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Date: Tue, 15 Aug 2023 14:30:18 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
LKML <linux-kernel@...r.kernel.org>,
linux-perf-users@...r.kernel.org,
Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Subject: Re: [PATCH 2/2] perf test: Add perf record sample filtering test
Em Thu, Aug 10, 2023 at 07:58:22PM -0700, Namhyung Kim escreveu:
> $ sudo ./perf test 'sample filter' -v
> 94: perf record sample filtering (by BPF) tests :
> --- start ---
> test child forked, pid 3817527
> Checking BPF-filter privilege
> Basic bpf-filter test
> Basic bpf-filter test [Success]
> Failing bpf-filter test
> Error: task-clock event does not have PERF_SAMPLE_CPU
> Failing bpf-filter test [Success]
> Group bpf-filter test
> Error: task-clock event does not have PERF_SAMPLE_CPU
> Error: task-clock event does not have PERF_SAMPLE_CODE_PAGE_SIZE
> Group bpf-filter test [Success]
> test child finished with 0
> ---- end ----
> perf record sample filtering (by BPF) tests: Ok
[root@...e ~]# perf test -v "by BPF"
91: perf record sample filtering (by BPF) tests :
--- start ---
test child forked, pid 64165
Checking BPF-filter privilege
Basic bpf-filter test
ffffffff97f4f688
ffffffff97f73859
ffffffff97412ce6
ffffffff976da215
ffffffff973a92bf
ffffffff97376ad7
ffffffff97f73859
ffffffff97f7400c
ffffffff97365116
ffffffff97f73859
ffffffff97f5320c
ffffffff973ea351
ffffffff97143774
ffffffff9740f730
ffffffff9736944f
ffffffff973e593d
ffffffff976e36c8
ffffffffc12cf19b
ffffffff976c79d5
ffffffff9737d254
ffffffff9737d254
ffffffff9737d254
ffffffff9737d254
ffffffff9737d254
ffffffff9737ca5f
ffffffff9737d254
ffffffff9737d254
ffffffff9737d339
ffffffff9737dcf3
ffffffff9737dcf3
ffffffff9737d254
ffffffff973e442a
ffffffff973713b8
ffffffff973ea561
ffffffff973712ee
ffffffff973713b8
ffffffff973713b8
ffffffff973e43fa
ffffffff971fa17e
ffffffff971fa17e
ffffffff973ac8ee
ffffffff97f73859
ffffffff9741082c
ffffffff973ea34a
ffffffff974148c6
ffffffff974c97d5
ffffffff97394b51
ffffffff973916af
ffffffff9737b5e3
ffffffff976cf825
ffffffff9737c58d
ffffffff9788ab15
ffffffff9732af89
ffffffff97096ef3
ffffffff973e92fd
ffffffff9730a991
ffffffff9739e2c5
ffffffff9731cdc2
ffffffff97f363c4
ffffffff97f3915c
ffffffff97f5d754
ffffffff9718a181
ffffffff9709b1a5
ffffffff973710e4
ffffffff97f52b27
ffffffff9738b905
ffffffff971fdca5
ffffffff9737dbc4
ffffffff971b4e04
Basic bpf-filter test [Failed invalid output]
test child finished with -1
---- end ----
perf record sample filtering (by BPF) tests: FAILED!
