From patchwork Wed Jun 28 11:59:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Hou Tao X-Patchwork-Id: 13295590 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 670CBEB64DD for ; Wed, 28 Jun 2023 11:27:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231654AbjF1L1H (ORCPT ); Wed, 28 Jun 2023 07:27:07 -0400 Received: from dggsgout12.his.huawei.com ([45.249.212.56]:11138 "EHLO dggsgout12.his.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231395AbjF1L1D (ORCPT ); Wed, 28 Jun 2023 07:27:03 -0400 Received: from mail02.huawei.com (unknown [172.30.67.143]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4QrfS30n0Cz4f3sYt; Wed, 28 Jun 2023 19:26:59 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.124.27]) by APP4 (Coremail) with SMTP id gCh0CgBn0LP_GJxk+A_oMg--.17043S6; Wed, 28 Jun 2023 19:27:01 +0800 (CST) From: Hou Tao To: bpf@vger.kernel.org, Martin KaFai Lau , Alexei Starovoitov Cc: Andrii Nakryiko , Song Liu , Hao Luo , Yonghong Song , Daniel Borkmann , KP Singh , Stanislav Fomichev , Jiri Olsa , John Fastabend , "Paul E . McKenney" , rcu@vger.kernel.org, houtao1@huawei.com Subject: [PATCH bpf-next v7 2/2] selftests/bpf: Add benchmark for bpf memory allocator Date: Wed, 28 Jun 2023 19:59:10 +0800 Message-Id: <20230628115910.3817966-3-houtao@huaweicloud.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20230628115910.3817966-1-houtao@huaweicloud.com> References: <20230628115910.3817966-1-houtao@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: gCh0CgBn0LP_GJxk+A_oMg--.17043S6 X-Coremail-Antispam: 1UD129KBjvAXoWfGw13uw4xGrWxur13Cw1xZrb_yoW8CFWfGo Z3CF45JF18JrnFv3ykCFn7J3WfuF4q9ryDZw1UJ3Z8ZFy8Cr1ruryxCw4fZryxXFWfK34x XFZ3t34fZrW8XF97n29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7v73VFW2AGmfu7bjvjm3 AaLaJ3UjIYCTnIWjp_UUUYX7kC6x804xWl14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK 8VAvwI8IcIk0rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_Jr yl82xGYIkIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AK xVW0oVCq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ew Av7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY 6r1j6r4UM4x0Y48IcxkI7VAKI48JM4IIrI8v6xkF7I0E8cxan2IY04v7MxAIw28IcxkI7V AKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCj r7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6x IIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAI w20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x 0267AKxVW8Jr0_Cr1UYxBIdaVFxhVjvjDU0xZFpf9x07UC9aPUUUUU= X-CM-SenderInfo: xkrx3t3r6k3tpzhluzxrxghudrp/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: Hou Tao The benchmark could be used to compare the performance of hash map operations and the memory usage between different flavors of bpf memory allocator (e.g., no bpf ma vs bpf ma vs reuse-after-gp bpf ma). It also could be used to check the performance improvement or the memory saving provided by optimization. The benchmark creates a non-preallocated hash map which uses bpf memory allocator and shows the operation performance and the memory usage of the hash map under different use cases: (1) overwrite Each CPU overwrites nonoverlapping part of hash map. When each CPU completes overwriting of 64 elements in hash map, it increases the op_count. (2) batch_add_batch_del Each CPU adds then deletes nonoverlapping part of hash map in batch. When each CPU adds and deletes 64 elements in hash map, it increases the