Chris Mason b765ead57d Btrfs: keep processing bios for a given bdev if our proc is batching ... Btrfs uses async helper threads to submit write bios so the checksumming helper threads don't block on the disk. The submit bio threads may process bios for more than one block device, so when they find one device congested they try to move on to other devices instead of blocking in get_request_wait for one device. This does a pretty good job of keeping multiple devices busy, but the congested flag has a number of problems. A congested device may still give you a request, and other procs that aren't backing off the congested device may starve you out. This commit uses the io_context stored in current to decide if our process has been made a batching process by the block layer. If so, it keeps sending IO down for at least one batch. This helps make sure we do a good amount of work each time we visit a bdev, and avoids large IO stalls in multi-device workloads. It's also very ugly. A better solution is in the works with Jens Axboe. Signed-off-by: Chris Mason <chris.mason@oracle.com>		2009-04-03 10:27:10 -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-tree.c	Btrfs: try to free metadata pages when we free btree blocks	2009-03-31 14:27:58 -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
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: keep processing bios for a given bdev if our proc is batching	2009-04-03 10:27:10 -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