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David Chinner d234154125 [XFS] Use power-of-2 sized buffers to reduce overhead 
Now that the ktrace_enter() code is using atomics, the non-power-of-2
buffer sizes - which require modulus operations to get the index - are
showing up as using substantial CPU in the profiles.

Force the buffer sizes to be rounded up to the nearest power of two and
use masking rather than modulus operations to convert the index counter to
the buffer index. This reduces ktrace_enter overhead to 8% of a CPU time,
and again almost halves the trace intensive test runtime.

SGI-PV: 977546
SGI-Modid: xfs-linux-melb:xfs-kern:30538a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
 		2008-04-18 11:40:04 +10:00
..
linux-2.6 [XFS] don't encode parent in nfs filehandles unless nessecary 2008-04-18 11:39:35 +10:00
quota [XFS] remove shouting-indirection macros from xfs_sb.h 2008-04-10 16:24:45 +10:00
support [XFS] Use power-of-2 sized buffers to reduce overhead 2008-04-18 11:40:04 +10:00
Kconfig [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
Makefile [XFS] Added quota targets and removed dmapi directory 2008-02-18 13:06:17 +11:00
xfs.h [XFS] clean up vnode/inode tracing 2008-02-07 16:42:19 +11:00
xfs_acl.c [XFS] use generic_permission 2008-02-07 18:22:38 +11:00
xfs_acl.h [XFS] use generic_permission 2008-02-07 18:22:38 +11:00
xfs_ag.h [XFS] Unwrap pagb_lock. 2008-02-07 16:46:39 +11:00
xfs_alloc.c xfs: convert beX_add to beX_add_cpu (new common API) 2008-02-13 16:21:19 -08:00
xfs_alloc.h [XFS] Lazy Superblock Counters 2007-07-14 15:28:50 +10:00
xfs_alloc_btree.c xfs: convert beX_add to beX_add_cpu (new common API) 2008-02-13 16:21:19 -08:00
xfs_alloc_btree.h [XFS] Remove unused arguments from the XFS_BTREE_*_ADDR macros. 2007-02-10 18:37:33 +11:00
xfs_arch.h xfs: convert beX_add to beX_add_cpu (new common API) 2008-02-13 16:21:19 -08:00
xfs_attr.c [XFS] Fix up sparse warnings. 2008-02-07 18:14:38 +11:00
xfs_attr.h [XFS] kill struct bhv_vnode 2007-10-16 11:40:24 +10:00
xfs_attr_leaf.c [XFS] remove shouting-indirection macros from xfs_sb.h 2008-04-10 16:24:45 +10:00
xfs_attr_leaf.h [XFS] Add EA list callbacks for xfs kernel use. Cleanup some namespace 2006-09-28 11:01:37 +10:00
xfs_attr_sf.h [XFS] endianess annotations for xfs_attr_shortform_t 2006-03-17 17:29:25 +11:00
xfs_bit.c [XFS] Undo bit ops cleanup mod due to regression on 32-bit powermac 2008-02-26 17:05:44 +11:00
xfs_bit.h [XFS] Undo bit ops cleanup mod due to regression on 32-bit powermac 2008-02-26 17:05:44 +11:00
xfs_bmap.c [XFS] actually check error returned by xfs_flush_pages, clean up and 2008-04-18 11:34:47 +10:00
xfs_bmap.h [XFS] Fix up sparse warnings. 2008-02-07 18:14:38 +11:00
xfs_bmap_btree.c xfs: convert beX_add to beX_add_cpu (new common API) 2008-02-13 16:21:19 -08:00
xfs_bmap_btree.h [XFS] remove shouting-indirection macros from xfs_sb.h 2008-04-10 16:24:45 +10:00
xfs_btree.c [XFS] endianess annotations for xfs_bmbt_key Trivial as there are no 2006-09-28 10:58:17 +10:00
xfs_btree.h [XFS] Fix up sparse warnings. 2008-02-07 18:14:38 +11:00
xfs_buf_item.c [XFS] Unwrap AIL_LOCK 2008-02-07 16:44:23 +11:00
xfs_buf_item.h [XFS] Fix up sparse warnings. 2008-02-07 18:14:38 +11:00
xfs_clnt.h [XFS] If you mount an XFS filesystem with no mount options at all, then 2008-02-28 20:37:56 -08:00
xfs_da_btree.c xfs: convert beX_add to beX_add_cpu (new common API) 2008-02-13 16:21:19 -08:00
