linux-kernel - Re: [PATCH v1 00/14] perf kvm: Support histograms and TUI mode

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Date:   Tue, 28 Feb 2023 16:51:49 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 00/14] perf kvm: Support histograms and TUI mode

Hi Arnaldo,

On Mon, Feb 27, 2023 at 06:40:13PM -0300, Arnaldo Carvalho de Melo wrote:

[...]

> > And I verified the '--stdio' mode and confirmed it has the same result
> > with before applying this series.
> 
> Can you provide precise instructions for all the steps involved? from
> 'perf kvm record', I'm trying here with a simple 'perf kvm record' and
> then starting vm and having trouble.

Below are steps for verification this patch set.

In a terminal, I launch a KVM virtual machine with qemu command; I
downloaded an Ubuntu iso file [1] ahead and used it as the file system
image (or you could use any distro's iso file as file system image):

  $ qemu-system-x86_64 -M pc -enable-kvm -cpu host -m 4096 -hda ubuntu-22.04-desktop-amd64.iso

Then in another terminal, I can use below commands to capture KVM trace
data and report the result:

  # cd linux/tools/perf
  # ./perf kvm stat record
  # ./perf kvm stat report          => Output in TUI mode
  # ./perf kvm stat report --stdio  => Output in stdio mode

Note, I have sent out the patch set v2 to fix a potential building
failure in patch 13.  Please work on the new patch set [2].

Thanks,
Leo

[1] https://releases.ubuntu.com/22.04/ubuntu-22.04.2-desktop-amd64.iso
[2] https://lore.kernel.org/lkml/20230228084147.106167-1-leo.yan@linaro.org/