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| author | hanjinke <hanjinke.666@bytedance.com> | 2022-06-06 18:53:05 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2022-08-03 06:52:19 +0300 |
| commit | 218a69441bf7f65155b96584e354f12c28b7944a (patch) | |
| tree | 60a95a16a6fc2be741d905cd6b829da3b71e3277 /fs/ext4 | |
| parent | 827891a38accfb4e04dbcdefe710f8746c6ad16d (diff) | |
| download | linux-218a69441bf7f65155b96584e354f12c28b7944a.tar.xz | |
ext4: reuse order and buddy in mb_mark_used when buddy split
After each buddy split, mb_mark_used will search the proper order
for the block which may consume some loop in mb_find_order_for_block.
In fact, we can reuse the order and buddy generated by the buddy split.
Reviewed by: lei.rao@intel.com
Signed-off-by: hanjinke <hanjinke.666@bytedance.com>
Link: https://lore.kernel.org/r/20220606155305.74146-1-hanjinke.666@bytedance.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/mballoc.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 9e06334771a3..b02f71f07289 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -1933,6 +1933,7 @@ static int mb_mark_used(struct ext4_buddy *e4b, struct ext4_free_extent *ex) unsigned ret = 0; int len0 = len; void *buddy; + bool split = false; BUG_ON(start + len > (e4b->bd_sb->s_blocksize << 3)); BUG_ON(e4b->bd_group != ex->fe_group); @@ -1957,12 +1958,16 @@ static int mb_mark_used(struct ext4_buddy *e4b, struct ext4_free_extent *ex) /* let's maintain buddy itself */ while (len) { - ord = mb_find_order_for_block(e4b, start); + if (!split) + ord = mb_find_order_for_block(e4b, start); if (((start >> ord) << ord) == start && len >= (1 << ord)) { /* the whole chunk may be allocated at once! */ mlen = 1 << ord; - buddy = mb_find_buddy(e4b, ord, &max); + if (!split) + buddy = mb_find_buddy(e4b, ord, &max); + else + split = false; BUG_ON((start >> ord) >= max); mb_set_bit(start >> ord, buddy); e4b->bd_info->bb_counters[ord]--; @@ -1989,6 +1994,7 @@ static int mb_mark_used(struct ext4_buddy *e4b, struct ext4_free_extent *ex) mb_clear_bit(cur + 1, buddy); e4b->bd_info->bb_counters[ord]++; e4b->bd_info->bb_counters[ord]++; + split = true; } mb_set_largest_free_order(e4b->bd_sb, e4b->bd_info); |