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authorChao Yu <chao2.yu@samsung.com>2015-08-26 20:34:48 +0800
committerJaegeuk Kim <jaegeuk@kernel.org>2015-08-26 11:50:35 -0700
commit19b2c30d3cce928010138cae4b9e57c388aa065c (patch)
treeec33691073b116fc43ffb2148a01dc3cca3f41bf /fs/f2fs/extent_cache.c
parent13ec7297e5331f2754d7629a068c619c41f20e56 (diff)
f2fs: update extent tree in batches
This patch introduce a new helper f2fs_update_extent_tree_range which can do extent mapping update at a specified range. The main idea is: 1) punch all mapping info in extent node(s) which are at a specified range; 2) try to merge new extent mapping with adjacent node, or failing that, insert the mapping into extent tree as a new node. In order to see the benefit, I add a function for stating time stamping count as below: uint64_t rdtsc(void) { uint32_t lo, hi; __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi)); return (uint64_t)hi << 32 | lo; } My test environment is: ubuntu, intel i7-3770, 16G memory, 256g micron ssd. truncation path: update extent cache from truncate_data_blocks_range non-truncataion path: update extent cache from other paths total: all update paths a) Removing 128MB file which has one extent node mapping whole range of file: 1. dd if=/dev/zero of=/mnt/f2fs/128M bs=1M count=128 2. sync 3. rm /mnt/f2fs/128M Before: total count average truncation: 7651022 32768 233.49 Patched: total count average truncation: 3321 33 100.64 b) fsstress: fsstress -d /mnt/f2fs -l 5 -n 100 -p 20 Test times: 5 times. Before: total count average truncation: 5812480.6 20911.6 277.95 non-truncation: 7783845.6 13440.8 579.12 total: 13596326.2 34352.4 395.79 Patched: total count average truncation: 1281283.0 3041.6 421.25 non-truncation: 7355844.4 13662.8 538.38 total: 8637127.4 16704.4 517.06 1) For the updates in truncation path: - we can see updating in batches leads total tsc and update count reducing explicitly; - besides, for a single batched updating, punching multiple extent nodes in a loop, result in executing more operations, so our average tsc increase intensively. 2) For the updates in non-truncation path: - there is a little improvement, that is because for the scenario that we just need to update in the head or tail of extent node, new interface optimize to update info in extent node directly, rather than removing original extent node for updating and then inserting that updated one into cache as new node. Signed-off-by: Chao Yu <chao2.yu@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/extent_cache.c')
-rw-r--r--fs/f2fs/extent_cache.c217
1 files changed, 158 insertions, 59 deletions
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index dcfeb43a5975..e6b245718ef0 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -386,23 +386,21 @@ do_insert:
return en;
}
-/* return true, if on-disk extent should be updated */
-static bool f2fs_update_extent_tree(struct inode *inode, pgoff_t fofs,
- block_t blkaddr)
+unsigned int f2fs_update_extent_tree_range(struct inode *inode,
+ pgoff_t fofs, block_t blkaddr, unsigned int len)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct extent_tree *et = F2FS_I(inode)->extent_tree;
struct extent_node *en = NULL, *en1 = NULL, *en2 = NULL, *en3 = NULL;
- struct extent_node *den = NULL, *prev_ex = NULL, *next_ex = NULL;
+ struct extent_node *prev_en = NULL, *next_en = NULL;
struct extent_info ei, dei, prev;
struct rb_node **insert_p = NULL, *insert_parent = NULL;
- unsigned int endofs;
+ unsigned int end = fofs + len;
+ unsigned int pos = (unsigned int)fofs;
if (!et)
return false;
- trace_f2fs_update_extent_tree(inode, fofs, blkaddr);
-
write_lock(&et->lock);
if (is_inode_flag_set(F2FS_I(inode), FI_NO_EXTENT)) {
@@ -416,39 +414,143 @@ static bool f2fs_update_extent_tree(struct inode *inode, pgoff_t fofs,
/* we do not guarantee that the largest extent is cached all the time */
f2fs_drop_largest_extent(inode, fofs);
- /* 1. lookup and remove existing extent info in cache */
- en = __lookup_extent_tree_ret(et, fofs, &prev_ex, &next_ex,
+ /* 1. lookup first extent node in range [fofs, fofs + len - 1] */
+ en = __lookup_extent_tree_ret(et, fofs, &prev_en, &next_en,
&insert_p, &insert_parent);
- if (!en)
- goto update_extent;
-
- dei = en->ei;
- __detach_extent_node(sbi, et, en);
-
- /* 2. if extent can be split, try to split it */
- if (dei.len > F2FS_MIN_EXTENT_LEN) {
- /* insert left part of split extent into cache */
- if (fofs - dei.fofs >= F2FS_MIN_EXTENT_LEN) {
- set_extent_info(&ei, dei.fofs, dei.blk,
- fofs - dei.fofs);
- en1 = __insert_extent_tree(sbi, et, &ei, NULL, NULL);
+ if (!en) {
+ if (next_en) {
+ en = next_en;
+ f2fs_bug_on(sbi, en->ei.fofs <= pos);
+ pos = en->ei.fofs;
+ } else {
+ /*
+ * skip searching in the tree since there is no
+ * larger extent node in the cache.
