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Mingming Cao 21fe3471c3 [PATCH] ext3: reduce allocate-with-reservation lock latencies 
Currently in ext3 block reservation code, the global filesystem reservation
tree lock (rsv_block) is hold during the process of searching for a space
to make a new reservation window, including while scaning the block bitmap
to verify if the avalible window has a free block.  Holding the lock during
bitmap scan is unnecessary and could possibly cause scalability issue and
latency issues.

This patch tries to address this by dropping the lock before scan the
bitmap.  Before that we need to reserve the open window in case someone
else is targetting at the same window.  Question was should we reserve the
whole free reservable space or just the window size we need.  Reserve the
whole free reservable space will possibly force other threads which
intended to do block allocation nearby move to another block group(cause
bad layout).  In this patch, we just reserve the desired size before drop
the lock and scan the block bitmap.  This patch fixed a ext3 reservation
latency issue seen on a cvs check out test.  Patch is tested with many fsx,
tiobench, dbench and untar a kernel test.

Signed-Off-By: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
 		2005-06-28 21:20:35 -07:00
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adfs
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affs
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afs [PATCH] Cleanup patch for process freezing 2005-06-25 17:10:13 -07:00
autofs
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autofs4 [PATCH] autofs4: bad lookup fix 2005-06-21 19:07:35 -07:00
befs
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bfs
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cifs [CIFS] Fix cifs update of page cache. Write at correct offset when out of memory 2005-06-09 14:44:07 -07:00
coda [PATCH] class: convert the remaining class_simple users in the kernel to usee the new class api 2005-06-20 15:15:11 -07:00
cramfs
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debugfs [PATCH] remove duplicate get_dentry functions in various places 2005-06-23 09:45:20 -07:00
devfs
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devpts
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efs
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exportfs
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ext2 [PATCH] xip: reduce code duplication 2005-06-24 00:06:41 -07:00
ext3 [PATCH] ext3: reduce allocate-with-reservation lock latencies 2005-06-28 21:20:35 -07:00
fat
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freevxfs
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hfs [PATCH] hfs, hfsplus: don't leak s_fs_info and fix an oops 2005-05-01 08:59:16 -07:00
hfsplus [PATCH] hfs, hfsplus: don't leak s_fs_info and fix an oops 2005-05-01 08:59:16 -07:00
hostfs [PATCH] uml: remove 2_5compat.h 2005-05-28 16:46:11 -07:00
hpfs
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hppfs
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hugetlbfs [PATCH] Avoiding mmap fragmentation 2005-06-21 18:46:16 -07:00
isofs [PATCH] isofs: show hidden files, add granularity for assoc/hidden files flags 2005-06-21 19:07:38 -07:00
jbd [PATCH] Cleanup patch for process freezing 2005-06-25 17:10:13 -07:00
jffs [PATCH] fs/jffs/: cleanups 2005-06-25 16:25:04 -07:00
jffs2 [PATCH] jffs2 build fix 2005-06-26 08:43:19 -07:00
jfs [PATCH] Cleanup patch for process freezing 2005-06-25 17:10:13 -07:00
lockd [PATCH] Cleanup patch for process freezing 2005-06-25 17:10:13 -07:00
minix
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msdos
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ncpfs [PATCH] fs/ncpfs/: remove unused #ifdef USE_OLD_SLOW_DIRECTORY_LISTING code 2005-06-25 16:25:04 -07:00
nfs [PATCH] really remove xattr_acl.h 2005-06-28 21:20:31 -07:00
nfs_common [PATCH] NFSD: Add server support for NFSv3 ACLs. 2005-06-22 16:07:23 -04:00
nfsd [PATCH] really remove xattr_acl.h 2005-06-28 21:20:31 -07:00
nls [PATCH] make some things static 2005-05-05 16:36:47 -07:00
ntfs
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openpromfs
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partitions [PATCH] small partitions/msdos cleanups 2005-06-25 16:24:59 -07:00
proc [PATCH] kdump: Parse elf32 headers and export through /proc/vmcore 2005-06-25 16:24:53 -07:00
qnx4 [PATCH] fs/qnx4/*: fix sparse warnings 2005-06-24 14:14:24 -07:00
ramfs
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reiserfs [PATCH] Update cfq io scheduler to time sliced design 2005-06-27 14:33:29 -07:00
romfs
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smbfs
