linux-kernel - Re: [PATCH 1/9] perf tools: Add build id shell test

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Date:   Wed, 30 Sep 2020 19:00:05 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/9] perf tools: Add build id shell test

On Wed, Sep 30, 2020 at 10:15 AM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Adding test for build id cache that adds binary
> with sha1 and md5 build ids and verifies it's
> added properly.
>
> The test updates build id cache with perf record
> and perf buildid-cache -a.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

Acked-by: Ian Rogers <irogers@...gle.com>

This is great! If I build perf and test from the build directory the
test gets run. If I build using O=/tmp/perf and run from that
directory then ./tests/shell isn't found and the test doesn't run.
Similarly the install directory doesn't contain the executables and so
the test is skipped. Is there any way to get the test running in these
other scenarios?

Thanks,
Ian

> ---
>  tools/perf/Makefile.perf          | 14 +++++
>  tools/perf/tests/shell/buildid.sh | 90 +++++++++++++++++++++++++++++++
>  2 files changed, 104 insertions(+)
>  create mode 100755 tools/perf/tests/shell/buildid.sh
>
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index 920d8afb9238..b2aeefa64e92 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -126,6 +126,8 @@ include ../scripts/utilities.mak
>  #
>  # Define NO_LIBDEBUGINFOD if you do not want support debuginfod
>  #
> +# Define NO_BUILDID_EX if you do not want buildid-ex-* binaries
> +#
>
>  # As per kernel Makefile, avoid funny character set dependencies
>  unexport LC_ALL
> @@ -349,6 +351,11 @@ ifndef NO_PERF_READ_VDSOX32
>  PROGRAMS += $(OUTPUT)perf-read-vdsox32
>  endif
>
> +ifndef NO_BUILDID_EX
> +PROGRAMS += $(OUTPUT)buildid-ex-sha1
> +PROGRAMS += $(OUTPUT)buildid-ex-md5
> +endif
> +
>  LIBJVMTI = libperf-jvmti.so
>
>  ifndef NO_JVMTI
> @@ -756,6 +763,13 @@ $(OUTPUT)perf-read-vdsox32: perf-read-vdso.c util/find-map.c
>         $(QUIET_CC)$(CC) -mx32 $(filter -static,$(LDFLAGS)) -Wall -Werror -o $@ perf-read-vdso.c
>  endif
>
> +ifndef NO_BUILDID_EX
> +$(OUTPUT)buildid-ex-sha1:
> +       $(QUIET_LINK)echo 'int main(void) { return 0; }' | $(CC) -Wl,--build-id=sha1 -o $@ -x c -
> +$(OUTPUT)buildid-ex-md5:
> +       $(QUIET_LINK)echo 'int main(void) { return 0; }' | $(CC) -Wl,--build-id=md5 -o $@ -x c -
> +endif
> +
>  ifndef NO_JVMTI
>  LIBJVMTI_IN := $(OUTPUT)jvmti/jvmti-in.o
>
> diff --git a/tools/perf/tests/shell/buildid.sh b/tools/perf/tests/shell/buildid.sh
> new file mode 100755
> index 000000000000..57fcd28bc4bd
> --- /dev/null
> +++ b/tools/perf/tests/shell/buildid.sh
> @@ -0,0 +1,90 @@
> +#!/bin/sh
> +# build id cache operations
> +# SPDX-License-Identifier: GPL-2.0
> +
> +# skip if there are no test binaries
> +if [ ! -x buildid-ex-sha1 -a ! -x buildid-ex-md5 ]; then
> +       echo "failed: no test binaries"
> +       exit 2
> +fi
> +
> +# skip if there's no readelf
> +if [ ! -x `which readelf` ]; then
> +       echo "failed: no readelf, install binutils"
> +       exit 2
> +fi
> +
> +check()
> +{
> +       id=`readelf -n $1 2>/dev/null | grep 'Build ID' | awk '{print $3}'`
> +
> +       echo "build id: ${id}"
> +
> +       link=${build_id_dir}/.build-id/${id:0:2}/${id:2}
> +       echo "link: ${link}"
> +
> +       if [ ! -h $link ]; then
> +               echo "failed: link ${link} does not exist"
> +               exit 1
> +       fi
> +
> +       file=${build_id_dir}/.build-id/${id:0:2}/`readlink ${link}`/elf
> +       echo "file: ${file}"
> +
> +       if [ ! -x $file ]; then
> +               echo "failed: file ${file} does not exist"
> +               exit 1
> +       fi
> +
> +       diff ${file} ${1}
> +       if [ $? -ne 0 ]; then
> +               echo "failed: ${file} do not match"
> +               exit 1
> +       fi
> +
> +       echo "OK for ${1}"
> +}
> +
> +test_add()
> +{
> +       build_id_dir=$(mktemp -d /tmp/perf.debug.XXX)
> +       perf="perf --buildid-dir ${build_id_dir}"
> +
> +       ${perf} buildid-cache -v -a ${1}
> +       if [ $? -ne 0 ]; then
> +               echo "failed: add ${1} to build id cache"
> +               exit 1
> +       fi
> +
> +       check ${1}
> +
> +       rm -rf ${build_id_dir}
> +}
> +
> +test_record()
> +{
> +       data=$(mktemp /tmp/perf.data.XXX)
> +       build_id_dir=$(mktemp -d /tmp/perf.debug.XXX)
> +       perf="perf --buildid-dir ${build_id_dir}"
> +
> +       ${perf} record --buildid-all -o ${data} ${1}
> +       if [ $? -ne 0 ]; then
> +               echo "failed: record ${1}"
> +               exit 1
> +       fi
> +
> +       check ${1}
> +
> +       rm -rf ${build_id_dir}
> +       rm -rf ${data}
> +}
> +
> +# add binaries manual via perf buildid-cache -a
> +test_add buildid-ex-sha1
> +test_add buildid-ex-md5
> +
> +# add binaries via perf record post processing
> +test_record buildid-ex-sha1
> +test_record buildid-ex-md5
> +
> +exit ${err}
> --
> 2.26.2
>