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e798b3f8a9
linux/fs/ocfs2
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Joel Becker e798b3f8a9 ocfs2: Don't hand-code xor in ocfs2_hamming_encode(). 
When I wrote ocfs2_hamming_encode(), I was following documentation of
the algorithm and didn't have quite the (possibly still imperfect) grasp
of it I do now.  As part of this, I literally hand-coded xor.  I would
test a bit, and then add that bit via xor to the parity word.

I can, of course, just do a single xor of the parity word and the source
word (the code buffer bit offset).  This cuts CPU usage by 53% on a
mostly populated buffer (an inode containing utmp.h inline).

Joel

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
2009-01-05 08:40:34 -08:00
..
cluster ocfs2/quota: Add QUOTA in mlog_attribute. 2009-01-05 08:40:30 -08:00
dlm Merge branch 'master' into next 2008-12-04 17:16:36 +11:00
acl.c ocfs2: add ocfs2_init_acl in mknod 2009-01-05 08:34:20 -08:00
acl.h ocfs2: add ocfs2_init_acl in mknod 2009-01-05 08:34:20 -08:00
alloc.c ocfs2: Create ocfs2_xattr_value_buf. 2009-01-05 08:40:32 -08:00
alloc.h ocfs2: Create ocfs2_xattr_value_buf. 2009-01-05 08:40:32 -08:00
aops.c ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 2009-01-05 08:40:32 -08:00
aops.h ocfs2: convert to new aops 2007-10-16 09:42:58 -07:00
blockcheck.c ocfs2: Don't hand-code xor in ocfs2_hamming_encode(). 2009-01-05 08:40:34 -08:00
blockcheck.h ocfs2: Add the underlying blockcheck code. 2009-01-05 08:40:31 -08:00
buffer_head_io.c ocfs2: Use BH_JBDPrivateStart instead of BH_Unshadow 2009-01-05 08:40:24 -08:00
buffer_head_io.h ocfs2: Validate metadata only when it's read from disk. 2009-01-05 08:36:53 -08:00
dcache.c ocfs2: Remove mount/unmount votes 2008-01-25 14:45:34 -08:00
dcache.h
dir.c ocfs2: Checksum and ECC for directory blocks. 2009-01-05 08:40:34 -08:00
dir.h ocfs2: Checksum and ECC for directory blocks. 2009-01-05 08:40:34 -08:00
dlmglue.c ocfs2: Fix ocfs2_read_quota_block() error handling. 2009-01-05 08:40:24 -08:00
dlmglue.h ocfs2: Implementation of local and global quota file handling 2009-01-05 08:40:23 -08:00
export.c [PATCH] switch all filesystems over to d_obtain_alias 2008-10-23 05:13:01 -04:00
export.h exportfs: make struct export_operations const 2007-10-22 08:13:21 -07:00
extent_map.c ocfs2: Wrap virtual block reads in ocfs2_read_virt_blocks() 2009-01-05 08:36:54 -08:00
extent_map.h ocfs2: Wrap virtual block reads in ocfs2_read_virt_blocks() 2009-01-05 08:36:54 -08:00
file.c ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 2009-01-05 08:40:32 -08:00
file.h ocfs2: Implementation of local and global quota file handling 2009-01-05 08:40:23 -08:00
heartbeat.c ocfs2: Move o2hb functionality into the stack glue. 2008-04-18 08:56:04 -07:00
heartbeat.h ocfs2: Move o2hb functionality into the stack glue. 2008-04-18 08:56:04 -07:00
inode.c ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 2009-01-05 08:40:32 -08:00
inode.h ocfs2: Implementation of local and global quota file handling 2009-01-05 08:40:23 -08:00
ioctl.c ocfs2: Don't check for NULL before brelse() 2008-10-13 17:02:44 -07:00
ioctl.h ocfs2: Convert ocfs2 over to unlocked_ioctl 2008-04-18 08:56:11 -07:00
