double fault

[Mathieu Desnoyers]

* Martin Hunt (hunt@redhat.com) wrote:
> > Did you try : 
> > 
> > - allocating the memory with kmalloc instead of vmalloc ?
> 
> Why would I do that?  What would I look for?  vmalloc already works.
> 

Memory allocated by vmalloc will generate a minor page fault when accessed from
kernel space on behalf of a different process. The page fault handler will
simply update the process'page table in that case. If the page fault handler is
instrumented for a minor fault and the logging code generates a page fault, it
clearly causes a double fault.

But as you only instrument sys_open, this case does not apply.

Mathieu

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