[RFC, PATCHv2 29/29] mm, x86: introduce RLIMIT_VADDR
From: luto@amacapital.net (Andy Lutomirski)
Date: 2017-01-05 17:56:48
Also in:
linux-api, linux-arch, linux-mm, lkml
On Wed, Jan 4, 2017 at 6:19 AM, Kirill A. Shutemov [off-list ref] wrote:
On Tue, Jan 03, 2017 at 10:27:22AM -0800, Andy Lutomirski wrote:quoted
On Tue, Jan 3, 2017 at 8:04 AM, Kirill A. Shutemov [off-list ref] wrote:quoted
And what about stack? I'm not sure that everybody would be happy with stack in the middle of address space.I would, personally. I think that, for very large address spaces, we should allocate a large block of stack and get rid of the "stack grows down forever" legacy idea. Then we would never need to worry about the stack eventually hitting some other allocation. And 2^57 bytes is hilariously large for a default stack.The stack in the middle of address space can prevent creating other huuuge contiguous mapping. Databases may want this.
Fair enough. OTOH, 2^47 is nowhere near the middle if we were to put it near the top of the legacy address space.