Re: TASK_SIZE is variable.

Paul Mackerras
2005-01-30T12:10:02Z

Andi Kleen writes:

> I plan to fix this anyways in a more generic way - 4 level currently
> has some bad performance regression because it scans much more pagetables.
> DaveM had an old patch to use bitmaps for used entries in struct page.
> For your 32bit processes only the first bit would be set and it would not
> look at most of the pgds. The plan was to redo Dave's old patch
> for 4 level (I wanted to redo it a bit because I didn't like how
> his iterators worked)

Sounds good. I'm looking forward to the patch.

In the meantime I think that MM_VM_SIZE(mm) should be renamed to
MAX_TASK_SIZE without the mm argument. MAX_TASK_SIZE can default to
TASK_SIZE and be overridden on architectures that have more than one
task size.

Paul.