Messages in this thread | | | Subject | Re: x86: 4kstacks default | From | Benjamin Herrenschmidt <> | Date | Wed, 23 Apr 2008 15:27:01 +1000 |
| |
On Sat, 2008-04-19 at 16:23 +0200, Ingo Molnar wrote: > * Andrew Morton <akpm@linux-foundation.org> wrote: > > > > config 4KSTACKS > > > bool "Use 4Kb for kernel stacks instead of 8Kb" > > > - depends on DEBUG_KERNEL > > > depends on X86_32 > > > + default y > > > > This patch will cause kernels to crash. > > what mainline kernels crash and how will they crash? Fedora and other > distros have had 4K stacks enabled for years: > > $ grep 4K /boot/config-2.6.24-9.fc9 > CONFIG_4KSTACKS=y > > and we've conducted tens of thousands of bootup tests with all sorts of > drivers and kernel options enabled and have yet to see a single crash > due to 4K stacks. So basically the kernel default just follows the > common distro default now. (distros and users can still disable it)
Do we routinely test nasty scenarii such as a GFP_KERNEL allocation deep in a call stack trying to swap something out to NFS ?
Ben.
| |