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Re: [Qemu-discuss] Why does qemu-img produce trace files?

From: Ciro Santilli
Subject: Re: [Qemu-discuss] Why does qemu-img produce trace files?
Date: Tue, 10 Apr 2018 22:46:11 +0100

OK, let me make this a bit more precise just in case: QEMU master
915d34c5f99b0ab91517c69f54272bfdb6ca2b32, built with:

 ./configure --enable-debug --enable-trace-backends=simple

full command:

./qemu-img convert -f raw -O qcow2 rootfs.ext2 img.qcow2

and this then generates a trace file trace-<pid>. Trace options can be
controlled with:

./qemu-img -T ... convert ...

On Tue, Apr 10, 2018 at 10:26 PM, Ciro Santilli <address@hidden> wrote:
> I noticed that qemu-img was producing some trace files when I compiled
> with --enable-trace-backends=simple.
> What is the point of tracing qemu-img?
> I thought trace events were supposed to represent execution related
> things, like "an instruction got executed" and so on.
> I also noticed that qemu-img --trace help and strings trace-* are the
> same, so it must be some kind of index?
> qemu-system-x86_64 also produces those files when I don't give it any traces.
> Can you turn the generation of those traces off when no events are
> given to -trace enable=?

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