lkml.org 
[lkml]   [2003]   [May]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: top stack (l)users for 2.5.69
>> 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.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:35    [W:0.106 / U:0.944 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site