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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 /fs/afs/dir.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 'fs/afs/dir.c')
-rw-r--r--fs/afs/dir.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 2c18cde27000..b8bb7e7148d0 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -581,7 +581,7 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
581 } 581 }
582 582
583success: 583success:
584 dentry->d_op = &afs_fs_dentry_operations; 584 d_set_d_op(dentry, &afs_fs_dentry_operations);
585 585
586 d_add(dentry, inode); 586 d_add(dentry, inode);
587 _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }", 587 _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }",