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Re: [Qemu-devel] a quesion
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From: |
Richard Henderson |
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Subject: |
Re: [Qemu-devel] a quesion |
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Date: |
Wed, 17 Aug 2016 08:43:05 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 |
On 08/17/2016 12:57 AM, Michael Rolnik wrote:
another question.
is it possible to measure number of executed instruction between two calls to
device read/write functions?
Not really.
I know there is qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) function, but it requires
to assume that icount is used and CPU frequence.
Indeed, which is why it's generally good enough to invent a plausible cpu
frequency and use the (virtual) wall clock for the cycle counter.
See, for instance, target-alpha/sys_helper.c, helper_load_pcc.
r~