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Message-ID: <CAP-5=fW+ybe3GStU2ttUKH4BSwiyhS=zf6uHUORVEXhexFJxtQ@mail.gmail.com>
Date: Thu, 24 Aug 2023 22:28:39 -0700
From: Ian Rogers <irogers@...gle.com>
To: Yang Jihong <yangjihong1@...wei.com>
Cc: peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
mark.rutland@....com, alexander.shishkin@...ux.intel.com,
jolsa@...nel.org, namhyung@...nel.org, adrian.hunter@...el.com,
kan.liang@...ux.intel.com, james.clark@....com,
tmricht@...ux.ibm.com, ak@...ux.intel.com,
anshuman.khandual@....com, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v6 6/7] perf test: Add test case for record sideband events
On Sun, Aug 20, 2023 at 6:30 PM Yang Jihong <yangjihong1@...wei.com> wrote:
>
> Add a new test case to record sideband events for all CPUs when tracing
> selected CPUs
>
> Test result:
>
> # ./perf test list 2>&1 | grep 'perf record sideband tests'
> 95: perf record sideband tests
> # ./perf test 95
> 95: perf record sideband tests : Ok
>
> Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
> Tested-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
> tools/perf/tests/shell/record_sideband.sh | 44 +++++++++++++++++++++++
> 1 file changed, 44 insertions(+)
> create mode 100755 tools/perf/tests/shell/record_sideband.sh
>
> diff --git a/tools/perf/tests/shell/record_sideband.sh b/tools/perf/tests/shell/record_sideband.sh
> new file mode 100755
> index 000000000000..2ecf00011cb1
> --- /dev/null
> +++ b/tools/perf/tests/shell/record_sideband.sh
> @@ -0,0 +1,44 @@
> +#!/bin/sh
> +# perf record sideband tests
> +# SPDX-License-Identifier: GPL-2.0
> +
> +set -e
> +
> +err=0
> +perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
Could you add some kind of cleanup on trap function like:
https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/tests/shell/record.sh?h=perf-tools-next#n26
It'd be okay to do this as a follow up patch.
Thanks,
Ian
> +
> +can_cpu_wide()
> +{
> + if ! perf record -o ${perfdata} -BN --no-bpf-event -C $1 true 2>&1 >/dev/null
> + then
> + echo "record sideband test [Skipped cannot record cpu$1]"
> + err=2
> + fi
> +
> + rm -f ${perfdata}
> + return $err
> +}
> +
> +test_system_wide_tracking()
> +{
> + # Need CPU 0 and CPU 1
> + can_cpu_wide 0 || return 0
> + can_cpu_wide 1 || return 0
> +
> + # Record on CPU 0 a task running on CPU 1
> + perf record -BN --no-bpf-event -o ${perfdata} -C 0 -- taskset --cpu-list 1 true
> +
> + # Should get MMAP events from CPU 1
> + mmap_cnt=`perf script -i ${perfdata} --show-mmap-events -C 1 2>/dev/null | grep MMAP | wc -l`
> +
> + rm -f ${perfdata}
> +
> + if [ ${mmap_cnt} -gt 0 ] ; then
> + return 0
> + fi
> +
> + echo "Failed to record MMAP events on CPU 1 when tracing CPU 0"
> + return 1
> +}
> +
> +test_system_wide_tracking
> --
> 2.30.GIT
>
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