Re: TASK_UNMAPPED_BASE & stack location

[William Lee Irwin III]

On Fri, 25 Apr 2003, Martin J. Bligh wrote:
>> Is there any good reason we can't remove TASK_UNMAPPED_BASE, and just shove
>> libraries directly above the program text? Red Hat seems to have patches to
>> dynamically tune it on a per-processes basis anyway ...

On Sat, Apr 26, 2003 at 10:37:11AM -0400, Rik van Riel wrote:
> What could be done is leave the stack where it is, but have
> malloc() space and mmap() space grow towards each other:
> 0                                            3G
> | |prog | malloc -->         <-- mmap | stack |
> The stack will get the stack size ulimit size and the space
> between where malloc and mmap start should be about 2.7 GB.
> That 2.7 GB will of course by divided between malloc and mmap,
> but the division will be done dynamically based on whoever
> needs the space.  Much better than the current static 1:1.7
> division...

My internal proposals (backed by code) already include this in addition
to relocating the stack (whose kernel side is trivial).

-- wli