On Mon, Jul 20, 2009 at 06:17:50PM -0600, Andreas Dilger wrote:
> Attached is the e2freefrag tool. It grabs the block bitmaps, creates
> buddy bitmaps from them and displays the total/free chunks (default
> 1MB chunk size), and a histogram of free space.
>
> It could probably be enhanced to print the chunk sizes based on the
> RAID chunk size stored in the superblock, but I just thought of that
> this minute...
Thanks, checked in with some minor changes to fix some printf
warnings.
Here's the output on my root filesystem (which has been in use since
February):
Device: /dev/ssd/root
Blocksize: 4096 bytes
Total blocks: 18350080
Free blocks: 10774142 (58.7%)
Chunksize: 1048576 bytes (256 blocks)
Total chunks: 71681
Free chunks: 21792 (30.4%)
Min free chunk: 4 KB
Max free chunk: 568232 KB
Avg free chunk: 184 KB
HISTOGRAM OF FREE CHUNK SIZES:
Chunk Size Range : Free chunks
4K... 8K- : 35005
8K... 16K- : 33639
16K... 32K- : 31419
32K... 64K- : 33953
64K... 128K- : 26397
128K... 256K- : 7314
256K... 512K- : 1855
512K... 1024K- : 1612
1M... 2M- : 1160
2M... 4M- : 567
4M... 8M- : 303
8M... 16M- : 106
16M... 32M- : 40
32M... 64M- : 51
64M... 128M- : 123
128M... 256M- : 8
512M... 1024M- : 1
Yeah.... pretty fragmented. :-(
- Ted
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