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Re: [Qemu-devel] Executed Host Instructions

From: Ayaz Akram
Subject: Re: [Qemu-devel] Executed Host Instructions
Date: Wed, 29 Jun 2016 21:13:47 -0400

Hi all !
I hope you wouldn't mind a quick clarification regarding this question . If
I do not take into account the exceptions and keep on adding number of
translated instructions inside a TB (found through -d out_asm) for each
time TB is seen in the exec trace (found through -d exec and nochaining),
the total number of instructions will overestimate the actual number of
executed host instructions (only for the translated code) ?


On Tue, Jun 28, 2016 at 7:17 AM, Peter Maydell <address@hidden>

> On 28 June 2016 at 11:50, Lluís Vilanova <address@hidden> wrote:
> > Ayaz Akram writes:
> >
> >> Hi All,
> >> I want to count number of host instructions (only for guest code)
> executed
> >> when qemu emulates an application. I wonder if helper functions are
> >> supported with tcg back end as well, which can be a possible solution
> for
> >> the mentioned problem ? If not, is there any other solution in someone's
> >> mind ?
> >
> > If you don't care about helpers, you can use QEMU's log functionality (-d
> > out_asm).
> Note that this doesn't directly count instructions -- it only
> displays the assembly at translate time, and you'd then have
> to calculate the actual executions based on -d exec logging,
> and adjust it to deal with exceptions.
> It ought to be possible to use the icount machinery to trace
> instruction execution counts, but we don't do it today.
> thanks
> -- PMM

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