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ext4: optimize ext4_should_retry_alloc() to improve ENOSPC performance

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If there are no pending blocks to be released after a commit, forcing
a journal commit has no hope of helping.  It's possible that a commit
had just completed, so if there are now free blocks available for
allocation, it's worth retrying the commit.

Reported-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2016-06-26 18:24:01 -04:00
parent 1a695a905c
commit d08854f5bc
4 changed files with 23 additions and 4 deletions
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4
fs/ext4/balloc.c
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@@ -610,7 +610,9 @@ int ext4_should_retry_alloc(struct super_block *sb, int *retries)
jbd_debug(1, "%s: retrying operation after ENOSPC\n", sb->s_id);
jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal);
smp_mb();
if (EXT4_SB(sb)->s_mb_free_pending)
jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal);
return 1;
}