linux-kernel - Re: [External] Re: [PATCH v2 2/2] selftest/bpf/benchs: Add bpf

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Date:   Thu, 26 May 2022 10:08:51 +0800
From:   Feng Zhou <zhoufeng.zf@...edance.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, Martin Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        duanxiongchun@...edance.com,
        Muchun Song <songmuchun@...edance.com>,
        Dongdong Wang <wangdongdong.6@...edance.com>,
        Cong Wang <cong.wang@...edance.com>,
        zhouchengming@...edance.com
Subject: Re: [External] Re: [PATCH v2 2/2] selftest/bpf/benchs: Add bpf_map
 benchmark

在 2022/5/25 上午7:29, Andrii Nakryiko 写道:
> On Tue, May 24, 2022 at 12:53 AM Feng zhou <zhoufeng.zf@...edance.com> wrote:
>> From: Feng Zhou <zhoufeng.zf@...edance.com>
>>
>> Add benchmark for hash_map to reproduce the worst case
>> that non-stop update when map's free is zero.
>>
>> Signed-off-by: Feng Zhou <zhoufeng.zf@...edance.com>
>> ---
>>   tools/testing/selftests/bpf/Makefile          |  4 +-
>>   tools/testing/selftests/bpf/bench.c           |  2 +
>>   .../selftests/bpf/benchs/bench_bpf_map.c      | 78 +++++++++++++++++++
>>   .../selftests/bpf/benchs/run_bench_bpf_map.sh | 10 +++
>>   .../selftests/bpf/progs/bpf_map_bench.c       | 27 +++++++
>>   5 files changed, 120 insertions(+), 1 deletion(-)
>>   create mode 100644 tools/testing/selftests/bpf/benchs/bench_bpf_map.c
>>   create mode 100755 tools/testing/selftests/bpf/benchs/run_bench_bpf_map.sh
>>   create mode 100644 tools/testing/selftests/bpf/progs/bpf_map_bench.c
>>
> [...]
>
>> +static void setup(void)
>> +{
>> +       struct bpf_link *link;
>> +       int map_fd, i, max_entries;
>> +
>> +       setup_libbpf();
>> +
>> +       ctx.skel = bpf_map_bench__open_and_load();
>> +       if (!ctx.skel) {
>> +               fprintf(stderr, "failed to open skeleton\n");
>> +               exit(1);
>> +       }
>> +
>> +       link = bpf_program__attach(ctx.skel->progs.benchmark);
>> +       if (!link) {
>> +               fprintf(stderr, "failed to attach program!\n");
>> +               exit(1);
>> +       }
>> +
>> +       //fill hash_map
> don't use C++ comments

Ok, will do. Thanks.

>
>> +       map_fd = bpf_map__fd(ctx.skel->maps.hash_map_bench);
>> +       max_entries = bpf_map__max_entries(ctx.skel->maps.hash_map_bench);
>> +       for (i = 0; i < max_entries; i++)
>> +               bpf_map_update_elem(map_fd, &i, &i, BPF_ANY);
>> +}
>> +
>> +const struct bench bench_bpf_map = {
>> +       .name = "bpf-map",
> this is too generic name, it's testing one particular scenario, so
> call this out in the name. bpf-hashmap-full-update or something (same
> for all the relevant function and file names)
>

Ok, will do. Thanks.

>> +       .validate = validate,
>> +       .setup = setup,
>> +       .producer_thread = producer,
>> +       .consumer_thread = consumer,
>> +       .measure = measure,
>> +       .report_progress = ops_report_progress,
>> +       .report_final = ops_report_final,
>> +};
>> diff --git a/tools/testing/selftests/bpf/benchs/run_bench_bpf_map.sh b/tools/testing/selftests/bpf/benchs/run_bench_bpf_map.sh
>> new file mode 100755
>> index 000000000000..d7cc969e4f85
>> --- /dev/null
>> +++ b/tools/testing/selftests/bpf/benchs/run_bench_bpf_map.sh
>> @@ -0,0 +1,10 @@
>> +#!/bin/bash
>> +# SPDX-License-Identifier: GPL-2.0
>> +
>> +source ./benchs/run_common.sh
>> +
>> +set -eufo pipefail
>> +
>> +nr_threads=`expr $(cat /proc/cpuinfo | grep "processor"| wc -l) - 1`
>> +summary=$($RUN_BENCH -p $nr_threads bpf-map)
>> +printf "$summary"
>> diff --git a/tools/testing/selftests/bpf/progs/bpf_map_bench.c b/tools/testing/selftests/bpf/progs/bpf_map_bench.c
>> new file mode 100644
>> index 000000000000..655366e6e0f4
>> --- /dev/null
>> +++ b/tools/testing/selftests/bpf/progs/bpf_map_bench.c
>> @@ -0,0 +1,27 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/* Copyright (c) 2022 Bytedance */
>> +
>> +#include "vmlinux.h"
>> +#include <bpf/bpf_helpers.h>
>> +#include "bpf_misc.h"
>> +
>> +char _license[] SEC("license") = "GPL";
>> +
>> +#define MAX_ENTRIES 1000
>> +
>> +struct {
>> +       __uint(type, BPF_MAP_TYPE_HASH);
>> +       __type(key, u32);
>> +       __type(value, u64);
>> +       __uint(max_entries, MAX_ENTRIES);
>> +} hash_map_bench SEC(".maps");
>> +
>> +SEC("fentry/" SYS_PREFIX "sys_getpgid")
>> +int benchmark(void *ctx)
>> +{
>> +       u32 key = bpf_get_prandom_u32();
>> +       u64 init_val = 1;
>> +
>> +       bpf_map_update_elem(&hash_map_bench, &key, &init_val, BPF_ANY);
>> +       return 0;
>> +}
>> --
>> 2.20.1
>>