Re: [Qemu-devel] Detecting context switch in QEMU

[Xin Tong]

On Sat, Sep 1, 2012 at 10:52 PM, Mulyadi Santosa
<address@hidden> wrote:
> On Sun, Sep 2, 2012 at 2:33 AM, Xin Tong <address@hidden> wrote:
>> I want to detect context switches in QEMU x86_64-softmmu. one of the
>> ideas i have is to track the write to CR3. is this valid on QEMU  (
>> i.e. are their any cases in which the assumption could break).
>
>
> CMIIW, if context switch happen from a parent process to its NPTL
> based thread, or to kernel thread, then CR3 won't be updated since
> they are using the same address space in Linux kernel, right?
>
> And that includes no TLB flush AFAIK.....
>
Ok, i do not know this. but it seems tracking CR3 is no good. any ideas ?

Xin

>
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
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