Re: TASK_UNMAPPED_BASE & stack location

[Hugh Dickins]

On Fri, 25 Apr 2003, Martin J. Bligh wrote:
> >> 128Mb of it? The bottom page, or even a few Mb, sure ... 
> >> but 128Mb seems somewhat excessive ..

Yes.

> > Considering that your process space is 4gig, and that that 128Mb doesn't
> > really exist anywhere (no RAM, no page table entries, nothing), it's
> > really not excessive.  
> 
> I need the virtual space.

Plus you would (very often) get more physical.  i386 ELF text typically
begins at 0x08048000: putting stack just below text in many cases shares
page table between stack+text+data, and saves the page table at top of
user address space.

Hugh