Miao Xie 21c7e75654 Btrfs: reclaim the reserved metadata space at background ... Before applying this patch, the task had to reclaim the metadata space by itself if the metadata space was not enough. And When the task started the space reclamation, all the other tasks which wanted to reserve the metadata space were blocked. At some cases, they would be blocked for a long time, it made the performance fluctuate wildly. So we introduce the background metadata space reclamation, when the space is about to be exhausted, we insert a reclaim work into the workqueue, the worker of the workqueue helps us to reclaim the reserved space at the background. By this way, the tasks needn't reclaim the space by themselves at most cases, and even if the tasks have to reclaim the space or are blocked for the space reclamation, they will get enough space more quickly. Here is my test result(Tested by compilebench): Memory: 2GB CPU: 2Cores * 1CPU Partition: 40GB(SSD) Test command: # compilebench -D <mnt> -m Without this patch: intial create total runs 30 avg 54.36 MB/s (user 0.52s sys 2.44s) compile total runs 30 avg 123.72 MB/s (user 0.13s sys 1.17s) read compiled tree total runs 3 avg 81.15 MB/s (user 0.74s sys 4.89s) delete compiled tree total runs 30 avg 5.32 seconds (user 0.35s sys 4.37s) With this patch: intial create total runs 30 avg 59.80 MB/s (user 0.52s sys 2.53s) compile total runs 30 avg 151.44 MB/s (user 0.13s sys 1.11s) read compiled tree total runs 3 avg 83.25 MB/s (user 0.76s sys 4.91s) delete compiled tree total runs 30 avg 5.29 seconds (user 0.34s sys 4.34s) Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>		2014-06-09 17:20:34 -07:00
..
tests	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2014-01-30 20:08:20 -08:00
acl.c	btrfs: remove dead code	2014-01-28 13:19:50 -08:00
async-thread.c	btrfs: fix crash in remount(thread_pool=) case	2014-04-07 10:41:52 -07:00
async-thread.h	btrfs: Add trace for btrfs_workqueue alloc/destroy	2014-03-20 17:15:28 -07:00
backref.c	Btrfs: remove transaction from send	2014-04-06 17:39:30 -07:00
backref.h	Btrfs: allocate prelim_ref with a slab allocater	2013-09-01 08:16:27 -04:00
btrfs_inode.h	Btrfs: use signed integer instead of unsigned long integer for log transid	2014-03-10 15:16:42 -04:00
check-integrity.c	btrfs: check_int: propagate out-of-memory error upwards	2014-06-09 17:20:21 -07:00
check-integrity.h	block: submit_bio_wait() conversions	2013-11-24 16:33:41 -07:00
compression.c	btrfs: return ptr error from compression workspace	2014-06-09 17:20:22 -07:00
compression.h	btrfs: make static code static & remove dead code	2013-05-06 15:55:23 -04:00
ctree.c	Btrfs: hold the commit_root_sem when getting the commit root during send	2014-04-07 09:08:39 -07:00
ctree.h	Btrfs: reclaim the reserved metadata space at background	2014-06-09 17:20:34 -07:00
delayed-inode.c	btrfs: Cleanup the "_struct" suffix in btrfs_workequeue	2014-03-10 15:17:16 -04:00
delayed-inode.h	Btrfs: introduce the delayed inode ref deletion for the single link inode	2014-01-28 13:20:09 -08:00
delayed-ref.c	Btrfs: fix race when updating existing ref head	2014-03-20 17:15:28 -07:00
delayed-ref.h	Btrfs: attach delayed ref updates to delayed ref heads	2014-01-28 13:20:25 -08:00
dev-replace.c	Btrfs: don't flush all delalloc inodes when we doesn't get s_umount lock	2014-03-10 15:17:27 -04:00
dev-replace.h	Btrfs: add new sources for device replace code	2012-12-12 17:15:41 -05:00
dir-item.c	Btrfs: convert printk to btrfs_ and fix BTRFS prefix	2014-01-28 13:20:05 -08:00
disk-io.c	Btrfs: reclaim the reserved metadata space at background	2014-06-09 17:20:34 -07:00
disk-io.h	Btrfs: add a sanity test for btrfs_split_item	2013-11-11 21:51:02 -05:00
export.c	btrfs: remove fs/btrfs/compat.h	2013-11-11 22:03:19 -05:00
export.h
extent-tree.c	Btrfs: reclaim the reserved metadata space at background	2014-06-09 17:20:34 -07:00
extent_io.c	Btrfs: fix hang on error (such as ENOSPC) when writing extent pages	2014-06-09 17:20:20 -07:00
extent_io.h	Btrfs: don't clear uptodate if the eb is under IO	2014-04-06 17:34:37 -07:00
extent_map.c	Btrfs: more efficient btrfs_drop_extent_cache	2014-03-10 15:16:57 -04:00
extent_map.h	Btrfs: more efficient btrfs_drop_extent_cache	2014-03-10 15:16:57 -04:00
