Re: [Linux-ia64] Re: [PATCH] Increase size of user stack

From: Martin Hicks <>
Date: 2003-05-13 00:59:38
On Mon, May 12, 2003 at 03:44:17PM +0100, Matthew Wilcox wrote:
> On Mon, May 12, 2003 at 10:38:44AM -0400, Martin Hicks wrote:
> > > 
> > (sorry for taking so long to respond about this)
> > 
> > The user stack size is configurable through setrlimit().  The default 
> > size of the user stack is 8MB and the max is ~0UL.  The problem is
> > the addreses that are chosen for the stack (which grows down) and the
> > register backing store (which grows up) are only 2GB apart.  My patch
> > simply makes this space 512GB so that large stack are possible, without
> > the stack smashing into the RBS.
> Yes, but why not choose the addresses based on the current setting of
> current->rlim[RLIMIT_STACK].rlim_max?  We could default that setting to
> 2GB (ie the same as what people are using now) and then set the RBS and
> the user stack min(1TB, current->rlim[RLIMIT_STACK].rlim_max) apart.
> Are there any disadvantages to doing this?

Maybe I'm missing something, but what happens if a process is created
using the default 2GB between the RBS and the stack and sometime
later the process does a setrlimit to 100GB of stack.  How do the 
stack and RBS get moved around to make enough room between the two
start addresses?


Wild Open Source Inc.        
Received on Mon May 12 07:59:42 2003

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