Re: Current Instruction Pointer Along Memory Access for A specific Process

["Irfan Ullah (울라 이르판)" <irfan@dke.khu.ac.kr>]

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Thank you. I want to analyze the memory accesses of virtual machines on a
host system and propose efficient prefetchers. Currently, I am trying to
generate the memory accesses and page faults in the order in which they
occur. As said, I can gather page faults directly from "page faults
kvm_mmu_page_fault()
<https://elixir.bootlin.com/linux/latest/source/arch/x86/kvm/mmu/mmu.c#L5429>"
at run time, but I didn't find the location of memory accesses for
virtual machines.
I will check the "perf" that how it could be useful.

On Mon, Jun 8, 2020 at 9:35 PM Greg KH <greg@kroah.com> wrote:

> On Mon, Jun 08, 2020 at 09:28:37PM +0900, Irfan Ullah (울라 이르판) wrote:
> > Hi everyone,
> > I am trying to generate the log of instruction pointers (IPs) along with
> > corresponding memory accesses (including the page faults) in a sequence
> for
> > a specific application. I have generated the log of page faults along
> with
> > corresponding memory addresses by modifying the Linux Kernel code for a
> > specific application, but  I didn't find the location of the
> > current instruction pointers along with corresponding memory addresses;
> > being analyzing Linux kernel code for more than a week. I think what I
> need
> > is available in the code related to the CPU control unit because it
> handles
> > the fetch-execute cycle; I looked for it but couldn't find the code
> > responsible for the fetch-execute cycle in the kernel code.
> >
> > Could anyone suggest to me where could I find the current value of  IP
> > along with the memory address in the Kernel code?
> >
> >  There are some tools available to generate the log of instruction
> pointers
> > with memory accesses but I can't use them because I need a log of memory
> > accesses and page faults in exact sequence and order along with
> > corresponding IPs.
>
> That's an "odd" requirement, what problem are you trying to solve?
>
> Anyway, have you tried the 'perf' tool?  I think it will provide you
> with everything you need here, right?
>
> good luck!
>
> greg k-h
>


-- 
*Best Regards,*


*Mr. Irfan Ullah*
PhD Candidate
Data and Knowledge Engineering(DKE) Lab
Department of Computer Science and Engineering
Kyung Hee University, South Korea.
 +82-010-591-51651 <+82%2010-3877-8867>
  sahibzada.iu@gmail.com
*Skype*: sahibzada_irfanullah

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