Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...?
From: Rene Herman
Date: Fri Jul 13 2007 - 09:21:40 EST
On 07/13/2007 06:14 AM, Jeremy Fitzhardinge wrote:
Jesper Juhl wrote:
Yes and no. If that will get things moving in the direction of
getting rid of the stack size as a config option, then I'm all for it.
But on the other hand it is my personal opinion that this is an area
where we should just make up our minds as to whether we want 4K or 8K
stacks and whether we want interrupt stacks or not, and then not have
it configurable at all.
Well, smaller stacks are better where possible, but there's nothing
magic about 4k.
Except offcourse it happens to also be the value of PAGE_SIZE at least on x86...
Sure, its mostly enough, but there's no particular reason to believe it
will be enough for everything. You could state a priori that all kernel
code paths must fit into 4k of stack, but that's pretty arbitrary.
As far as I'm aware, the actual reason for 4K stacks is that after the
system has been up and running for some time getting "1 physically
contiguous pages" becomes significantly easier than 2 which wouldn't be
arbitrary.
Rene
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