Re: [patch] flexible-mmap-2.6.7-D5

[William Lee Irwin III]

On Fri, Jun 18, 2004 at 11:38:14PM +0200, Ingo Molnar wrote:
> the flexible-mmap-2.6.7-D5 patch (attached) splits the flexible-mmap
> layout stuff out of exec-shield. The patch is against 2.6.7 + my latest
> NX patch. (i've attached the NX patch too, for convenience.)
> the goal of the patch is to change the way virtual memory is allocated,
> from:
>   0x08000000 ... binary image
>   0x08xxxxxx ... brk area, grows upwards
>   0x40000000 ... start of mmap, new mmaps go after old ones
>   0xbfxxxxxx ... stack
> to a more flexible top-down mmap() method:
> 
>   0x08000000 ... binary image
>   0x08xxxxxx ... brk area, grows upwards
>   0xbfxxxxxx ... _end_ of all mmaps, new mmaps go below old ones
>   0xbfyyyyyy ... stack

It may be useful to move STACK_TOP to 0x8040000 give the stack more head
room and fit small statically-linked executables into one pagetable page.
Otherwise the stack has very little headroom after the first mmap().


-- wli
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