Re: [patch] delayed disk block allocation

[Jeff Garzik <jgarzik@mandrakesoft.com>]

Daniel Phillips wrote:
> On March 1, 2002 09:26 am, Andrew Morton wrote:
> > A bunch of patches which implement allocate-on-flush for 2.5.6-pre1 are
> > available at http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.6-pre1/dalloc-10-core.patch
> >   - Core functions
> > and
> http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.6-pre1/dalloc-20-ext2.patch
> >   - delalloc implementation for ext2.

> Wow, this is massive.  Why did you write [patch] instead of [PATCH]? ;-) I'm
> surprised there aren't any comments on this patch so far, that should teach
> you to post on a Friday afternoon.

My only comment is: how fast can we get delalloc into 2.5.x for further
testing and development?

IMNSHO there are few comments because I believe that few people actually
realize the benefits of delalloc.  My ext2 filesystem with --10--
percent fragmentation could sure use code like this, though.


> >   But it may come unstuck when applied to swapcache.
> 
> You're not even trying to apply this to swap cache right now are you?

This is a disagreement akpm and I have, actually :)

I actually would rather that it was made a requirement that all
swapfiles are "dense", so that new block allocation NEVER must be
performed when swapping.


> There is also my nefarious plan to make
> struct pages refer to variable-binary-sized objects, including smaller than
> 4K PAGE_SIZE.

sigh...

-- 
Jeff Garzik      |
Building 1024    |
MandrakeSoft     | Choose life.