Re: pte-highmem-5

Hugh Dickins
2002-01-17T12:12:23Z

On Thu, 17 Jan 2002, Christoph Rohland wrote:
> On Wed, 16 Jan 2002, Andrea Arcangeli wrote:
> > They were running out of pagetables, mapping 1G per-task (shm for
> > example) will overflow the lowmem zone with PAE with some houndred
> > tasks in the system. They were pointing the finger at the VM but the
> > VM was just doing the very right thing to do.
>
> This lets me think about putting the swap vector of shmem into highmem
> also. These can get big on highend servers and exactly these servers
> tend to use a lot of shared mem.

Yes, good idea.

But people should realize that moving page tables and other such
structures into not-always-mapped highmem will make them harder to
access with kernel debuggers - I think those will want some changes.

Hugh