Skip to main content

Browse the archive

Revision ce93ec548cfa02f9cd6b70d546d5f36f4d160f57 authored by Josef Bacik on 17 November 2014, 20:45:48 UTC, committed by Chris Mason on 22 January 2015, 01:36:52 UTC 
Btrfs: track dirty block groups on their own list
 
Currently any time we try to update the block groups on disk we will walk _all_
block groups and check for the ->dirty flag to see if it is set.  This function
can get called several times during a commit.  So if you have several terabytes
of data you will be a very sad panda as we will loop through _all_ of the block
groups several times, which makes the commit take a while which slows down the
rest of the file system operations.

This patch introduces a dirty list for the block groups that we get added to
when we dirty the block group for the first time.  Then we simply update any
block groups that have been dirtied since the last time we called
btrfs_write_dirty_block_groups.  This allows us to clean up how we write the
free space cache out so it is much cleaner.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
1 parent e7070be
Raw File
Makefile 
###
# scripts contains sources for various helper programs used throughout
# the kernel for the build process.
# ---------------------------------------------------------------------------
# kallsyms:      Find all symbols in vmlinux
# pnmttologo:    Convert pnm files to logo files
# conmakehash:   Create chartable
# conmakehash:	 Create arrays for initializing the kernel console tables
# docproc:       Used in Documentation/DocBook

HOST_EXTRACFLAGS += -I$(srctree)/tools/include

hostprogs-$(CONFIG_KALLSYMS)     += kallsyms
hostprogs-$(CONFIG_LOGO)         += pnmtologo
hostprogs-$(CONFIG_VT)           += conmakehash
hostprogs-$(BUILD_C_RECORDMCOUNT) += recordmcount
hostprogs-$(CONFIG_BUILDTIME_EXTABLE_SORT) += sortextable
hostprogs-$(CONFIG_ASN1)	 += asn1_compiler

HOSTCFLAGS_sortextable.o = -I$(srctree)/tools/include
HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include

always		:= $(hostprogs-y) $(hostprogs-m)

# The following hostprogs-y programs are only build on demand
hostprogs-y += unifdef docproc

# These targets are used internally to avoid "is up to date" messages
PHONY += build_unifdef build_docproc
build_unifdef: $(obj)/unifdef
	@:
build_docproc: $(obj)/docproc
	@:

subdir-$(CONFIG_MODVERSIONS) += genksyms
subdir-y                     += mod
subdir-$(CONFIG_SECURITY_SELINUX) += selinux
subdir-$(CONFIG_DTC)         += dtc

# Let clean descend into subdirs
subdir-	+= basic kconfig package
back to top