op_count twice. (3) add_del_on_diff_cpu Each two-CPUs pair adds and deletes nonoverlapping part of map cooperatively. When each CPU adds or deletes 64 elements in hash map, it will increase the op_count. The following is the benchmark results when comparing between different flavors of bpf memory allocator. These tests are conducted on a KVM guest with 8 CPUs and 16 GB memory. The command line below is used to do all the following benchmarks: ./bench htab-mem --use-case $name ${OPTS} -w3 -d10 -a -p8 These results show that preallocated hash map has both better performance and smaller memory footprint. (1) non-preallocated + no bpf memory allocator (v6.0.19) use kmalloc() + call_rcu overwrite per-prod-op: 11.24 ± 0.07k/s, avg mem: 82.64 ± 26.32MiB, peak mem: 119.18MiB batch_add_batch_del per-prod-op: 18.45 ± 0.10k/s, avg mem: 50.47 ± 14.51MiB, peak mem: 94.96MiB add_del_on_diff_cpu per-prod-op: 14.50 ± 0.03k/s, avg mem: 4.64 ± 0.73MiB, peak mem: 7.20MiB (2) preallocated OPTS=--preallocated overwrite per-prod-op: 191.42 ± 0.09k/s, avg mem: 1.24 ± 0.00MiB, peak mem: 1.49MiB batch_add_batch_del per-prod-op: 221.83 ± 0.17k/s, avg mem: 1.23 ± 0.00MiB, peak mem: 1.49MiB add_del_on_diff_cpu per-prod-op: 39.66 ± 0.31k/s, avg mem: 1.47 ± 0.13MiB, peak mem: 1.75MiB (3) normal bpf memory allocator overwrite per-prod-op: 126.59 ± 0.02k/s, avg mem: 2.26 ± 0.00MiB, peak mem: 2.74MiB batch_add_batch_del per-prod-op: 83.37 ± 0.20k/s, avg mem: 2.14 ± 0.17MiB, peak mem: 2.74MiB add_del_on_diff_cpu per-prod-op: 21.25 ± 0.24k/s, avg mem: 17.50 ± 3.32MiB, peak mem: 28.87MiB Signed-off-by: Hou Tao --- tools/testing/selftests/bpf/Makefile | 3 + tools/testing/selftests/bpf/bench.c | 4 + .../selftests/bpf/benchs/bench_htab_mem.c | 345 ++++++++++++++++++ .../bpf/benchs/run_bench_htab_mem.sh | 40 ++ .../selftests/bpf/progs/htab_mem_bench.c | 105 ++++++ 5 files changed, 497 insertions(+) create mode 100644 tools/testing/selftests/bpf/benchs/bench_htab_mem.c create mode 100755 tools/testing/selftests/bpf/benchs/run_bench_htab_mem.sh create mode 100644 tools/testing/selftests/bpf/progs/htab_mem_bench.c diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index 28d2c77262be..e49234bba02e 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -645,11 +645,13 @@ $(OUTPUT)/bench_local_storage.o: $(OUTPUT)/local_storage_bench.skel.h $(OUTPUT)/bench_local_storage_rcu_tasks_trace.o: $(OUTPUT)/local_storage_rcu_tasks_trace_bench.skel.h $(OUTPUT)/bench_local_storage_create.o: $(OUTPUT)/bench_local_storage_create.skel.h $(OUTPUT)/bench_bpf_hashmap_lookup.o: $(OUTPUT)/bpf_hashmap_lookup.skel.h +$(OUTPUT)/bench_htab_mem.o: $(OUTPUT)/htab_mem_bench.skel.h $(OUTPUT)/bench.o: bench.h testing_helpers.h $(BPFOBJ) $(OUTPUT)/bench: LDLIBS += -lm $(OUTPUT)/bench: $(OUTPUT)/bench.o \ $(TESTING_HELPERS) \ $(TRACE_HELPERS) \ + $(CGROUP_HELPERS) \ $(OUTPUT)/bench_count.o \ $(OUTPUT)/bench_rename.o \ $(OUTPUT)/bench_trigger.o \ @@ -662,6 +664,7 @@ $(OUTPUT)/bench: $(OUTPUT)/bench.o \ $(OUTPUT)/bench_local_storage_rcu_tasks_trace.o \ $(OUTPUT)/bench_bpf_hashmap_lookup.o \ $(OUTPUT)/bench_local_storage_create.o \ + $(OUTPUT)/bench_htab_mem.o \ # $(call msg,BINARY,,$@) $(Q)$(CC) $(CFLAGS) $(LDFLAGS) $(filter %.a %.o,$^) $(LDLIBS) -o $@ diff --git a/tools/testing/selftests/bpf/bench.c b/tools/testing/selftests/bpf/bench.c index 41fe5a82b88b..73ce11b0547d 100644 --- a/tools/testing/selftests/bpf/bench.c +++ b/tools/testing/selftests/bpf/bench.c @@ -279,6 +279,7 @@ extern struct argp bench_local_storage_rcu_tasks_trace_argp; extern struct argp bench_strncmp_argp; extern struct argp bench_hashmap_lookup_argp; extern struct argp bench_local_storage_create_argp; +extern struct argp bench_htab_mem_argp; static const struct argp_child bench_parsers[] = { { &bench_ringbufs_argp, 0, "Ring buffers benchmark", 0 }, @@ -290,6 +291,7 @@ static const struct argp_child bench_parsers[] = { "local_storage RCU Tasks Trace slowdown benchmark", 0 }, { &bench_hashmap_lookup_argp, 0, "Hashmap lookup benchmark", 0 }, { &bench_local_storage_create_argp, 0, "local-storage-create benchmark", 0 }, + { &bench_htab_mem_argp, 0, "hash map memory benchmark", 0 }, {}, }; @@ -520,6 +522,7 @@ extern const struct bench bench_local_storage_cache_hashmap_control; extern const struct bench bench_local_storage_tasks_trace; extern const struct bench bench_bpf_hashmap_lookup; extern const struct bench bench_local_storage_create; +extern const struct bench bench_htab_mem; static const struct bench *benchs[] = { &bench_count_global, @@ -561,6 +564,7 @@ static const struct bench *benchs[] = { &bench_local_storage_tasks_trace, &bench_bpf_hashmap_lookup, &bench_local_storage_create, + &bench_htab_mem, }; static void find_benchmark(void) diff --git a/tools/testing/selftests/bpf/benchs/bench_htab_mem.c b/tools/testing/selftests/bpf/benchs/bench_htab_mem.c new file mode 100644 index 000000000000..0061765bf335 --- /dev/null +++ b/tools/testing/selftests/bpf/benchs/bench_htab_mem.c @@ -0,0 +1,345 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2023. Huawei Technologies Co., Ltd */ +#include +#include +#include +#include +#include +#include + +#include "bench.h" +#include "bpf_util.h" +#include "cgroup_helpers.h" +#include "htab_mem_bench.skel.h" + +struct htab_mem_use_case { + const char *name; + const char **progs; + /* Do synchronization between addition thread and deletion thread */ + bool need_sync; +}; + +static struct htab_mem_ctx { + const struct htab_mem_use_case *uc; + struct htab_mem_bench *skel; + pthread_barrier_t *notify; + int fd; +} ctx; + +const char *ow_progs[] = {"overwrite", NULL}; +const char *batch_progs[] = {"batch_add_batch_del", NULL}; +const char *add_del_progs[] = {"add_only", "del_only", NULL}; +const static struct htab_mem_use_case use_cases[] = { + { .name = "overwrite", .progs = ow_progs }, + { .name = "batch_add_batch_del", .progs = batch_progs }, + { .name = "add_del_on_diff_cpu", .progs = add_del_progs, .need_sync = true }, +}; + +static struct htab_mem_args { + u32 value_size; + const char *use_case; + bool preallocated; +} args = { + .value_size = 8, + .use_case = use_cases[0].name, + .preallocated = false, +}; + +enum { + ARG_VALUE_SIZE = 10000, + ARG_USE_CASE = 10001, + ARG_PREALLOCATED = 10002, +}; + +static const struct argp_option opts[] = { + { "value-size", ARG_VALUE_SIZE, "VALUE_SIZE", 0, + "Set the value size of hash map (default 8)" }, + { "use-case", ARG_USE_CASE, "USE_CASE", 0, + "Set the use case of hash map: overwrite|batch_add_batch_del|add_del_on_diff_cpu" }, + { "preallocated", ARG_PREALLOCATED, NULL, 0, "use preallocated hash map" }, + {}, +}; + +static error_t htab_mem_parse_arg(int key, char *arg, struct argp_state *state) +{ + switch (key) { + case ARG_VALUE_SIZE: + args.value_size = strtoul(arg, NULL, 10); + if (args.value_size > 4096) { + fprintf(stderr, "too big value size %u\n", args.value_size); + argp_usage(state); + } + break; + case ARG_USE_CASE: + args.use_case = strdup(arg); + break; + case ARG_PREALLOCATED: + args.preallocated = true; + break; + default: + return ARGP_ERR_UNKNOWN; + } + + return 0; +} + +const struct argp bench_htab_mem_argp = { + .options = opts, + .parser = htab_mem_parse_arg, +}; + +static void htab_mem_validate(void) +{ + if (!strcmp(use_cases[2].name, args.use_case) && env.producer_cnt % 2) { + fprintf(stderr, "%s needs an even number of producers\n", args.use_case); + exit(1); + } +} + +static int htab_mem_bench_init_barriers(void) +{ + pthread_barrier_t *barriers; + unsigned int i, nr; + + if (!ctx.uc->need_sync) + return 0; + + nr = (env.producer_cnt + 1) / 2; + barriers = calloc(nr, sizeof(*barriers)); + if (!barriers) + return -1; + + /* Used for synchronization between two threads */ + for (i = 0; i < nr; i++) + pthread_barrier_init(&barriers[i], NULL, 2); + + ctx.notify = barriers; + return 0; +} + +static void htab_mem_bench_exit_barriers(void) +{ + unsigned int i, nr; + + if (!ctx.notify) + return; + + nr = (env.producer_cnt + 1) / 2; + for (i = 0; i < nr; i++) + pthread_barrier_destroy(&ctx.notify[i]); + free(ctx.notify); +} + +static const struct htab_mem_use_case *htab_mem_find_use_case_or_exit(const char *name) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(use_cases); i++) { + if (!strcmp(name, use_cases[i].name)) + return &use_cases[i]; + } + + fprintf(stderr, "no such use-case: %s\n", name); + fprintf(stderr, "available use case:"); + for (i = 0; i < ARRAY_SIZE(use_cases); i++) + fprintf(stderr, " %s", use_cases[i].name); + fprintf(stderr, "\n"); + exit(1); +} + +static void htab_mem_setup(void) +{ + struct bpf_map *map; + const char **names; + int err; + + setup_libbpf(); + + ctx.uc = htab_mem_find_use_case_or_exit(args.use_case); + err = htab_mem_bench_init_barriers(); + if (err) { + fprintf(stderr, "failed to init barrier\n"); + exit(1); + } + + ctx.fd = cgroup_setup_and_join("/htab_mem"); + if (ctx.fd < 0) + goto cleanup; + + ctx.skel = htab_mem_bench__open(); + if (!ctx.skel) { + fprintf(stderr, "failed to open skeleton\n"); + goto cleanup; + } + + map = ctx.skel->maps.htab; + bpf_map__set_value_size(map, args.value_size); + /* Ensure that different CPUs can operate on different subset */ + bpf_map__set_max_entries(map, max(8192, 64 * env.nr_cpus)); + if (args.preallocated) + bpf_map__set_map_flags(map, bpf_map__map_flags(map) & ~BPF_F_NO_PREALLOC); + + names = ctx.uc->progs; + while (*names) { + struct bpf_program *prog; + + prog = bpf_object__find_program_by_name(ctx.skel->obj, *names); + if (!prog) { + fprintf(stderr, "no such program %s\n", *names); + goto cleanup; + } + bpf_program__set_autoload(prog, true); + names++; + } + ctx.skel->bss->nr_thread = env.producer_cnt; + + err = htab_mem_bench__load(ctx.skel); + if (err) { + fprintf(stderr, "failed to load skeleton\n"); + goto cleanup; + } + err = htab_mem_bench__attach(ctx.skel); + if (err) { + fprintf(stderr, "failed to attach skeleton\n"); + goto cleanup; + } + return; + +cleanup: + htab_mem_bench__destroy(ctx.skel); + htab_mem_bench_exit_barriers(); + if (ctx.fd >= 0) { + close(ctx.fd); + cleanup_cgroup_environment(); + } + exit(1); +} + +static void htab_mem_add_fn(pthread_barrier_t *notify) +{ + while (true) { + /* Do addition */ + (void)syscall(__NR_getpgid, 0); + /* Notify deletion thread to do deletion */ + pthread_barrier_wait(notify); + /* Wait for deletion to complete */ + pthread_barrier_wait(notify); + } +} + +static void htab_mem_delete_fn(pthread_barrier_t *notify) +{ + while (true) { + /* Wait for addition to complete */ + pthread_barrier_wait(notify); + /* Do deletion */ + (void)syscall(__NR_getppid); + /* Notify addition thread to do addition */ + pthread_barrier_wait(notify); + } +} + +static void *htab_mem_producer(void *arg) +{ + pthread_barrier_t *notify; + int seq; + + if (!ctx.uc->need_sync) { + while (true) + (void)syscall(__NR_getpgid, 0); + return NULL; + } + + seq = (long)arg; + notify = &ctx.notify[seq / 2]; + if (seq & 1) + htab_mem_delete_fn(notify); + else + htab_mem_add_fn(notify); + return NULL; +} + +static void htab_mem_read_mem_cgrp_file(const char *name, unsigned long *value) +{ + char buf[32]; + ssize_t got; + int fd; + + fd = openat(ctx.fd, name, O_RDONLY); + if (fd < 0) { + /* cgroup v1 ? */ + fprintf(stderr, "no %s\n", name); + *value = 0; + return; + } + + got = read(fd, buf, sizeof(buf) - 1); + if (got <= 0) { + *value = 0; + return; + } + buf[got] = 0; + + *value = strtoull(buf, NULL, 0); + + close(fd); +} + +static void htab_mem_measure(struct bench_res *res) +{ + res->hits = atomic_swap(&ctx.skel->bss->op_cnt, 0) / env.producer_cnt; + htab_mem_read_mem_cgrp_file("memory.current", &res->gp_ct); +} + +static void htab_mem_report_progress(int iter, struct bench_res *res, long delta_ns) +{ + double loop, mem; + + loop = res->hits / 1000.0 / (delta_ns / 1000000000.0); + mem = res->gp_ct / 1048576.0; + printf("Iter %3d (%7.3lfus): ", iter, (delta_ns - 1000000000) / 1000.0); + printf("per-prod-op %7.2lfk/s, memory usage %7.2lfMiB\n", loop, mem); +} + +static void htab_mem_report_final(struct bench_res res[], int res_cnt) +{ + double mem_mean = 0.0, mem_stddev = 0.0; + double loop_mean = 0.0, loop_stddev = 0.0; + unsigned long peak_mem; + int i; + + for (i = 0; i < res_cnt; i++) { + loop_mean += res[i].hits / 1000.0 / (0.0 + res_cnt); + mem_mean += res[i].gp_ct / 1048576.0 / (0.0 + res_cnt); + } + if (res_cnt > 1) { + for (i = 0; i < res_cnt; i++) { + loop_stddev += (loop_mean - res[i].hits / 1000.0) * + (loop_mean - res[i].hits / 1000.0) / + (res_cnt - 1.0); + mem_stddev += (mem_mean - res[i].gp_ct / 1048576.0) * + (mem_mean - res[i].gp_ct / 1048576.0) / + (res_cnt - 1.0); + } + loop_stddev = sqrt(loop_stddev); + mem_stddev = sqrt(mem_stddev); + } + + htab_mem_read_mem_cgrp_file("memory.peak", &peak_mem); + printf("Summary: per-prod-op %7.2lf \u00B1 %7.2lfk/s, memory usage %7.2lf \u00B1 %7.2lfMiB," + " peak memory usage %7.2lfMiB\n", + loop_mean, loop_stddev, mem_mean, mem_stddev, peak_mem / 1048576.0); + + cleanup_cgroup_environment(); +} + +const struct bench bench_htab_mem = { + .name = "htab-mem", + .argp = &bench_htab_mem_argp, + .validate = htab_mem_validate, + .setup = htab_mem_setup, + .producer_thread = htab_mem_producer, + .measure = htab_mem_measure, + .report_progress = htab_mem_report_progress, + .report_final = htab_mem_report_final, +}; diff --git a/tools/testing/selftests/bpf/benchs/run_bench_htab_mem.sh b/tools/testing/selftests/bpf/benchs/run_bench_htab_mem.sh new file mode 100755 index 000000000000..9ff5832463a2 --- /dev/null +++ b/tools/testing/selftests/bpf/benchs/run_bench_htab_mem.sh @@ -0,0 +1,40 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 + +source ./benchs/run_common.sh + +set -eufo pipefail + +htab_mem() +{ + echo -n "per-prod-op: " + echo -n "$*" | sed -E "s/.