Re: [RFC] 4KB stack + irq stack for x86
Stephen Lord (firstname.lastname@example.org)
05 Jun 2002 21:30:05 -0500
On Wed, 2002-06-05 at 20:42, Benjamin LaHaise wrote:
> On Thu, Jun 06, 2002 at 03:15:17AM +0200, Andi Kleen wrote:
> > The scenario Steve outlined was rather optimistic - more pessimistic
> > case would be e.g:
> > you run NBD which calls the network stack with an complex file system on top
> > of it called by something else complex that does a GFP_KERNEL alloc and VM
> > wants to flush a page via the NBD file system - I don't see how you'll ever
> > manage to fit that into 4K.
> Which is, honestly, a bug. The IO subsystem should not be capable of
> engaging in such deep recursion. ext2/ext3 barely allocate anything
> on the stack (0x90 bytes at most in only a couple of calls), the vm
> is in a similar state, and even the network stack's largest allocations
> are in syscalls and timer code. Face it, the majority of code that is
> or could cause problems are things that probably need fixing anyways.
Well, reclaiming memory within the same thread which is allocating
memory is surely the root cause of this, not the I/O system.
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