+ */
+ goto update_extent;
+ }
+ }
+
+ /* 2. invlidate all extent nodes in range [fofs, fofs + len - 1] */
+ while (en) {
+ struct rb_node *node;
+
+ if (pos >= end)
+ break;
+
+ dei = en->ei;
+ en1 = en2 = NULL;
+
+ node = rb_next(&en->rb_node);
+
+ /*
+ * 2.1 there are four cases when we invalidate blkaddr in extent
+ * node, |V: valid address, X: will be invalidated|
+ */
+ /* case#1, invalidate right part of extent node |VVVVVXXXXX| */
+ if (pos > dei.fofs && end >= dei.fofs + dei.len) {
+ en->ei.len = pos - dei.fofs;
+
+ if (en->ei.len < F2FS_MIN_EXTENT_LEN) {
+ __detach_extent_node(sbi, et, en);
+ insert_p = NULL;
+ insert_parent = NULL;
+ goto update;
+ }
+
+ if (__is_extent_same(&dei, &et->largest))
+ et->largest = en->ei;
+ goto next;
+ }
+
+ /* case#2, invalidate left part of extent node |XXXXXVVVVV| */
+ if (pos <= dei.fofs && end < dei.fofs + dei.len) {
+ en->ei.fofs = end;
+ en->ei.blk += end - dei.fofs;
+ en->ei.len -= end - dei.fofs;
+
+ if (en->ei.len < F2FS_MIN_EXTENT_LEN) {
+ __detach_extent_node(sbi, et, en);
+ insert_p = NULL;
+ insert_parent = NULL;
+ goto update;
+ }
+
+ if (__is_extent_same(&dei, &et->largest))
+ et->largest = en->ei;
+ goto next;
}
- /* insert right part of split extent into cache */
- endofs = dei.fofs + dei.len - 1;
- if (endofs - fofs >= F2FS_MIN_EXTENT_LEN) {
- set_extent_info(&ei, fofs + 1,
- fofs - dei.fofs + dei.blk + 1, endofs - fofs);
- en2 = __insert_extent_tree(sbi, et, &ei, NULL, NULL);
+ __detach_extent_node(sbi, et, en);
+
+ /*
+ * if we remove node in rb-tree, our parent node pointer may
+ * point the wrong place, discard them.