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sysfs [PATCH] DocBook: update comments 2005-06-24 00:06:40 -07:00
sysv
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udf [PATCH] coverity: fs/udf/namei.c null check 2005-06-28 21:20:33 -07:00
ufs
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umsdos
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vfat
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xfs [PATCH] Cleanup patch for process freezing 2005-06-25 17:10:13 -07:00
Kconfig [PATCH] kdump: Access dump file in elf format (/proc/vmcore) 2005-06-25 16:24:53 -07:00
Kconfig.binfmt
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Makefile [PATCH] Update cfq io scheduler to time sliced design 2005-06-27 14:33:29 -07:00
aio.c [PATCH] aio-retry-fix: fix aio retry work queueing 2005-06-28 21:20:32 -07:00
attr.c
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bad_inode.c [PATCH] make some things static 2005-05-05 16:36:47 -07:00
binfmt_aout.c [PATCH] Avoiding mmap fragmentation 2005-06-21 18:46:16 -07:00
binfmt_elf.c [PATCH] Avoiding mmap fragmentation 2005-06-21 18:46:16 -07:00
binfmt_elf_fdpic.c
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binfmt_em86.c
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binfmt_flat.c [PATCH] binfmt_flat mmap flag fix 2005-06-06 14:57:51 -07:00
binfmt_misc.c
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binfmt_script.c
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binfmt_som.c
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bio.c [PATCH] DocBook: fix some descriptions 2005-05-01 08:59:26 -07:00
block_dev.c [PATCH] block: add unlocked_ioctl support for block devices 2005-06-23 09:45:32 -07:00
buffer.c [PATCH] rename wakeup_bdflush to wakeup_pdflush 2005-06-28 21:20:31 -07:00
char_dev.c [PATCH] fix semaphore handling in __unregister_chrdev_region 2005-06-28 21:20:29 -07:00
compat.c
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compat_ioctl.c
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dcache.c [PATCH] make some things static 2005-05-05 16:36:47 -07:00
dcookies.c
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direct-io.c [PATCH] pass iocb to dio_iodone_t 2005-06-24 00:05:19 -07:00
dnotify.c
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dquot.c [PATCH] list_for_each_entry: fs-dquot.c 2005-06-25 16:25:11 -07:00
eventpoll.c [PATCH] Remove eventpoll macro obfuscation 2005-06-23 09:45:30 -07:00
exec.c [PATCH] setuid core dump 2005-06-23 09:45:26 -07:00
fcntl.c [PATCH] convert that currently tests _NSIG directly to use valid_signal() 2005-05-01 08:59:14 -07:00
fifo.c
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file.c
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file_table.c [PATCH] Fix of bogus file max limit messages 2005-06-23 09:45:26 -07:00
filesystems.c
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fs-writeback.c [PATCH] O(1) sb list traversing on syncs 2005-06-23 09:45:27 -07:00
inode.c [PATCH] fix for prune_icache()/forced final iput() races 2005-06-23 09:45:17 -07:00
ioctl.c
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ioprio.c [PATCH] Update cfq io scheduler to time sliced design 2005-06-27 14:33:29 -07:00
libfs.c [PATCH] fix fsync(dir) return value for ram-based filesystems 2005-06-25 16:24:38 -07:00
locks.c [PATCH] VFS: Ensure that all the on-stack struct file_lock call fl_release_private 2005-06-22 16:07:40 -04:00
mbcache.c [PATCH] make some things static 2005-05-05 16:36:47 -07:00
mpage.c [PATCH] mpage_end_io_write() I/O error handling fix 2005-06-04 17:12:59 -07:00
namei.c [PATCH] add some comments to lookup_create() 2005-06-23 09:45:26 -07:00
namespace.c [PATCH] make various thing static 2005-06-24 00:06:43 -07:00
nfsctl.c
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open.c [PATCH] xip: fs/mm: execute in place 2005-06-24 00:06:41 -07:00
pipe.c
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posix_acl.c
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quota.c [PATCH] O(1) sb list traversing on syncs 2005-06-23 09:45:27 -07:00
quota_v1.c
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quota_v2.c
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read_write.c [PATCH] aio: fix do_sync_(read|write) to properly handle aio retries 2005-06-23 09:45:34 -07:00
readdir.c
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select.c [PATCH] make some things static 2005-05-05 16:36:47 -07:00
seq_file.c [PATCH] DocBook: fix some descriptions 2005-05-01 08:59:26 -07:00
stat.c
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super.c [PATCH] O(1) sb list traversing on syncs 2005-06-23 09:45:27 -07:00
xattr.c
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xattr_acl.c
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