Techwizz/kernel-fxtec-pro1x
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vfs: drop conditional inode prefetch in __do_lookup_rcu

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It seems to hurt performance in real life.  Yes, the inode will be used
later, but the conditional doesn't seem to predict all that well
(negative dentries are not uncommon) and it looks like the cost of
prefetching is simply higher than depending on the cache doing the right
thing.

As usual.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2011-07-21 11:01:42 -07:00
parent b307d4655a
commit b91da88fed
1 changed files with 0 additions and 2 deletions
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fs/dcache.c
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@ -1813,8 +1813,6 @@ struct dentry *__d_lookup_rcu(struct dentry *parent, struct qstr *name,
tname = dentry->d_name.name;
i = dentry->d_inode;
prefetch(tname);
if (i)
prefetch(i);
/*
* This seqcount check is required to ensure name and
* len are loaded atomically, so as not to walk off the