Re: [PATCH] no buddy bitmap patch : intro and includes [0/2]

[Dave Hansen]

On Thu, 2004-10-07 at 08:03, Tolentino, Matthew E wrote:
> >> Followings are patches for removing bitmaps from buddy=20
> >allocator, against 2.6.9-rc3.
> >> I think this version is much clearer than ones I posted a month ago.
> >...
> >> If there is unclear point, please tell me.
> >
> >What was the purpose behind this, again? Sorry, has been too long since
> >I last looked.
> 
> For one, it avoids the otherwise requisite resizing of the bitmaps=20
> during memory hotplug operations...

It also simplifies the nonlinear implementation.  The whole reason we
had the lpfn (Linear) stuff was so that the bitmaps could represent a
sparse physical address space in a much more linear fashion.  With no
bitmaps, this isn't an issue, and gets rid of a lot of code, and a
*huge* source of bugs where lpfns and pfns are confused for each other. 
-- Dave

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