]> nv-tegra.nvidia Code Review - linux-2.6.git/commit
ext4: Adjust ext4_da_writepages() to write out larger contiguous chunks
authorTheodore Ts'o <tytso@mit.edu>
Tue, 29 Sep 2009 17:31:31 +0000 (13:31 -0400)
committerTheodore Ts'o <tytso@mit.edu>
Tue, 29 Sep 2009 17:31:31 +0000 (13:31 -0400)
commit55138e0bc29c0751e2152df9ad35deea542f29b3
tree40dbc77de3e7a426030bd740ba8e2fd0d2171523
parent71780577306fd1e76c7a92e3b308db624d03adb9
ext4: Adjust ext4_da_writepages() to write out larger contiguous chunks

Work around problems in the writeback code to force out writebacks in
larger chunks than just 4mb, which is just too small.  This also works
around limitations in the ext4 block allocator, which can't allocate
more than 2048 blocks at a time.  So we need to defeat the round-robin
characteristics of the writeback code and try to write out as many
blocks in one inode before allowing the writeback code to move on to
another inode.  We add a a new per-filesystem tunable,
max_writeback_mb_bump, which caps this to a default of 128mb per
inode.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
fs/ext4/ext4.h
fs/ext4/inode.c
fs/ext4/super.c
include/trace/events/ext4.h