journal.c ocfs2: Checksum and ECC for directory blocks. 2009-01-05 08:40:34 -08:00
journal.h ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 2009-01-05 08:40:32 -08:00
localalloc.c ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 2009-01-05 08:40:32 -08:00
localalloc.h ocfs2: throttle back local alloc when low on disk space 2008-10-13 13:57:57 -07:00
locks.c ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
locks.h ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
Makefile ocfs2: Add the underlying blockcheck code. 2009-01-05 08:40:31 -08:00
mmap.c ocfs2: return 0 in page_mkwrite to let VFS retry. 2008-11-10 09:51:47 -08:00
mmap.h
namei.c ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 2009-01-05 08:40:32 -08:00
namei.h ocfs2: Move directory manipulation code into dir.c 2007-10-12 11:54:36 -07:00
ocfs1_fs_compat.h fs/: Spelling fixes 2008-02-03 17:33:42 +02:00
ocfs2_fs.h ocfs2: Enable metadata checksums. 2009-01-05 08:40:34 -08:00
ocfs2_lockid.h ocfs2: Implementation of local and global quota file handling 2009-01-05 08:40:23 -08:00
ocfs2_lockingver.h ocfs2: Negotiate locking protocol versions. 2008-02-06 16:11:29 -08:00
ocfs2.h ocfs2: Add directory block trailers. 2009-01-05 08:40:34 -08:00
quota_global.c ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 2009-01-05 08:40:32 -08:00
quota_local.c ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 2009-01-05 08:40:32 -08:00
quota.h ocfs2: Fix ocfs2_read_quota_block() error handling. 2009-01-05 08:40:24 -08:00
resize.c ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 2009-01-05 08:40:32 -08:00
resize.h [PATCH 2/2] ocfs2: Implement group add for online resize 2008-01-25 15:04:24 -08:00
slot_map.c ocfs2: Validate metadata only when it's read from disk. 2009-01-05 08:36:53 -08:00
slot_map.h ocfs2: De-magic the in-memory slot map. 2008-04-18 08:56:03 -07:00
stack_o2cb.c ocfs2: Remove ->hangup() from stack glue operations. 2008-06-16 10:46:52 -07:00
stack_user.c ocfs2: initialize stack_user lvbptr 2008-12-01 14:46:39 -08:00
stackglue.c ocfs2: Remove pointless !! 2008-10-13 17:02:44 -07:00
stackglue.h ocfs2: POSIX file locks support 2008-10-13 13:57:57 -07:00
suballoc.c ocfs2: Use metadata-specific ocfs2_journal_access_*() functions. 2009-01-05 08:40:32 -08:00
suballoc.h ocfs2: Validate metadata only when it's read from disk. 2009-01-05 08:36:53 -08:00
super.c ocfs2: Validate superblock with checksum and ecc. 2009-01-05 08:40:34 -08:00
super.h ocfs2: use s_maxbytes directly in ocfs2_change_file_space() 2007-08-09 17:25:07 -07:00
symlink.c ocfs2: Wrap inode block reads in a dedicated function. 2009-01-05 08:36:52 -08:00
symlink.h
sysfile.c ocfs2: Silence false lockdep warnings 2008-01-25 15:05:44 -08:00
sysfile.h
uptodate.c ocfs2: use smaller counters in ocfs2_remove_xattr_clusters_from_cache 2008-10-13 17:02:44 -07:00
uptodate.h ocfs2: Add helper function in uptodate.c for removing xattr clusters 2008-10-13 13:57:59 -07:00
ver.c ocfs2: bump version number 2008-01-25 15:05:46 -08:00
ver.h
xattr.c ocfs2: Use proper journal_access function in xattr.c 2009-01-05 08:40:34 -08:00
xattr.h ocfs2: Create ocfs2_xattr_value_buf. 2009-01-05 08:40:32 -08:00