Re: RFC/POC Make Page Tables Relocatable

[Dave Hansen <haveblue@us.ibm.com>]

On Thu, 2007-10-25 at 15:58 -0400, Ross Biro wrote:
> On 10/25/07, Ross Biro <rossb@google.com> wrote:
> > On 10/25/07, Dave Hansen <haveblue@us.ibm.com> wrote:
> > > With the pagetable page you can go examine ptes.  From the ptes, you can
> > > get the 'struct page' for the mapped page.  From there, you can get the
> >
> > Definitely worth considering.
> 
> Now I remember.  At least in the slab allocator, the relocation code
> must hold an important spinlock while the relocation occurs.  Maybe I
> can get around that, but maybe not.  If not, that could be a
> fundamental problem, but at least it prevents doing long searches.

"important spinlock" isn't really precise enough for me to understand
what you are talking about, make any arguments for or against it, or
suggest alternatives. :(

If the slab is truly a constraint, perhaps you should consider alternate
mechanisms, or fix the slab instead.

-- Dave

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