Chris Mason d313d7a31a Btrfs: add a priority queue to the async thread helpers ... Btrfs is using WRITE_SYNC_PLUG to send down synchronous IOs with a higher priority. But, the checksumming helper threads prevent it from being fully effective. There are two problems. First, a big queue of pending checksumming will delay the synchronous IO behind other lower priority writes. Second, the checksumming uses an ordered async work queue. The ordering makes sure that IOs are sent to the block layer in the same order they are sent to the checksumming threads. Usually this gives us less seeky IO. But, when we start mixing IO priorities, the lower priority IO can delay the higher priority IO. This patch solves both problems by adding a high priority list to the async helper threads, and a new btrfs_set_work_high_prio(), which is used to make put a new async work item onto the higher priority list. The ordering is still done on high priority IO, but all of the high priority bios are ordered separately from the low priority bios. This ordering is purely an IO optimization, it is not involved in data or metadata integrity. Signed-off-by: Chris Mason <chris.mason@oracle.com>		2009-04-20 15:53:08 -04:00
..
acl.c	New helper - current_umask()	2009-03-31 23:00:26 -04:00
async-thread.c	Btrfs: add a priority queue to the async thread helpers	2009-04-20 15:53:08 -04:00
async-thread.h	Btrfs: add a priority queue to the async thread helpers	2009-04-20 15:53:08 -04:00
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: BUG to BUG_ON changes	2009-04-02 17:05:11 -04:00
ctree.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable	2009-04-03 15:14:44 -07:00
delayed-ref.c	Btrfs: remove unused ftrace include	2009-04-02 17:02:55 -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 a priority queue to the async thread helpers	2009-04-20 15:53:08 -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: add a priority queue to the async thread helpers	2009-04-20 15:53:08 -04:00
extent_io.h	Btrfs: leave btree locks spinning more often	2009-03-24 16:14:28 -04:00
extent_map.c	Btrfs: remove dead code	2009-04-02 16:46:06 -04:00
extent_map.h	Btrfs: Fix csum error for compressed data	2008-11-10 07:34:43 -05:00
extent-tree.c	Btrfs: rework allocation clustering	2009-04-03 09:47:43 -04:00
file-item.c	Btrfs: leave btree locks spinning more often	2009-03-24 16:14:28 -04:00
file.c	Btrfs: add a priority queue to the async thread helpers	2009-04-20 15:53:08 -04:00
free-space-cache.c	Btrfs: BUG to BUG_ON changes	2009-04-02 17:05:11 -04:00
free-space-cache.h	Btrfs: rework allocation clustering	2009-04-03 09:47:43 -04:00
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	Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable	2009-04-03 15:14:44 -07:00
ioctl.c	New helper - current_umask()	2009-03-31 23:00:26 -04:00
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: fix typos in comments	2009-04-02 16:46:06 -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: use WRITE_SYNC for synchronous writes	2009-04-20 15:53:08 -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: add flushoncommit mount option	2009-04-02 16:59:01 -04:00
sysfs.c	Btrfs: Fix checkpatch.pl warnings	2009-01-05 21:25:51 -05:00
transaction.c	Btrfs: add flushoncommit mount option	2009-04-02 16:59:01 -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: BUG to BUG_ON changes	2009-04-02 17:05:11 -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: use WRITE_SYNC for synchronous writes	2009-04-20 15:53:08 -04:00
volumes.h	Btrfs: use WRITE_SYNC for synchronous writes	2009-04-20 15:53:08 -04:00
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