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authorNick Piggin <npiggin@kernel.dk>2011-01-07 01:49:55 -0500
committerNick Piggin <npiggin@kernel.dk>2011-01-07 01:50:28 -0500
commitfb045adb99d9b7c562dc7fef834857f78249daa1 (patch)
tree1fd6a4024fffeec568abe100d730589bfdb81c38 /kernel/cgroup.c
parent5f57cbcc02cf18f6b22ef4066bb10afeb8f930ff (diff)
fs: dcache reduce branches in lookup path
Reduce some branches and memory accesses in dcache lookup by adding dentry flags to indicate common d_ops are set, rather than having to check them. This saves a pointer memory access (dentry->d_op) in common path lookup situations, and saves another pointer load and branch in cases where we have d_op but not the particular operation. Patched with: git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 9f41470c3949..51cddc11cd85 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2222,7 +2222,7 @@ static struct dentry *cgroup_lookup(struct inode *dir,
2222 2222
2223 if (dentry->d_name.len > NAME_MAX) 2223 if (dentry->d_name.len > NAME_MAX)
2224 return ERR_PTR(-ENAMETOOLONG); 2224 return ERR_PTR(-ENAMETOOLONG);
2225 dentry->d_op = &cgroup_dentry_operations; 2225 d_set_d_op(dentry, &cgroup_dentry_operations);
2226 d_add(dentry, NULL); 2226 d_add(dentry, NULL);
2227 return NULL; 2227 return NULL;
2228} 2228}