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authorSonny Rao <sonny@burdell.org>2005-06-23 16:57:56 -0500
committerDave Kleikamp <shaggy@austin.ibm.com>2005-06-23 16:57:56 -0500
commitf5f287738bddf38ec9ca79344f00dab675e1bbf5 (patch)
treec8144a3906f6904f7cf18c4520976c79a1e15b0a
parenta8ad86f2dc46356f87be1327dabc18bdbda32f50 (diff)
downloadlinux-f5f287738bddf38ec9ca79344f00dab675e1bbf5.tar.bz2
JFS: performance patch
Basically, we saw a large amount of time spent in the jfs_strfromUCS_le() function, mispredicting the branch inside the loop, so I just added some unlikely modifiers to the if statements to re-ordered the code. Again, these simple changes provided > 2 % on spec-sfs, so please consider it for inclusion. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
-rw-r--r--fs/jfs/jfs_unicode.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/jfs/jfs_unicode.c b/fs/jfs/jfs_unicode.c
index b32208aad550..f327decfb155 100644
--- a/fs/jfs/jfs_unicode.c
+++ b/fs/jfs/jfs_unicode.c
@@ -51,8 +51,9 @@ int jfs_strfromUCS_le(char *to, const __le16 * from,
}
} else {
for (i = 0; (i < len) && from[i]; i++) {
- if (le16_to_cpu(from[i]) & 0xff00) {
- if (warn) {
+ if (unlikely(le16_to_cpu(from[i]) & 0xff00)) {
+ to[i] = '?';
+ if (unlikely(warn)) {
warn--;
warn_again--;
printk(KERN_ERR
@@ -61,7 +62,7 @@ int jfs_strfromUCS_le(char *to, const __le16 * from,
printk(KERN_ERR
"mount with iocharset=utf8 to access\n");
}
- to[i] = '?';
+
}
else
to[i] = (char) (le16_to_cpu(from[i]));