Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core)

Dave Hansen
2006-08-17T14:36:29Z

On Thu, 2006-08-17 at 17:31 +0400, Kirill Korotaev wrote:
> > How many things actually use this? Can we have the slab ubcs
> without
> > the struct page pointer?
> slab doesn't use this pointer on the page.
> It is used for pages allocated by buddy
> alocator implicitly (e.g. LDT pages, page tables, ...).

Hmmm. There aren't _that_ many of those cases, right? Are there any
that absolutely need raw access to the buddy allocator? I'm pretty sure
that pagetables can be moved over to a slab, as long as we bump up the
alignment.

It does seem a wee bit silly to have the pointer in _all_ of the struct
pages, even the ones for which we will never do any accounting (and even
on kernels that never need it). But, a hashing scheme sounds like a
fine idea.

-- Dave