Messages in this thread | | | Subject | Re: [RFC] 4KB stack + irq stack for x86 | From | Stephen Lord <> | Date | 05 Jun 2002 21:30:05 -0500 |
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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.
Steve
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