[root@...e ~]#
[root@...e ~]# uname -a
Linux five 6.2.15-100.fc36.x86_64 #1 SMP PREEMPT_DYNAMIC Thu May 11 16:51:53 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
[root@...e ~]#
> Cc: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
> tools/perf/tests/shell/record_bpf_filter.sh | 128 ++++++++++++++++++++
> 1 file changed, 128 insertions(+)
> create mode 100755 tools/perf/tests/shell/record_bpf_filter.sh
>
> diff --git a/tools/perf/tests/shell/record_bpf_filter.sh b/tools/perf/tests/shell/record_bpf_filter.sh
> new file mode 100755
> index 000000000000..e76ea861b92c
> --- /dev/null
> +++ b/tools/perf/tests/shell/record_bpf_filter.sh
> @@ -0,0 +1,128 @@
> +#!/bin/sh
> +# perf record sample filtering (by BPF) tests
> +# SPDX-License-Identifier: GPL-2.0
> +
> +set -e
> +
> +err=0
> +perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
> +
> +cleanup() {
> + rm -f "${perfdata}"
> + rm -f "${perfdata}".old
> + trap - EXIT TERM INT
> +}
> +
> +trap_cleanup() {
> + cleanup
> + exit 1
> +}
> +trap trap_cleanup EXIT TERM INT
> +
> +test_bpf_filter_priv() {
> + echo "Checking BPF-filter privilege"
> +
> + if [ "$(id -u)" != 0 ]
> + then
> + echo "bpf-filter test [Skipped permission]"
> + err=2
> + return
> + fi
> + if ! perf record -e task-clock --filter 'period > 1' \
> + -o /dev/null --quiet true 2>&1
> + then
> + echo "bpf-filter test [Skipped missing BPF support]"
> + err=2
> + return
> + fi
> +}
> +
> +test_bpf_filter_basic() {
> + echo "Basic bpf-filter test"
> +
> + if ! perf record -e task-clock -c 10000 --filter 'ip < 0xffffffff00000000' \
> + -o "${perfdata}" true 2> /dev/null
> + then
> + echo "Basic bpf-filter test [Failed record]"
> + err=1
> + return
> + fi
> + if perf script -i "${perfdata}" -F ip | grep 'ffffffff[0-9a-f]*'
> + then
> + echo "Basic bpf-filter test [Failed invalid output]"
> + err=1
> + return
> + fi
> + echo "Basic bpf-filter test [Success]"
> +}
> +
> +test_bpf_filter_fail() {
> + echo "Failing bpf-filter test"
> +
> + # 'cpu' requires PERF_SAMPLE_CPU flag
> + if ! perf record -e task-clock --filter 'cpu > 0' \
> + -o /dev/null true 2>&1 | grep PERF_SAMPLE_CPU
> + then
> + echo "Failing bpf-filter test [Failed forbidden CPU]"
> + err=1
> + return
> + fi
> +
> + if ! perf record --sample-cpu -e task-clock --filter 'cpu > 0' \
> + -o /dev/null true 2>/dev/null
> + then
> + echo "Failing bpf-filter test [Failed should succeed]"
> + err=1
> + return
> + fi
> +
> + echo "Failing bpf-filter test [Success]"
> +}
> +
> +test_bpf_filter_group() {
> + echo "Group bpf-filter test"
> +
> + if ! perf record -e task-clock --filter 'period > 1000 || ip > 0' \
> + -o /dev/null true 2>/dev/null
> + then
> + echo "Group bpf-filter test [Failed should succeed]"
> + err=1
> + return
> + fi
> +
> + if ! perf record -e task-clock --filter 'cpu > 0 || ip > 0' \
> + -o /dev/null true 2>&1 | grep PERF_SAMPLE_CPU
> + then
> + echo "Group bpf-filter test [Failed forbidden CPU]"
> + err=1
> + return
> + fi
> +
> + if ! perf record -e task-clock --filter 'period > 0 || code_pgsz > 4096' \
> + -o /dev/null true 2>&1 | grep PERF_SAMPLE_CODE_PAGE_SIZE
> + then
> + echo "Group bpf-filter test [Failed forbidden CODE_PAGE_SIZE]"
> + err=1
> + return
> + fi
> +
> + echo "Group bpf-filter test [Success]"
> +}
> +
> +
> +test_bpf_filter_priv
> +
> +if [ $err = 0 ]; then
> + test_bpf_filter_basic
> +fi
> +
> +if [ $err = 0 ]; then
> + test_bpf_filter_fail
> +fi
> +
> +if [ $err = 0 ]; then
> + test_bpf_filter_group
> +fi
> +
> +cleanup
> +exit $err
> --
> 2.41.0.640.ga95def55d0-goog
>
--
- Arnaldo
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