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Commit f5f28773 authored by Sonny Rao's avatar Sonny Rao Committed by Dave Kleikamp
Browse files

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: default avatarDave Kleikamp <shaggy@austin.ibm.com>
parent a8ad86f2

fs/jfs/jfs_unicode.c

+4 −3
Original line number Diff line number Diff line
@@ -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]));