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ext4: Use atomic_t's in struct flex_groups

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Reduce pressure on the sb_bgl_lock family of locks by using atomic_t's
to track the number of free blocks and inodes in each flex_group.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2009-03-04 19:09:10 -05:00
parent b713a5ec55
commit 9f24e4208f
6 changed files with 30 additions and 37 deletions
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8
fs/ext4/super.c
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@@ -1630,10 +1630,10 @@ static int ext4_fill_flex_info(struct super_block *sb)
gdp = ext4_get_group_desc(sb, i, &bh);
flex_group = ext4_flex_group(sbi, i);
sbi->s_flex_groups[flex_group].free_inodes +=
ext4_free_inodes_count(sb, gdp);
sbi->s_flex_groups[flex_group].free_blocks +=
ext4_free_blks_count(sb, gdp);
atomic_set(&sbi->s_flex_groups[flex_group].free_inodes,
ext4_free_inodes_count(sb, gdp));
atomic_set(&sbi->s_flex_groups[flex_group].free_blocks,
ext4_free_blks_count(sb, gdp));
}
return 1;