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On Thursday 22 December 2005 23:53, linux-os (Dick Johnson) wrote: > > Yesterday I sent a patch to add stack-poison so the stack usage > could be observed.> > Today I wrote a small program and tested the stack usage. Both > the program and the patch is attached. The result is: > > Offset : 2ec8f000 Available Stack bytes = 3104> Offset : 2ecb1000 Available Stack bytes = 3104> Offset : 2ee5f000 Available Stack bytes = 20> Offset : 2f36d000 Available Stack bytes = 3104> Offset : 2fd09000 Available Stack bytes = 3012> Offset : 2fd0b000 Available Stack bytes = 3312> Offset : 2fd0f000 Available Stack bytes = 2132> Offset : 2fd2f000 Available Stack bytes = 2744> Offset : 2fd57000 Available Stack bytes = 2900> Offset : 2fdd5000 Available Stack bytes = 1400> Offset : 2fe35000 Available Stack bytes = 2832> Offset : 2ff3f000 Available Stack bytes = 776> Offset : 2ff45000 Available Stack bytes = 3188> > This, after compiling the kernel. I did not have 4k stacks > enabled for this test so any crashing of the stack beyond > one page will not hurt the system. This was on linux-2.6.13.4. > > Anyway, I tried to enable 4k stacks and the machine would > not boot past trying to install the first module. It just > stopped with the interrupts disabled. So, I am now rebuilding > the kernel back as I write this. That's why I am using 2.6.13 > at the moment.> > Anyway, getting down to 20 bytes of stack-space available > seems to be pretty scary. + movl %esp, %edi + movl %edi, %ecx + andl $~0x1000, %edi + subl %edi, %ecx ecx will be equal to ? + movb $'Q', %al + rep stosb -- vda - 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/ | ||||||||||||
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