Nick Terrell 26b28dce50 btrfs: Keep one more workspace around ... find_workspace() allocates up to num_online_cpus() + 1 workspaces. free_workspace() will only keep num_online_cpus() workspaces. When (de)compressing we will allocate num_online_cpus() + 1 workspaces, then free one, and repeat. Instead, we can just keep num_online_cpus() + 1 workspaces around, and never have to allocate/free another workspace in the common case. I tested on a Ubuntu 14.04 VM with 2 cores and 4 GiB of RAM. I mounted a BtrFS partition with -o compress-force={lzo,zlib,zstd} and logged whenever a workspace was allocated of freed. Then I copied vmlinux (527 MB) to the partition. Before the patch, during the copy it would allocate and free 5-6 workspaces. After, it only allocated the initial 3. This held true for lzo, zlib, and zstd. The time it took to execute cp vmlinux /mnt/btrfs && sync dropped from 1.70s to 1.44s with lzo compression, and from 2.04s to 1.80s for zstd compression. Signed-off-by: Nick Terrell <terrelln@fb.com> Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>		2017-08-16 16:12:02 +02:00
..
tests	btrfs: remove unused sectorsize member	2017-08-16 14:19:53 +02:00
acl.c	btrfs: Don't clear SGID when inheriting ACLs	2017-06-29 20:24:59 +02:00
async-thread.c	btrfs: constify tracepoint arguments	2017-08-16 14:19:53 +02:00
async-thread.h	btrfs: constify tracepoint arguments	2017-08-16 14:19:53 +02:00
backref.c	btrfs: clean up extraneous computations in add_delayed_refs	2017-08-16 16:12:01 +02:00
backref.h	btrfs: backref, add tracepoints for prelim_ref insertion and merging	2017-08-16 16:12:01 +02:00
btrfs_inode.h	btrfs: constify tracepoint arguments	2017-08-16 14:19:53 +02:00
check-integrity.c	Merge branch 'for-4.13-part1' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux	2017-07-05 16:41:23 -07:00
check-integrity.h	btrfs: take an fs_info directly when the root is not used otherwise	2016-12-06 16:06:59 +01:00
compression.c	btrfs: Keep one more workspace around	2017-08-16 16:12:02 +02:00
compression.h	Merge branch 'for-4.13-part1' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux	2017-07-05 16:41:23 -07:00
ctree.c	btrfs: adjust includes after vmalloc removal	2017-06-19 18:26:02 +02:00
ctree.h	btrfs: Cleanup num_tolerated_disk_barrier_failures	2017-08-16 16:12:02 +02:00
dedupe.h	btrfs: expand cow_file_range() to support in-band dedup and subpage-blocksize	2016-07-26 13:52:25 +02:00
delayed-inode.c	btrfs: convert btrfs_delayed_item.refs from atomic_t to refcount_t	2017-04-18 14:07:23 +02:00
delayed-inode.h	btrfs: convert btrfs_delayed_item.refs from atomic_t to refcount_t	2017-04-18 14:07:23 +02:00
delayed-ref.c	Btrfs: return old and new total ref mods when adding delayed refs	2017-06-29 20:17:01 +02:00
delayed-ref.h	Btrfs: return old and new total ref mods when adding delayed refs	2017-06-29 20:17:01 +02:00
dev-replace.c	btrfs: fix integer overflow in calc_reclaim_items_nr	2017-06-29 20:17:02 +02:00
dev-replace.h	btrfs: constify device path passed to relevant helpers	2017-02-28 14:26:07 +01:00
dir-item.c	btrfs: fix validation of XATTR_ITEM dir items	2017-06-29 20:06:11 +02:00
disk-io.c	btrfs: Cleanup num_tolerated_disk_barrier_failures	2017-08-16 16:12:02 +02:00
disk-io.h	btrfs: Cleanup num_tolerated_disk_barrier_failures	2017-08-16 16:12:02 +02:00
export.c	btrfs: Check name_len before reading btrfs_get_name	2017-06-21 19:16:04 +02:00
export.h
extent_io.c	btrfs: btrfs_check_shared should manage its own transaction	2017-08-16 14:19:53 +02:00
extent_io.h	btrfs: struct-funcs, constify readers	2017-08-16 14:19:53 +02:00
extent_map.c	btrfs: convert extent_map.refs from atomic_t to refcount_t	2017-04-18 14:07:23 +02:00
extent_map.h	btrfs: convert extent_map.refs from atomic_t to refcount_t	2017-04-18 14:07:23 +02:00
extent-tree.c	btrfs: drop newlines from strings when using btrfs_* helpers	2017-08-16 16:12:02 +02:00
file-item.c	Merge branch 'for-4.13-part1' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux	2017-07-05 16:41:23 -07:00
file.c	Merge branch 'nowait-aio-btrfs-fixup' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux	2017-07-10 10:27:48 -07:00
free-space-cache.c	btrfs: drop newlines from strings when using btrfs_* helpers	2017-08-16 16:12:02 +02:00
free-space-cache.h	btrfs: free-space-cache, clean up unnecessary root arguments	2017-02-17 12:03:56 +01:00
free-space-tree.c	Btrfs: use memalloc_nofs and kvzalloc() for free space tree bitmaps	2017-06-19 18:26:01 +02:00