xfs_da_btree.h [XFS] Fix up sparse warnings. 2008-02-07 18:14:38 +11:00
xfs_dfrag.c [XFS] stop re-checking permissions in xfs_swapext 2008-02-07 18:22:24 +11:00
xfs_dfrag.h [XFS] Add parameters to xfs_bmapi() and xfs_bunmapi() to have them report 2006-06-09 14:48:12 +10:00
xfs_dinode.h [XFS] Remove CFORK macros and use code directly in IFORK and DFORK macros. 2008-02-07 18:19:24 +11:00
xfs_dir2.c [XFS] remove shouting-indirection macros from xfs_sb.h 2008-04-10 16:24:45 +10:00
xfs_dir2.h [XFS] decontaminate vnode operations from behavior details 2007-10-15 16:54:29 +10:00
xfs_dir2_block.c xfs: convert beX_add to beX_add_cpu (new common API) 2008-02-13 16:21:19 -08:00
xfs_dir2_block.h [XFS] use filldir internally 2007-10-15 16:49:49 +10:00
xfs_dir2_data.c xfs: convert beX_add to beX_add_cpu (new common API) 2008-02-13 16:21:19 -08:00
xfs_dir2_data.h [XFS] Reduce shouting by removing unnecessary macros from dir2 code. 2007-07-14 15:37:02 +10:00
xfs_dir2_leaf.c xfs: convert beX_add to beX_add_cpu (new common API) 2008-02-13 16:21:19 -08:00
xfs_dir2_leaf.h [XFS] use filldir internally 2007-10-15 16:49:49 +10:00
xfs_dir2_node.c xfs: convert beX_add to beX_add_cpu (new common API) 2008-02-13 16:21:19 -08:00
xfs_dir2_node.h [XFS] Reduce shouting by removing unnecessary macros from dir2 code. 2007-07-14 15:37:02 +10:00
xfs_dir2_sf.c [XFS] Put the correct offset in dirent d_off 2007-12-18 17:16:23 +11:00
xfs_dir2_sf.h [XFS] use filldir internally 2007-10-15 16:49:49 +10:00
xfs_dir2_trace.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_dir2_trace.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_dmapi.h [XFS] kill the vfs_flags member in struct bhv_vfs 2007-10-16 11:45:57 +10:00
xfs_dmops.c [XFS] fixups after behavior removal merge into mainline git 2007-10-19 17:14:45 +10:00
xfs_error.c [XFS] lose xfs_hex_dump in favor of print_hex_dump 2008-02-07 18:13:05 +11:00
xfs_error.h [XFS] lose xfs_hex_dump in favor of print_hex_dump 2008-02-07 18:13:05 +11:00
xfs_extfree_item.c [XFS] Unwrap AIL_LOCK 2008-02-07 16:44:23 +11:00
xfs_extfree_item.h [XFS] cleanup the field types of some item format structures 2006-09-28 10:55:43 +10:00
xfs_filestream.c [XFS] Fix up sparse warnings. 2008-02-07 18:14:38 +11:00
xfs_filestream.h [XFS] Concurrent Multi-File Data Streams 2007-07-14 15:40:53 +10:00
xfs_fs.h [XFS] fix 32-bit compat ioctls for GETXFLAGS, SETXFLAGS, GETVERSION 2008-02-07 18:13:17 +11:00
xfs_fsops.c [XFS] remove shouting-indirection macros from xfs_sb.h 2008-04-10 16:24:45 +10:00
xfs_fsops.h [XFS] Write log dummy record when freezing filesystem 2006-01-11 15:30:08 +11:00
xfs_ialloc.c [XFS] remove shouting-indirection macros from xfs_sb.h 2008-04-10 16:24:45 +10:00
xfs_ialloc.h [XFS] Pick a single default inode cluster size. 2007-10-15 16:39:35 +10:00
xfs_ialloc_btree.c xfs: convert beX_add to beX_add_cpu (new common API) 2008-02-13 16:21:19 -08:00
xfs_ialloc_btree.h [XFS] kill XFS_INOBT_IS_FREE_DISK 2008-02-07 18:12:41 +11:00
xfs_iget.c [XFS] Remove the xfs_icluster structure 2008-04-18 11:37:41 +10:00
xfs_imap.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_inode.c [XFS] Use xfs_inode_clean() in more places 2008-04-18 11:37:51 +10:00
xfs_inode.h [XFS] Remove the xfs_icluster structure 2008-04-18 11:37:41 +10:00
xfs_inode_item.c [XFS] remove shouting-indirection macros from xfs_sb.h 2008-04-10 16:24:45 +10:00
