Messages in this thread | | | Date | Wed, 07 May 2003 09:20:22 -0700 | From | "Martin J. Bligh" <> | Subject | Re: top stack (l)users for 2.5.69 |
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>> Does 2.5 use a separate interrupt stack? (Excuse my ignorance; I >> haven't been paying attention.) Total stack-page usage in the 2.4 >> model, at any rate, is the sum of the task struct, the usage of any >> task-level thread (system calls, pretty much), any softirq (including >> the network protocol & routing handlers, and any netfilter modules), >> and some number of possibly-nested hard interrupts. > > Depends on the architecture. s390 does, ppc didn't as of 2.4.2, the > rest I'm not sure about. But this is another requirement for stack > reduction to 4k for most platforms, if not all.
There are patches to make i386 do this (and use 4K stacks as a config option) from Dave Hansen and Ben LaHaise in 2.5-mjb tree.
>> One thing that would help (aside from separate interrupt stacks) >> would be a guard page below the stack. That wouldn't require any >> physical memory to be reserved, and would provide positive indication >> of stack overflow without significant runtime overhead. > > Yes, that should work. It needs some additional code in the page fault > handler to detect this case, but that shouldn't slow the system down > too much.
There's stack overflow detection in there as well.
M.
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