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Date: Thu, 3 Jan 2013 09:13:28 -0500
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>
Subject: [PATCH 4/4] resize2fs: use [un]mark_block_range bitmap functions to reduce CPU usage
Use ext2fs_[un]mark_block_range2() functions to reduce the CPU
overhead of resizing large file systems by 45%, primarily by
reducing the time spent in fix_uninit_block_bitmaps().
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
lib/ext2fs/alloc_sb.c | 9 ++++---
resize/resize2fs.c | 67 ++++++++++++++++++---------------------------------
2 files changed, 29 insertions(+), 47 deletions(-)
diff --git a/lib/ext2fs/alloc_sb.c b/lib/ext2fs/alloc_sb.c
index 0d1c000..868d724 100644
--- a/lib/ext2fs/alloc_sb.c
+++ b/lib/ext2fs/alloc_sb.c
@@ -67,10 +67,11 @@ int ext2fs_reserve_super_and_bgd(ext2_filsys fs,
if (old_desc_blk) {
if (fs->super->s_reserved_gdt_blocks && fs->block_map == bmap)
ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
- for (j=0; j < old_desc_blocks; j++)
- if (old_desc_blk + j < ext2fs_blocks_count(fs->super))
- ext2fs_mark_block_bitmap2(bmap,
- old_desc_blk + j);
+ num_blocks = old_desc_blocks;
+ if (old_desc_blk + num_blocks >= ext2fs_blocks_count(fs->super))
+ num_blocks = ext2fs_blocks_count(fs->super) -
+ old_desc_blk;
+ ext2fs_mark_block_bitmap_range2(bmap, old_desc_blk, num_blocks);
}
if (new_desc_blk)
ext2fs_mark_block_bitmap2(bmap, new_desc_blk);
diff --git a/resize/resize2fs.c b/resize/resize2fs.c
index f6a52e5..ac965ee 100644
--- a/resize/resize2fs.c
+++ b/resize/resize2fs.c
@@ -215,9 +215,9 @@ errout:
*/
static void fix_uninit_block_bitmaps(ext2_filsys fs)
{
- blk64_t i, blk, super_blk, old_desc_blk, new_desc_blk;
- int old_desc_blocks;
+ blk64_t blk, lblk;
dgrp_t g;
+ int i;
if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
@@ -228,33 +228,19 @@ static void fix_uninit_block_bitmaps(ext2_filsys fs)
continue;
blk = ext2fs_group_first_block2(fs, g);
-
- ext2fs_super_and_bgd_loc2(fs, g, &super_blk,
- &old_desc_blk, &new_desc_blk, 0);
-
- if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
- old_desc_blocks = fs->super->s_first_meta_bg;
- else
- old_desc_blocks = fs->desc_blocks +
- fs->super->s_reserved_gdt_blocks;
-
- for (i=0; i < fs->super->s_blocks_per_group; i++, blk++) {
- if (blk >= ext2fs_blocks_count(fs->super))
- break;
- if ((blk == super_blk) ||
- (old_desc_blk && old_desc_blocks &&
- (blk >= old_desc_blk) &&
- (blk < old_desc_blk + old_desc_blocks)) ||
- (new_desc_blk && (blk == new_desc_blk)) ||
- (blk == ext2fs_block_bitmap_loc(fs, g)) ||
- (blk == ext2fs_inode_bitmap_loc(fs, g)) ||
- (blk >= ext2fs_inode_table_loc(fs, g) &&
- (blk < ext2fs_inode_table_loc(fs, g)
- + fs->inode_blocks_per_group)))
- ext2fs_fast_mark_block_bitmap2(fs->block_map, blk);
- else
- ext2fs_fast_unmark_block_bitmap2(fs->block_map, blk);
- }
+ lblk = ext2fs_group_last_block2(fs, g);
+ ext2fs_unmark_block_bitmap_range2(fs->block_map, blk,
+ lblk - blk + 1);
+
+ ext2fs_reserve_super_and_bgd(fs, g, fs->block_map);
+ ext2fs_mark_block_bitmap2(fs->block_map,
+ ext2fs_block_bitmap_loc(fs, g));
+ ext2fs_mark_block_bitmap2(fs->block_map,
+ ext2fs_inode_bitmap_loc(fs, g));
+ for (i = 0, blk = ext2fs_inode_table_loc(fs, g);
+ i < (unsigned int) fs->inode_blocks_per_group;
+ i++, blk++)
+ ext2fs_mark_block_bitmap2(fs->block_map, blk);
}
}
@@ -722,8 +708,6 @@ errout:
static errcode_t mark_table_blocks(ext2_filsys fs,
ext2fs_block_bitmap bmap)
{
- blk64_t b;
- unsigned int j;
dgrp_t i;
for (i = 0; i < fs->group_desc_count; i++) {
@@ -732,10 +716,9 @@ static errcode_t mark_table_blocks(ext2_filsys fs,
/*
* Mark the blocks used for the inode table
*/
- for (j = 0, b = ext2fs_inode_table_loc(fs, i);
- j < (unsigned int) fs->inode_blocks_per_group;
- j++, b++)
- ext2fs_mark_block_bitmap2(bmap, b);
+ ext2fs_mark_block_bitmap_range2(bmap,
+ ext2fs_inode_table_loc(fs, i),
+ fs->inode_blocks_per_group);
/*
* Mark block used for the block bitmap
@@ -982,15 +965,13 @@ static errcode_t blocks_to_move(ext2_resize_t rfs)
ext2fs_inode_bitmap_loc(old_fs, i));
if (ext2fs_inode_table_loc(fs, i))
- for (blk = ext2fs_inode_table_loc(fs, i), j=0;
- j < fs->inode_blocks_per_group ; j++, blk++)
- ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
- blk);
+ ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
+ ext2fs_inode_table_loc(fs, i),
+ fs->inode_blocks_per_group);
else if (flex_bg && i < old_fs->group_desc_count)
- for (blk = ext2fs_inode_table_loc(old_fs, i), j=0;
- j < old_fs->inode_blocks_per_group ; j++, blk++)
- ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
- blk);
+ ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
+ ext2fs_inode_table_loc(old_fs, i),
+ old_fs->inode_blocks_per_group);
group_blk += rfs->new_fs->super->s_blocks_per_group;
}
--
1.7.12.rc0.22.gcdd159b
--
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