linux-ext4 - [PATCH 0/5] mke2fs/e2fsck optimizations

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Message-Id: <1363709164-3210-1-git-send-email-qrxd43@motorola.com>
Date:	Tue, 19 Mar 2013 20:05:59 +0400
From:	Andrey Sidorov <qrxd43@...orola.com>
To:	linux-ext4@...r.kernel.org
Subject: [PATCH 0/5] mke2fs/e2fsck optimizations

Various optimizations for mke2fs / e2fsck.
First patch makes no big change for x86, but saves a
couple of seconds on embedded systems. Mostly effective
for large non-bigalloc volumes.
The rest of the series is to improve mke2fs time on
bigalloc volumes.

Times for mke2fs of 1TB volume
x86, plain: 7.5s -> 7.0s
x86, bigalloc256: 6.5s -> 1.9s
mips, plain: 9.9s -> 5.7s
mips, bigalloc256: 29.0s -> 1.9s

Testing done:
patched mke2fs, unpatched e2fsck, patched e2fsck,
mount, basic write operations, unmount,
unpatched e2fsck, patched e2fsck.
ffs/ffz were tested with tst_bitmaps commands which
cover all exit paths for rb_tree implementation.
Output of tst_bitmaps is same for ba and rb bitmaps.

Andrey Sidorov (5):
  libext2fs: Optimize ext2fs_allocate_group_table()
  libext2fs: find_first_set() for bitmaps.
  libext2fs: find_first_set() for bitarray bitmap
  libext2fs: ffz/ffs for rb_tree bitmap
  libext2fs: Optimize ext2fs_convert_subcluster_bitmap()

 lib/ext2fs/alloc_tables.c     |   31 +++++---
 lib/ext2fs/bitops.h           |   41 +++++++++++
 lib/ext2fs/blkmap64_ba.c      |   83 +++++++++++++++++++--
 lib/ext2fs/blkmap64_rb.c      |  164 +++++++++++++++++++++++++++++++++++++++--
 lib/ext2fs/bmap64.h           |    4 +-
 lib/ext2fs/ext2fs.h           |    3 +
 lib/ext2fs/gen_bitmap.c       |   23 ++++++
 lib/ext2fs/gen_bitmap64.c     |  118 +++++++++++++++++++++++------
 lib/ext2fs/tst_bitmaps.c      |   66 +++++++++++++++++
 lib/ext2fs/tst_bitmaps_cmd.ct |    6 ++
 10 files changed, 492 insertions(+), 47 deletions(-)

-- 
1.7.10.4

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