* per-prod-op\s+([0-9]+\.[0-9]+ ± [0-9]+\.[0-9]+k\/s).*/\1/" + echo -n -e ", avg mem: " + echo -n "$*" | sed -E "s/.* memory usage\s+([0-9]+\.[0-9]+ ± [0-9]+\.[0-9]+MiB).*/\1/" + echo -n ", peak mem: " + echo "$*" | sed -E "s/.* peak memory usage\s+([0-9]+\.[0-9]+MiB).*/\1/" +} + +summarize_htab_mem() +{ + local bench="$1" + local summary=$(echo $2 | tail -n1) + + printf "%-20s %s\n" "$bench" "$(htab_mem $summary)" +} + +htab_mem_bench() +{ + local name + + for name in overwrite batch_add_batch_del add_del_on_diff_cpu + do + summarize_htab_mem "$name" "$($RUN_BENCH htab-mem --use-case $name -p8 "$@")" + done +} + +header "preallocated" +htab_mem_bench "--preallocated" + +header "normal bpf ma" +htab_mem_bench diff --git a/tools/testing/selftests/bpf/progs/htab_mem_bench.c b/tools/testing/selftests/bpf/progs/htab_mem_bench.c new file mode 100644 index 000000000000..b1b721b14d67 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/htab_mem_bench.c @@ -0,0 +1,105 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2023. Huawei Technologies Co., Ltd */ +#include +#include +#include +#include +#include +#include + +#define OP_BATCH 64 + +struct update_ctx { + unsigned int from; + unsigned int step; +}; + +struct { + __uint(type, BPF_MAP_TYPE_HASH); + __uint(key_size, 4); + __uint(map_flags, BPF_F_NO_PREALLOC); +} htab SEC(".maps"); + +char _license[] SEC("license") = "GPL"; + +unsigned char zeroed_value[4096]; +unsigned int nr_thread = 0; +long op_cnt = 0; + +static int write_htab(unsigned int i, struct update_ctx *ctx, unsigned int flags) +{ + bpf_map_update_elem(&htab, &ctx->from, zeroed_value, flags); + ctx->from += ctx->step; + + return 0; +} + +static int overwrite_htab(unsigned int i, struct update_ctx *ctx) +{ + return write_htab(i, ctx, 0); +} + +static int newwrite_htab(unsigned int i, struct update_ctx *ctx) +{ + return write_htab(i, ctx, BPF_NOEXIST); +} + +static int del_htab(unsigned int i, struct update_ctx *ctx) +{ + bpf_map_delete_elem(&htab, &ctx->from); + ctx->from += ctx->step; + + return 0; +} + +SEC("?tp/syscalls/sys_enter_getpgid") +int overwrite(void *ctx) +{ + struct update_ctx update; + + update.from = bpf_get_smp_processor_id(); + update.step = nr_thread; + bpf_loop(OP_BATCH, overwrite_htab, &update, 0); + __sync_fetch_and_add(&op_cnt, 1); + return 0; +} + +SEC("?tp/syscalls/sys_enter_getpgid") +int batch_add_batch_del(void *ctx) +{ + struct update_ctx update; + + update.from = bpf_get_smp_processor_id(); + update.step = nr_thread; + bpf_loop(OP_BATCH, overwrite_htab, &update, 0); + + update.from = bpf_get_smp_processor_id(); + bpf_loop(OP_BATCH, del_htab, &update, 0); + + __sync_fetch_and_add(&op_cnt, 2); + return 0; +} + +SEC("?tp/syscalls/sys_enter_getpgid") +int add_only(void *ctx) +{ + struct update_ctx update; + + update.from = bpf_get_smp_processor_id() / 2; + update.step = nr_thread / 2; + bpf_loop(OP_BATCH, newwrite_htab, &update, 0); + __sync_fetch_and_add(&op_cnt, 1); + return 0; +} + +SEC("?tp/syscalls/sys_enter_getppid") +int del_only(void *ctx) +{ + struct update_ctx update; + + update.from = bpf_get_smp_processor_id() / 2; + update.step = nr_thread / 2; + bpf_loop(OP_BATCH, del_htab, &update, 0); + __sync_fetch_and_add(&op_cnt, 1); + return 0; +}