free-space-tree.h	Btrfs: implement the free space B-tree	2015-12-17 12:16:47 -08:00
hash.c	crypto: Work around deallocated stack frame reference gcc bug on sparc.	2017-06-08 17:36:03 +08:00
hash.h	btrfs: advertise which crc32c implementation is being used at module load	2016-06-06 14:08:28 +02:00
inode-item.c	btrfs: take an fs_info directly when the root is not used otherwise	2016-12-06 16:06:59 +01:00
inode-map.c	btrfs: qgroup: Introduce extent changeset for qgroup reserve functions	2017-06-29 20:17:02 +02:00
inode-map.h	Btrfs: Initialize btrfs_root->highest_objectid when loading tree root and subvolume roots	2016-01-15 19:25:02 +01:00
inode.c	btrfs: drop newlines from strings when using btrfs_* helpers	2017-08-16 16:12:02 +02:00
ioctl.c	btrfs: fix integer overflow in calc_reclaim_items_nr	2017-06-29 20:17:02 +02:00
Kconfig	rcu: Make SRCU optional by using CONFIG_SRCU	2015-01-06 11:04:29 -08:00
locking.c	btrfs: cleanup, remove stray return statements	2016-01-07 14:30:52 +01:00
locking.h	btrfs: fix lockups from btrfs_clear_path_blocking	2014-11-19 10:34:35 -08:00
lzo.c	btrfs: switch to kvmalloc and GFP_KERNEL in lzo/zlib alloc_workspace	2017-06-19 18:26:02 +02:00
Makefile	Btrfs: add free space tree sanity tests	2015-12-17 12:16:47 -08:00
math.h	btrfs: cleanup 64bit/32bit divs, compile time constants	2015-03-03 17:23:57 +01:00
ordered-data.c	btrfs: fix integer overflow in calc_reclaim_items_nr	2017-06-29 20:17:02 +02:00
ordered-data.h	btrfs: fix integer overflow in calc_reclaim_items_nr	2017-06-29 20:17:02 +02:00
orphan.c	btrfs: kill the key type accessor helpers	2014-09-17 13:37:12 -07:00
print-tree.c	Btrfs: let btrfs_print_leaf print more about block group	2017-06-19 18:26:00 +02:00
print-tree.h	btrfs: take an fs_info directly when the root is not used otherwise	2016-12-06 16:06:59 +01:00
props.c	btrfs: Verify dir_item in iterate_object_props	2017-06-21 19:16:04 +02:00
props.h
qgroup.c	btrfs: drop newlines from strings when using btrfs_* helpers	2017-08-16 16:12:02 +02:00
qgroup.h	btrfs: qgroup: Fix qgroup reserved space underflow by only freeing reserved ranges	2017-06-29 20:17:02 +02:00
raid56.c	Merge branch 'for-4.13-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux	2017-07-14 22:55:52 -07:00
raid56.h	btrfs: take an fs_info directly when the root is not used otherwise	2016-12-06 16:06:59 +01:00
rcu-string.h
reada.c	btrfs: remove unused member err from reada_extent	2017-06-19 18:25:59 +02:00
relocation.c	btrfs: fix integer overflow in calc_reclaim_items_nr	2017-06-29 20:17:02 +02:00
root-tree.c	btrfs: Check name_len before in btrfs_del_root_ref	2017-06-21 19:16:04 +02:00
scrub.c	btrfs: drop newlines from strings when using btrfs_* helpers	2017-08-16 16:12:02 +02:00
send.c	Btrfs: incremental send, fix invalid memory access	2017-07-06 23:02:30 +01:00
send.h	Btrfs: use linux/sizes.h to represent constants	2016-01-07 14:38:02 +01:00
struct-funcs.c	btrfs: struct-funcs, constify readers	2017-08-16 14:19:53 +02:00
super.c	btrfs: Do chunk level check for degraded remount	2017-08-16 16:12:02 +02:00
sysfs.c	btrfs: Add quota_override knob into sysfs	2017-06-19 18:25:58 +02:00
sysfs.h	btrfs: sysfs: introduce helper for syncing bits with sysfs files	2016-01-21 18:50:40 +01:00
transaction.c	btrfs: fix integer overflow in calc_reclaim_items_nr	2017-06-29 20:17:02 +02:00
transaction.h	btrfs: remove unused qgroup members from btrfs_trans_handle	2017-04-18 14:07:25 +02:00
tree-defrag.c	Btrfs: fix locking bugs when defragging leaves	2015-12-18 02:51:32 +00:00
tree-log.c	Btrfs: fix dir item validation when replaying xattr deletes	2017-07-19 20:38:16 +02:00
tree-log.h	btrfs: Make btrfs_del_inode_ref take btrfs_inode	2017-02-14 15:50:54 +01:00
ulist.c	btrfs: ulist: rename ulist_fini to ulist_release	2017-02-17 12:03:50 +01:00
ulist.h	btrfs: ulist: rename ulist_fini to ulist_release	2017-02-17 12:03:50 +01:00
uuid-tree.c	btrfs: return the actual error value from from btrfs_uuid_tree_iterate	2016-12-19 18:08:15 +01:00
volumes.c	btrfs: Enhance message when a device is missing during mount	2017-08-16 16:12:02 +02:00
volumes.h	btrfs: Enhance message when a device is missing during mount	2017-08-16 16:12:02 +02:00
xattr.c	btrfs: Check name_len with boundary in verify dir_item	2017-06-21 19:16:04 +02:00
xattr.h	btrfs: Switch to generic xattr handlers	2016-05-17 19:17:09 -04:00
zlib.c	btrfs: switch to kvmalloc and GFP_KERNEL in lzo/zlib alloc_workspace	2017-06-19 18:26:02 +02:00