xfs_inode_item.h [XFS] Use xfs_inode_clean() in more places 2008-04-18 11:37:51 +10:00
xfs_inum.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_iomap.c [XFS] optimize XFS_IS_REALTIME_INODE w/o realtime config 2008-02-07 18:16:43 +11:00
xfs_iomap.h [XFS] kill unnessecary ioops indirection 2008-02-07 16:44:14 +11:00
xfs_itable.c [XFS] Don't block pdflush when writing back inodes 2008-04-18 11:37:32 +10:00
xfs_itable.h [XFS] Fix XFS_IOC_FSBULKSTAT{,_SINGLE} & XFS_IOC_FSINUMBERS in compat mode 2007-07-14 15:42:50 +10:00
xfs_log.c [XFS] Use atomics for iclog reference counting 2008-04-18 11:38:10 +10:00
xfs_log.h [XFS] xlog_rec_header/xlog_rec_ext_header endianess annotations 2008-02-07 18:11:47 +11:00
xfs_log_priv.h [XFS] Use atomics for iclog reference counting 2008-04-18 11:38:10 +10:00
xfs_log_recover.c [XFS] Don't block pdflush when writing back inodes 2008-04-18 11:37:32 +10:00
xfs_log_recover.h [XFS] Update license/copyright notices to match the prefered SGI 2005-11-02 14:58:39 +11:00
xfs_mount.c [XFS] Ensure "both" features2 slots are consistent 2008-04-10 16:25:26 +10:00
xfs_mount.h [XFS] kill xfs_rwlock/xfs_rwunlock 2008-04-18 11:39:25 +10:00
xfs_mru_cache.c [XFS] Fix up sparse warnings. 2008-02-07 18:14:38 +11:00
xfs_mru_cache.h [XFS] On-demand reaping of the MRU cache 2007-09-17 16:42:02 +10:00
xfs_qmops.c [XFS] Unwrap XFS_SB_LOCK. 2008-02-07 16:47:15 +11:00
xfs_quota.h [XFS] remove dependency of the quota module on behaviors 2007-10-16 11:43:26 +10:00
xfs_refcache.h [XFS] Cleanup cosmetic differences between source trees. 2005-11-03 16:14:31 +11:00
xfs_rename.c [XFS] kill xfs_get_dir_entry 2008-04-18 11:39:14 +10:00
xfs_rtalloc.c [XFS] Undo bit ops cleanup mod due to regression on 32-bit powermac 2008-02-26 17:05:44 +11:00
xfs_rtalloc.h [XFS] optimize XFS_IS_REALTIME_INODE w/o realtime config 2008-02-07 18:16:43 +11:00
xfs_rw.c [XFS] decontaminate vfs operations from behavior details 2007-10-16 11:43:55 +10:00
xfs_rw.h [XFS] optimize XFS_IS_REALTIME_INODE w/o realtime config 2008-02-07 18:16:43 +11:00
xfs_sb.h [XFS] Ensure "both" features2 slots are consistent 2008-04-10 16:25:26 +10:00
xfs_trans.c xfs: convert beX_add to beX_add_cpu (new common API) 2008-02-13 16:21:19 -08:00
xfs_trans.h [XFS] Move AIL pushing into it's own thread 2008-02-07 18:22:51 +11:00
xfs_trans_ail.c [XFS] 977545 977545 977545 977545 977545 977545 xfsaild causing too many 2008-03-06 16:38:17 +11:00
xfs_trans_buf.c [XFS] Don't block pdflush when writing back inodes 2008-04-18 11:37:32 +10:00
xfs_trans_extfree.c [XFS] Radix tree based inode caching 2007-10-15 16:50:50 +10:00
xfs_trans_inode.c [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_trans_item.c [XFS] Fix up sparse warnings. 2008-02-07 18:14:38 +11:00
xfs_trans_priv.h [XFS] Move AIL pushing into it's own thread 2008-02-07 18:22:51 +11:00
xfs_trans_space.h [XFS] Remove version 1 directory code. Never functioned on Linux, just 2006-06-20 13:04:51 +10:00
xfs_types.h [XFS] use filldir internally 2007-10-15 16:49:49 +10:00
xfs_utils.c [XFS] kill xfs_get_dir_entry 2008-04-18 11:39:14 +10:00
xfs_utils.h [XFS] kill xfs_get_dir_entry 2008-04-18 11:39:14 +10:00
xfs_vfsops.c [XFS] Remove the xfs_icluster structure 2008-04-18 11:37:41 +10:00
xfs_vfsops.h [XFS] kill xfs_root 2008-02-07 18:24:00 +11:00
xfs_vnodeops.c [XFS] Update c/mtime correctly on truncates 2008-04-18 11:39:45 +10:00
xfs_vnodeops.h [XFS] kill xfs_rwlock/xfs_rwunlock 2008-04-18 11:39:25 +10:00