sugar/linux
1
0
Fork 0
Code Activity

fs: dcache reduce branches in lookup path

Browse Source 
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>
This commit is contained in:
Nick Piggin
2011-01-07 17:49:55 +11:00
parent 5f57cbcc02
commit fb045adb99
63 changed files with 174 additions and 137 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
fs/cifs/readdir.c
View File

@@ -103,9 +103,9 @@ cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
}
if (cifs_sb_master_tcon(CIFS_SB(sb))->nocase)
dentry->d_op = &cifs_ci_dentry_ops;
d_set_d_op(dentry, &cifs_ci_dentry_ops);
else
dentry->d_op = &cifs_dentry_ops;
d_set_d_op(dentry, &cifs_dentry_ops);
alias = d_materialise_unique(dentry, inode);
if (alias != NULL) {