioff = btrfs_token_item_offset(right, item, &token); + btrfs_set_token_item_offset(right, item, + ioff + rt_data_off, &token); } btrfs_set_header_nritems(l, mid); @@ -3284,6 +3296,9 @@ int btrfs_truncate_item(struct btrfs_trans_handle *trans, unsigned int old_size; unsigned int size_diff; int i; + struct btrfs_map_token token; + + btrfs_init_map_token(&token); leaf = path->nodes[0]; slot = path->slots[0]; @@ -3310,8 +3325,9 @@ int btrfs_truncate_item(struct btrfs_trans_handle *trans, u32 ioff; item = btrfs_item_nr(leaf, i); - ioff = btrfs_item_offset(leaf, item); - btrfs_set_item_offset(leaf, item, ioff + size_diff); + ioff = btrfs_token_item_offset(leaf, item, &token); + btrfs_set_token_item_offset(leaf, item, + ioff + size_diff, &token); } /* shift the data */ @@ -3381,6 +3397,9 @@ int btrfs_extend_item(struct btrfs_trans_handle *trans, unsigned int old_data; unsigned int old_size; int i; + struct btrfs_map_token token; + + btrfs_init_map_token(&token); leaf = path->nodes[0]; @@ -3410,8 +3429,9 @@ int btrfs_extend_item(struct btrfs_trans_handle *trans, u32 ioff; item = btrfs_item_nr(leaf, i); - ioff = btrfs_item_offset(leaf, item); - btrfs_set_item_offset(leaf, item, ioff - data_size); + ioff = btrfs_token_item_offset(leaf, item, &token); + btrfs_set_token_item_offset(leaf, item, + ioff - data_size, &token); } /* shift the data */ @@ -3454,6 +3474,9 @@ int btrfs_insert_some_items(struct btrfs_trans_handle *trans, unsigned int data_end; struct btrfs_disk_key disk_key; struct btrfs_key found_key; + struct btrfs_map_token token; + + btrfs_init_map_token(&token); for (i = 0; i < nr; i++) { if (total_size + data_size[i] + sizeof(struct btrfs_item) > @@ -3519,8 +3542,9 @@ int btrfs_insert_some_items(struct btrfs_trans_handle *trans, u32 ioff; item = btrfs_item_nr(leaf, i); - ioff = btrfs_item_offset(leaf, item); - btrfs_set_item_offset(leaf, item, ioff - total_data); + ioff = btrfs_token_item_offset(leaf, item, &token); + btrfs_set_token_item_offset(leaf, item, + ioff - total_data, &token); } /* shift the items */ memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot + nr), @@ -3547,9 +3571,10 @@ int btrfs_insert_some_items(struct btrfs_trans_handle *trans, btrfs_cpu_key_to_disk(&disk_key, cpu_key + i); btrfs_set_item_key(leaf, &disk_key, slot + i); item = btrfs_item_nr(leaf, slot + i); - btrfs_set_item_offset(leaf, item, data_end - data_size[i]); + btrfs_set_token_item_offset(leaf, item, + data_end - data_size[i], &token); data_end -= data_size[i]; - btrfs_set_item_size(leaf, item, data_size[i]); + btrfs_set_token_item_size(leaf, item, data_size[i], &token); } btrfs_set_header_nritems(leaf, nritems + nr); btrfs_mark_buffer_dirty(leaf); @@ -3588,6 +3613,9 @@ int setup_items_for_insert(struct btrfs_trans_handle *trans, int ret; struct extent_buffer *leaf; int slot; + struct btrfs_map_token token; + + btrfs_init_map_token(&token); leaf = path->nodes[0]; slot = path->slots[0]; @@ -3619,8 +3647,9 @@ int setup_items_for_insert(struct btrfs_trans_handle *trans, u32 ioff; item = btrfs_item_nr(leaf, i); - ioff = btrfs_item_offset(leaf, item); - btrfs_set_item_offset(leaf, item, ioff - total_data); + ioff = btrfs_token_item_offset(leaf, item, &token); + btrfs_set_token_item_offset(leaf, item, + ioff - total_data, &token); } /* shift the items */ memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot + nr), @@ -3639,9 +3668,10 @@ int setup_items_for_insert(struct btrfs_trans_handle *trans, btrfs_cpu_key_to_disk(&disk_key, cpu_key + i); btrfs_set_item_key(leaf, &disk_key, slot + i); item = btrfs_item_nr(leaf, slot + i); - btrfs_set_item_offset(leaf, item, data_end - data_size[i]); + btrfs_set_token_item_offset(leaf, item, + data_end - data_size[i], &token); data_end -= data_size[i]; - btrfs_set_item_size(leaf, item, data_size[i]); + btrfs_set_token_item_size(leaf, item, data_size[i], &token); } btrfs_set_header_nritems(leaf, nritems + nr); @@ -3814,6 +3844,9 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, int wret; int i; u32 nritems; + struct btrfs_map_token token; + + btrfs_init_map_token(&token); leaf = path->nodes[0]; last_off = btrfs_item_offset_nr(leaf, slot + nr - 1); @@ -3835,8 +3868,9 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, u32 ioff; item = btrfs_item_nr(leaf, i); - ioff = btrfs_item_offset(leaf, item); - btrfs_set_item_offset(leaf, item, ioff + dsize); + ioff = btrfs_token_item_offset(leaf, item, &token); + btrfs_set_token_item_offset(leaf, item, + ioff + dsize, &token); } memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot), diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 85ab1c5844a..c2e17cd299b 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1546,6 +1546,17 @@ struct btrfs_ioctl_defrag_range_args { #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31) +struct btrfs_map_token { + struct extent_buffer *eb; + char *kaddr; + unsigned long offset; +}; + +static inline void btrfs_init_map_token (struct btrfs_map_token *token) +{ + memset(token, 0, sizeof(*token)); +} + /* some macros to generate set/get funcs for the struct fields. This * assumes there is a lefoo_to_cpu for every type, so lets make a simple * one for u8: @@ -1569,6 +1580,8 @@ struct btrfs_ioctl_defrag_range_args { #ifndef BTRFS_SETGET_FUNCS #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ u##bits btrfs_##name(struct extent_buffer *eb, type *s); \ +u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, struct btrfs_map_token *token); \ +void btrfs_set_token_##name(struct extent_buffer *eb, type *s, u##bits val, struct btrfs_map_token *token);\ void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val); #endif diff --git a/fs/btrfs/struct-funcs.c b/fs/btrfs/struct-funcs.c index bc1f6ad1844..c6ffa581241 100644 --- a/fs/btrfs/struct-funcs.c +++ b/fs/btrfs/struct-funcs.c @@ -44,8 +44,9 @@ #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ u##bits btrfs_##name(struct extent_buffer *eb, type *s); \ void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val); \ -u##bits btrfs_##name(struct extent_buffer *eb, \ - type *s) \ +void btrfs_set_token_##name(struct extent_buffer *eb, type *s, u##bits val, struct btrfs_map_token *token); \ +u##bits btrfs_token_##name(struct extent_buffer *eb, \ + type *s, struct btrfs_map_token *token) \ { \ unsigned long part_offset = (unsigned long)s; \ unsigned long offset = part_offset + offsetof(type, member); \ @@ -54,9 +55,18 @@ u##bits btrfs_##name(struct extent_buffer *eb, \ char *kaddr; \ unsigned long map_start; \ unsigned long map_len; \ + unsigned long mem_len = sizeof(((type *)0)->member); \ u##bits res; \ + if (token && token->kaddr && token->offset <= offset && \ + token->eb == eb && \ + (token->offset + PAGE_CACHE_SIZE >= offset + mem_len)) { \ + kaddr = token->kaddr; \ + p = (type *)(kaddr + part_offset - token->offset); \ + res = le##bits##_to_cpu(p->member); \ + return res; \ + } \ err = map_private_extent_buffer(eb, offset, \ - sizeof(((type *)0)->member), \ + mem_len, \ &kaddr, &map_start, &map_len); \ if (err) { \ __le##bits leres; \ @@ -65,10 +75,15 @@ u##bits btrfs_##name(struct extent_buffer *eb, \ } \ p = (type *)(kaddr + part_offset - map_start); \ res = le##bits##_to_cpu(p->member); \ + if (token) { \ + token->kaddr = kaddr; \ + token->offset = map_start; \ + token->eb = eb; \ + } \ return res; \ } \ -void btrfs_set_##name(struct extent_buffer *eb, \ - type *s, u##bits val) \ +void btrfs_set_token_##name(struct extent_buffer *eb, \ + type *s, u##bits val, struct btrfs_map_token *token) \ { \ unsigned long part_offset = (unsigned long)s; \ unsigned long offset = part_offset + offsetof(type, member); \ @@ -77,8 +92,17 @@ void btrfs_set_##name(struct extent_buffer *eb, \ char *kaddr; \ unsigned long map_start; \ unsigned long map_len; \ + unsigned long mem_len = sizeof(((type *)0)->member); \ + if (token && token->kaddr && token->offset <= offset && \ + token->eb == eb && \ + (token->offset + PAGE_CACHE_SIZE >= offset + mem_len)) { \ + kaddr = token->kaddr; \ + p = (type *)(kaddr + part_offset - token->offset); \ + p->member = cpu_to_le##bits(val); \ + return; \ + } \ err = map_private_extent_buffer(eb, offset, \ - sizeof(((type *)0)->member), \ + mem_len, \ &kaddr, &map_start, &map_len); \ if (err) { \ __le##bits val2; \ @@ -88,7 +112,22 @@ void btrfs_set_##name(struct extent_buffer *eb, \ } \ p = (type *)(kaddr + part_offset - map_start); \ p->member = cpu_to_le##bits(val); \ -} + if (token) { \ + token->kaddr = kaddr; \ + token->offset = map_start; \ + token->eb = eb; \ + } \ +} \ +void btrfs_set_##name(struct extent_buffer *eb, \ + type *s, u##bits val) \ +{ \ + btrfs_set_token_##name(eb, s, val, NULL); \ +} \ +u##bits btrfs_##name(struct extent_buffer *eb, \ + type *s) \ +{ \ + return btrfs_token_##name(eb, s, NULL); \ +} \ #include "ctree.h" -- 2.20.1