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ext4: improve smp scalability for inode generation

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->s_next_generation is protected by s_next_gen_lock but its usage
pattern is very primitive.  We don't actually need sequentially
increasing new generation numbers, so let's use prandom_u32() instead.

Reported-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2017-11-08 22:23:20 -05:00
parent d77147ff44
commit 2325306802
4 changed files with 4 additions and 12 deletions
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4
fs/ext4/ialloc.c
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@@ -1138,9 +1138,7 @@ got:
inode->i_ino);
goto out;
}
spin_lock(&sbi->s_next_gen_lock);
inode->i_generation = sbi->s_next_generation++;
spin_unlock(&sbi->s_next_gen_lock);
inode->i_generation = prandom_u32();
/* Precompute checksum seed for inode metadata */
if (ext4_has_metadata_csum(sb)) {