file-item.c	Btrfs: do not increment on bio_index one by one	2014-06-09 17:20:25 -07:00
file.c	Btrfs: fix leaf corruption caused by ENOSPC while hole punching	2014-06-09 17:20:26 -07:00
free-space-cache.c	Btrfs: output warning instead of error when loading free space cache failed	2014-06-09 17:20:33 -07:00
free-space-cache.h	Btrfs: remove path arg from btrfs_truncate_free_space_cache	2013-11-11 21:51:33 -05:00
hash.c	Btrfs: fix btrfs boot when compiled as built-in	2014-01-28 13:20:31 -08:00
hash.h	Btrfs: fix btrfs boot when compiled as built-in	2014-01-28 13:20:31 -08:00
inode-item.c	btrfs: cleanup: removed unused 'btrfs_get_inode_ref_index'	2014-01-28 13:19:39 -08:00
inode-map.c	Btrfs: fix inode caching vs tree log	2014-04-24 16:43:33 -07:00
inode-map.h
inode.c	btrfs: remove redundant null check in btrfs_dentry_release()	2014-06-09 17:20:31 -07:00
ioctl.c	btrfs: assert that send is not in progres before root deletion	2014-06-09 17:20:32 -07:00
Kconfig	Btrfs: fix btrfs boot when compiled as built-in	2014-01-28 13:20:31 -08:00
locking.c	btrfs: make static code static & remove dead code	2013-05-06 15:55:23 -04:00
locking.h	Btrfs: remove btrfs_try_spin_lock	2013-03-14 14:57:10 -04:00
lzo.c	btrfs: return errno instead of -1 from compression	2014-06-09 17:20:21 -07:00
Makefile	Btrfs: fix btrfs boot when compiled as built-in	2014-01-28 13:20:31 -08:00
math.h	Btrfs: cleanup duplicated division functions	2012-12-11 13:31:30 -05:00
ordered-data.c	Btrfs: split the global ordered extents mutex	2014-03-10 15:17:28 -04:00
ordered-data.h	btrfs: Cleanup the "_struct" suffix in btrfs_workequeue	2014-03-10 15:17:16 -04:00
orphan.c	btrfs: expand btrfs_find_item() to include find_orphan_item functionality	2014-01-28 13:19:37 -08:00
print-tree.c	Btrfs: don't use ram_bytes for uncompressed inline items	2014-01-29 07:06:29 -08:00
print-tree.h	btrfs: make static code static & remove dead code	2013-05-06 15:55:23 -04:00
props.c	Btrfs: add support for inode properties	2014-01-28 13:20:24 -08:00
props.h	Btrfs: add support for inode properties	2014-01-28 13:20:24 -08:00
qgroup.c	btrfs: Cleanup the "_struct" suffix in btrfs_workequeue	2014-03-10 15:17:16 -04:00
raid56.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2014-04-04 15:31:36 -07:00
raid56.h	Btrfs: RAID5 and RAID6	2013-02-01 14:24:23 -05:00
rcu-string.h
reada.c	btrfs: Cleanup the "_struct" suffix in btrfs_workequeue	2014-03-10 15:17:16 -04:00
relocation.c	Btrfs: do not reset last_snapshot after relocation	2014-04-06 17:34:35 -07:00
root-tree.c	btrfs: Use PTR_ERR_OR_ZERO	2014-03-10 15:16:51 -04:00
scrub.c	btrfs: Remove unnecessary check for NULL	2014-06-09 17:20:23 -07:00
send.c	btrfs: protect snapshots from deleting during send	2014-06-09 17:20:31 -07:00
send.h	btrfs: make static code static & remove dead code	2013-05-06 15:55:23 -04:00
struct-funcs.c
super.c	Btrfs: reclaim the reserved metadata space at background	2014-06-09 17:20:34 -07:00
sysfs.c	btrfs: export more from FS_INFO to sysfs	2014-06-09 17:20:28 -07:00
sysfs.h	btrfs: add simple debugfs interface	2014-03-10 15:15:51 -04:00
transaction.c	btrfs: assert that send is not in progres before root deletion	2014-06-09 17:20:32 -07:00
transaction.h	Btrfs: remove transaction from send	2014-04-06 17:39:30 -07:00
tree-defrag.c	Btrfs: cleanup dead code of defragment	2013-11-11 21:59:45 -05:00
tree-log.c	Btrfs: stop joining the log transaction if sync log fails	2014-03-10 15:16:44 -04:00
tree-log.h	Btrfs: just wait or commit our own log sub-transaction	2014-03-10 15:16:43 -04:00
ulist.c	Btrfs: do not export ulist functions	2014-01-29 07:06:27 -08:00
ulist.h	Btrfs: do not export ulist functions	2014-01-29 07:06:27 -08:00
uuid-tree.c	Btrfs: convert printk to btrfs_ and fix BTRFS prefix	2014-01-28 13:20:05 -08:00
volumes.c	btrfs: Add ctime/mtime update for btrfs device add/remove.	2014-06-09 17:20:33 -07:00
volumes.h	btrfs: balance filter: add limit of processed chunks	2014-06-09 17:20:26 -07:00
xattr.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2014-01-30 20:08:20 -08:00
xattr.h	btrfs: use generic posix ACL infrastructure	2014-01-25 23:58:18 -05:00
zlib.c	btrfs: return errno instead of -1 from compression	2014-06-09 17:20:21 -07:00