+ */
+ insert_p = NULL;
+ insert_parent = NULL;
+
+ /* case#3, invalidate entire extent node |XXXXXXXXXX| */
+ if (pos <= dei.fofs && end >= dei.fofs + dei.len) {
+ if (__is_extent_same(&dei, &et->largest))
+ et->largest.len = 0;
+ goto update;
+ }
+
+ /*
+ * case#4, invalidate data in the middle of extent node
+ * |VVVXXXXVVV|
+ */
+ if (dei.len > F2FS_MIN_EXTENT_LEN) {
+ unsigned int endofs;
+
+ /* insert left part of split extent into cache */
+ if (pos - dei.fofs >= F2FS_MIN_EXTENT_LEN) {
+ set_extent_info(&ei, dei.fofs, dei.blk,
+ pos - dei.fofs);
+ en1 = __insert_extent_tree(sbi, et, &ei,
+ NULL, NULL);
+ }
+
+ /* insert right part of split extent into cache */
+ endofs = dei.fofs + dei.len;
+ if (endofs - end >= F2FS_MIN_EXTENT_LEN) {
+ set_extent_info(&ei, end,
+ end - dei.fofs + dei.blk,
+ endofs - end);
+ en2 = __insert_extent_tree(sbi, et, &ei,
+ NULL, NULL);
+ }
}
+update:
+ /* 2.2 update in global extent list */
+ spin_lock(&sbi->extent_lock);
+ if (en && !list_empty(&en->list))
+ list_del(&en->list);
+ if (en1)
+ list_add_tail(&en1->list, &sbi->extent_list);
+ if (en2)
+ list_add_tail(&en2->list, &sbi->extent_list);
+ spin_unlock(&sbi->extent_lock);
+
+ /* 2.3 release extent node */
+ if (en)
+ kmem_cache_free(extent_node_slab, en);
+next:
+ en = node ? rb_entry(node, struct extent_node, rb_node) : NULL;
+ next_en = en;
+ if (en)
+ pos = en->ei.fofs;
}
update_extent:
/* 3. update extent in extent cache */
if (blkaddr) {
- set_extent_info(&ei, fofs, blkaddr, 1);
+ struct extent_node *den = NULL;
+
+ set_extent_info(&ei, fofs, blkaddr, len);
en3 = __try_merge_extent_node(sbi, et, &ei, &den,
- prev_ex, next_ex);
+ prev_en, next_en);
if (!en3)
en3 = __insert_extent_tree(sbi, et, &ei,
insert_p, insert_parent);
@@ -460,36 +562,21 @@ update_extent:
et->largest.len = 0;
set_inode_flag(F2FS_I(inode), FI_NO_EXTENT);
}
- }
- /* 4. update in global extent list */
- spin_lock(&sbi->extent_lock);
- if (en && !list_empty(&en->list))
- list_del(&en->list);
- /*
- * en1 and en2 split from en, they will become more and more smaller
- * fragments after splitting several times. So if the length is smaller
- * than F2FS_MIN_EXTENT_LEN, we will not add them into extent tree.
- */
- if (en1)
- list_add_tail(&en1->list, &sbi->extent_list);
- if (en2)
- list_add_tail(&en2->list, &sbi->extent_list);
- if (en3) {
- if (list_empty(&en3->list))
- list_add_tail(&en3->list, &sbi->extent_list);
- else
- list_move_tail(&en3->list, &sbi->extent_list);
- }
- if (den && !list_empty(&den->list))
- list_del(&den->list);
- spin_unlock(&sbi->extent_lock);
+ spin_lock(&sbi->extent_lock);
+ if (en3) {
+ if (list_empty(&en3->list))
+ list_add_tail(&en3->list, &sbi->extent_list);
+ else
+ list_move_tail(&en3->list, &sbi->extent_list);
+ }
+ if (den && !list_empty(&den->list))
+ list_del(&den->list);
+ spin_unlock(&sbi->extent_lock);
- /* 5. release extent node */
- if (en)
- kmem_cache_free(extent_node_slab, en);
- if (den)
- kmem_cache_free(extent_node_slab, den);
+ if (den)
+ kmem_cache_free(extent_node_slab, den);
+ }
if (is_inode_flag_set(F2FS_I(inode), FI_NO_EXTENT))
__free_extent_tree(sbi, et, true);
@@ -645,10 +732,22 @@ void f2fs_update_extent_cache(struct dnode_of_data *dn)
f2fs_bug_on(F2FS_I_SB(dn->inode), dn->data_blkaddr == NEW_ADDR);
+
fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) +
dn->ofs_in_node;
- if (f2fs_update_extent_tree(dn->inode, fofs, dn->data_blkaddr))
+ if (f2fs_update_extent_tree_range(dn->inode, fofs, dn->data_blkaddr, 1))
+ sync_inode_page(dn);
+}
+
+void f2fs_update_extent_cache_range(struct dnode_of_data *dn,
+ pgoff_t fofs, block_t blkaddr, unsigned int len)
+
+{
+ if (!f2fs_may_extent_tree(dn->inode))
+ return;
+
+ if (f2fs_update_extent_tree_range(dn->inode, fofs, blkaddr, len))
sync_inode_page(dn);
}