lkml.org 
[lkml]   [2002]   [Jun]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch 12/16] fix race between writeback and unlink
Linus Torvalds wrote:
>
> ...
> I'd still love to see a "fast and slightly stupid" allocator for both
> blocks and inodes, and have some infrastructure to do run-time defragging
> in the background.
>

I think runtime defrag could yield really good benefits. In
particular it would allow us to find_group_dir(), and always
put directories in the same blockgroup as their parent (big
speedups for the `untar-a-kernel-tree' workload).

There's a patch at
http://www.zip.com.au/~akpm/linux/patches/2.4/2.4.19-pre10/ext3-reloc-page.patch
which provides a simple `relocate page' ioctl for ext3 files. It
relocates a page's blocks. The operation is fully journalled and
pagecache-coherent. So you can turn off the power in the middle
of a defrag operation and the fs will come back just fine. It doesn't
make any attempt to relocate inodes. If the page relocation attempt fails
then it just returns -EAGAIN and userspace gets to worry about what
to do.

I simply have not had the time to do anything about the userspace
program which drives that ioctl. So if there's anyone out there
who has a little time on their hands...

-
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:22    [W:0.122 / U:1.488 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site