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Chris Mason bedf762ba3 Btrfs: unplug in the async bio submission threads 
Btrfs pages being written get set to writeback, and then may go through
a number of steps before they hit the block layer.  This includes compression,
checksumming and async bio submission.

The end result is that someone who writes a page and then does
wait_on_page_writeback is likely to unplug the queue before the bio they
cared about got there.

We could fix this by marking bios sync, or by doing more frequent unplugs,
but this commit just changes the async bio submission code to unplug
after it has processed all the bios for a device.  The async bio submission
does a fair job of collection bios, so this shouldn't be a huge problem
for reducing merging at the elevator.

For streaming O_DIRECT writes on a 5 drive array, it boosts performance
from 386MB/s to 460MB/s.

Thanks to Hisashi Hifumi for helping with this work.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-04-03 10:32:58 -04:00
..
acl.c Btrfs: Fix checkpatch.pl warnings 2009-01-05 21:25:51 -05:00
async-thread.c Btrfs: async threads should try harder to find work 2009-02-04 09:23:24 -05:00
async-thread.h Btrfs: Add ordered async work queues 2008-11-06 22:03:00 -05:00
btrfs_inode.h Btrfs: add extra flushing for renames and truncates 2009-03-31 14:27:58 -04:00
compat.h Btrfs: drop remaining LINUX_KERNEL_VERSION checks and compat code 2009-01-06 09:38:55 -05:00
compression.c Btrfs: removed unused #include <version.h>'s 2009-01-21 10:49:16 -05:00
compression.h Btrfs: Add zlib compression support 2008-10-29 14:49:59 -04:00
crc32c.h Btrfs: Drop the hardware crc32c asm code 2009-01-07 19:56:59 -05:00
ctree.c Btrfs: limit balancing work while flushing delayed refs 2009-03-24 16:14:51 -04:00
ctree.h Btrfs: add extra flushing for renames and truncates 2009-03-31 14:27:58 -04:00
delayed-ref.c Btrfs: make sure btrfs_update_delayed_ref doesn't increase ref_mod 2009-03-25 09:55:11 -04:00
delayed-ref.h Btrfs: make sure btrfs_update_delayed_ref doesn't increase ref_mod 2009-03-25 09:55:11 -04:00
dir-item.c Btrfs: leave btree locks spinning more often 2009-03-24 16:14:28 -04:00
disk-io.c Btrfs: add extra flushing for renames and truncates 2009-03-31 14:27:58 -04:00
disk-io.h Btrfs: leave btree locks spinning more often 2009-03-24 16:14:28 -04:00
export.c Btrfs: Fix checkpatch.pl warnings 2009-01-05 21:25:51 -05:00
export.h NFS support for btrfs - v3 2008-09-25 11:04:06 -04:00
extent_io.c Btrfs: leave btree locks spinning more often 2009-03-24 16:14:28 -04:00
extent_io.h Btrfs: leave btree locks spinning more often 2009-03-24 16:14:28 -04:00
extent_map.c Btrfs: removed unused #include <version.h>'s 2009-01-21 10:49:16 -05:00
extent_map.h Btrfs: Fix csum error for compressed data 2008-11-10 07:34:43 -05:00
extent-tree.c Btrfs: try to free metadata pages when we free btree blocks 2009-03-31 14:27:58 -04:00
file-item.c Btrfs: leave btree locks spinning more often 2009-03-24 16:14:28 -04:00
file.c Btrfs: add extra flushing for renames and truncates 2009-03-31 14:27:58 -04:00
free-space-cache.c Btrfs: Fix checkpatch.pl warnings 2009-01-05 21:25:51 -05:00
hash.h Switch btrfs_name_hash() to crc32c 2008-09-25 11:04:06 -04:00
inode-item.c Btrfs: leave btree locks spinning more often 2009-03-24 16:14:28 -04:00
inode-map.c Btrfs: remove btrfs_init_path 2009-02-12 14:11:25 -05:00
inode.c Btrfs: add extra flushing for renames and truncates 2009-03-31 14:27:58 -04:00
ioctl.c Btrfs: add better -ENOSPC handling 2009-02-20 11:00:09 -05:00
ioctl.h Btrfs: fix ioctl arg size (userland incompatible change!) 2009-01-16 11:59:08 -05:00
Kconfig Btrfs: make btrfs acls selectable 2009-02-04 09:28:28 -05:00
locking.c Btrfs: leave btree locks spinning more often 2009-03-24 16:14:28 -04:00
locking.h Btrfs: fix spinlock assertions on UP systems 2009-03-09 11:45:38 -04:00
Makefile Btrfs: do extent allocation and reference count updates in the background 2009-03-24 16:14:25 -04:00
ordered-data.c Btrfs: add extra flushing for renames and truncates 2009-03-31 14:27:58 -04:00
ordered-data.h Btrfs: add extra flushing for renames and truncates 2009-03-31 14:27:58 -04:00
orphan.c Btrfs: Create orphan inode records to prevent lost files after a crash 2008-09-25 11:04:05 -04:00
print-tree.c Btrfs: Fix checkpatch.pl warnings 2009-01-05 21:25:51 -05:00
print-tree.h Btrfs: Create extent_buffer interface for large blocksizes 2008-09-25 11:03:56 -04:00
ref-cache.c Btrfs: Make btrfs_drop_snapshot work in larger and more efficient chunks 2009-02-04 09:27:02 -05:00
ref-cache.h Btrfs: Make btrfs_drop_snapshot work in larger and more efficient chunks 2009-02-04 09:27:02 -05:00
root-tree.c Btrfs: Fix checkpatch.pl warnings 2009-01-05 21:25:51 -05:00
struct-funcs.c Btrfs: Fix checkpatch.pl warnings 2009-01-05 21:25:51 -05:00
super.c Btrfs: don't clean old snapshots on sync(1) 2009-02-12 09:45:08 -05:00
sysfs.c Btrfs: Fix checkpatch.pl warnings 2009-01-05 21:25:51 -05:00
transaction.c Btrfs: add extra flushing for renames and truncates 2009-03-31 14:27:58 -04:00
transaction.h Btrfs: reduce stalls during transaction commit 2009-03-24 16:14:26 -04:00
tree-defrag.c Btrfs: do extent allocation and reference count updates in the background 2009-03-24 16:14:25 -04:00
tree-log.c Btrfs: optimize fsyncs on old files 2009-03-24 16:14:52 -04:00
tree-log.h Btrfs: tree logging unlink/rename fixes 2009-03-24 16:14:52 -04:00
version.h Update Btrfs files for in-kernel usage 2008-09-25 15:41:59 -04:00
version.sh Btrfs: Fixes for 2.6.28-rc API changes 2008-11-19 21:17:22 -05:00
volumes.c Btrfs: unplug in the async bio submission threads 2009-04-03 10:32:58 -04:00
volumes.h Btrfs: shared seed device 2008-12-12 10:03:26 -05:00
xattr.c Btrfs: selinux support 2009-02-04 09:29:13 -05:00
xattr.h Btrfs: selinux support 2009-02-04 09:29:13 -05:00
zlib.c Btrfs: Fix checkpatch.pl warnings 2009-01-05 21:25:51 -05:00