From patchwork Tue Jun 6 03:53:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Hou Tao X-Patchwork-Id: 13268203 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 C9660C7EE32 for ; Tue, 6 Jun 2023 03:21:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234542AbjFFDVD (ORCPT ); Mon, 5 Jun 2023 23:21:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40604 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230362AbjFFDVA (ORCPT ); Mon, 5 Jun 2023 23:21:00 -0400 Received: from dggsgout12.his.huawei.com (unknown [45.249.212.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4355E1B7; Mon, 5 Jun 2023 20:20:56 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.30.67.153]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4QZwjH5hGxz4f3knd; Tue, 6 Jun 2023 11:20:51 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.124.27]) by APP4 (Coremail) with SMTP id gCh0CgBn0LMRpn5kcOYrLA--.7742S6; Tue, 06 Jun 2023 11:20:53 +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: [RFC PATCH bpf-next v4 2/3] selftests/bpf: Add benchmark for bpf memory allocator Date: Tue, 6 Jun 2023 11:53:09 +0800 Message-Id: <20230606035310.4026145-3-houtao@huaweicloud.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20230606035310.4026145-1-houtao@huaweicloud.com> References: <20230606035310.4026145-1-houtao@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: gCh0CgBn0LMRpn5kcOYrLA--.7742S6 X-Coremail-Antispam: 1UD129KBjvAXoWfWFy7KFW7XF4kAr4DKw45ZFb_yoW8ZFWxWo Z3CF45Jr1rWrnFv3ykCas7J3WfuF4vgryUXw15Xan8Ja48Ar1F9ry7Cw4furyxXFWfK34x XFZayw1fArW8XF93n29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7v73VFW2AGmfu7bjvjm3 AaLaJ3UjIYCTnIWjp_UUUYG7kC6x804xWl14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK 8VAvwI8IcIk0rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_Jr yl82xGYIkIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AK xVW0oVCq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ew Av7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY 6r1j6r4UM4x0Y48IcxkI7VAKI48JM4IIrI8v6xkF7I0E8cxan2IY04v7MxAIw28IcxkI7V AKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCj r7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6x IIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAI w20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x 0267AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7IU1sa9DUUUUU== 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) no_op Only create the hash map and there is no operations on hash map. It is used as the baseline. When each CPU completes the iteration of nr_entries / nr_threads elements in hash map, the loop count is increased. (2) overwrite Each CPU overwrites nonoverlapping part of hash map. When each CPU completes overwriting of nr_entries / nr_threads elements in hash map, the loop count is increased. (3) batch_add_batch_del Each CPU adds then deletes nonoverlapping part of hash map in batch. When each CPU adds and deletes nr_entries / nr_threads elements in hash map, the loop count is increased. (4) add_del_on_diff_cpu Each two CPUs add and delete nonoverlapping part of map cooperatively When each two-CPU pair adds and deletes nr_entries / nr_threads * 2 elements in hash map, the loop count is increased twice. The following are 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 --max-entries 16384 ${OPTS} \ --full 50 -d 10 --producers=8 --prod-affinity=0-7 These results show: * preallocated case has both better performance and better memory efficiency. * normal bpf memory doesn't handle add_del_on_diff_cpu very well. The large memory usage is due to the slow tasks trace RCU grace period. (1) non-preallocated + no bpf memory allocator (v6.0.19) use kmalloc() + call_rcu | name | loop (k/s) | average memory (MiB) | peak memory (MiB) | | -- | -- | -- | -- | | no_op | 1214.42 | 0.92 | 0.92 | | overwrite | 3.21 | 40.47 | 67.98 | | batch_add_batch_del | 2.32 | 24.31 | 49.33 | | add_del_on_diff_cpu | 2.92 | 4.03 | 6.00 | (2) preallocated OPTS=--preallocated | name | loop (k/s) | average memory (MiB) | peak memory (MiB) | | -- | -- | -- | -- | | no_op | 1156.59 | 1.88 | 1.88 | | overwrite | 36.19 | 1.88 | 1.88 | | batch_add_batch_del | 22.27 | 1.88 | 1.88 | | add_del_on_diff_cpu | 4.68 | 1.95 | 2.05 | (3) normal bpf memory allocator | name | loop (k/s) | average memory (MiB) | peak memory (MiB) | | -- | -- | -- | -- | | no_op | 1273.55 | 0.98 | 0.98 | | overwrite | 26.57 | 2.59 | 2.74 | | batch_add_batch_del | 11.13 | 2.59 | 2.99 | | add_del_on_diff_cpu | 3.72 | 15.15 | 26.04 | 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 | 352 ++++++++++++++++++ .../bpf/benchs/run_bench_htab_mem.sh | 42 +++ .../selftests/bpf/progs/htab_mem_bench.c | 135 +++++++ 5 files changed, 536 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 538df8fb8c42..add018823ebd 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -644,11 +644,13 @@ $(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 \ @@ -661,6 +663,7 @@ $(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 d9c080ac1796..d3d9ae321b74 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 }, {}, }; @@ -518,6 +520,7 @@ 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, @@ -559,6 +562,7 @@ 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..f0c2505c0868 --- /dev/null +++ b/tools/testing/selftests/bpf/benchs/bench_htab_mem.c @@ -0,0 +1,352 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2023. Huawei Technologies Co., Ltd */ +#include +#include +#include +#include +#include +#include + +#include "bench.h" +#include "cgroup_helpers.h" +#include "htab_mem_bench.skel.h" + +static struct htab_mem_ctx { + struct htab_mem_bench *skel; + pthread_barrier_t *notify; + int fd; + bool do_notify_wait; +} ctx; + +static struct htab_mem_args { + u32 max_entries; + u32 value_size; + u32 full; + const char *use_case; + bool preallocated; +} args = { + .max_entries = 16384, + .full = 50, + .value_size = 8, + .use_case = "overwrite", + .preallocated = false, +}; + +enum { + ARG_MAX_ENTRIES = 10000, + ARG_FULL_PERCENT = 10001, + ARG_VALUE_SIZE = 10002, + ARG_USE_CASE = 10003, + ARG_PREALLOCATED = 10004, +}; + +static const struct argp_option opts[] = { + { "max-entries", ARG_MAX_ENTRIES, "MAX_ENTRIES", 0, + "Set the max entries of hash map (default 16384)" }, + { "full", ARG_FULL_PERCENT, "FULL", 0, + "Set the full percent of hash map (default 50)" }, + { "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: no_op|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_MAX_ENTRIES: + args.max_entries = strtoul(arg, NULL, 10); + break; + case ARG_FULL_PERCENT: + args.full = strtoul(arg, NULL, 10); + if (!args.full || args.full > 100) { + fprintf(stderr, "invalid full percent %u\n", args.full); + argp_usage(state); + } + break; + 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 (env.consumer_cnt != 1) { + fprintf(stderr, "htab mem benchmark doesn't support multi-consumer!\n"); + exit(1); + } +} + +static int setup_and_join_cgroup(const char *path) +{ + int err, fd; + + err = setup_cgroup_environment(); + if (err) { + fprintf(stderr, "setup cgroup env failed\n"); + return -1; + } + + err = create_and_get_cgroup(path); + if (err < 0) { + fprintf(stderr, "create cgroup %s failed\n", path); + goto out; + } + fd = err; + + err = join_cgroup(path); + if (err) { + fprintf(stderr, "join cgroup %s failed\n", path); + close(fd); + goto out; + } + + return fd; +out: + cleanup_cgroup_environment(); + return -1; +} + +static int htab_mem_bench_init_barriers(void) +{ + unsigned int i, nr = (env.producer_cnt + 1) / 2; + pthread_barrier_t *barriers; + + 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 void htab_mem_setup(void) +{ + struct bpf_program *prog; + struct bpf_map *map; + int err; + + setup_libbpf(); + + err = setup_and_join_cgroup("/htab_mem"); + if (err < 0) + exit(1); + ctx.fd = err; + + ctx.skel = htab_mem_bench__open(); + if (!ctx.skel) { + fprintf(stderr, "failed to open skeleton\n"); + goto cleanup; + } + + err = htab_mem_bench_init_barriers(); + if (err) { + fprintf(stderr, "failed to init barrier\n"); + goto cleanup; + } + + map = ctx.skel->maps.htab; + bpf_map__set_max_entries(map, args.max_entries); + bpf_map__set_value_size(map, args.value_size); + if (args.preallocated) + bpf_map__set_map_flags(map, bpf_map__map_flags(map) & ~BPF_F_NO_PREALLOC); + + /* Do synchronization between addition thread and deletion thread */ + if (!strcmp("add_del_on_diff_cpu", args.use_case)) + ctx.do_notify_wait = true; + + prog = bpf_object__find_program_by_name(ctx.skel->obj, args.use_case); + if (!prog) { + fprintf(stderr, "no such use-case: %s\n", args.use_case); + fprintf(stderr, "available use case:"); + bpf_object__for_each_program(prog, ctx.skel->obj) + fprintf(stderr, " %s", bpf_program__name(prog)); + fprintf(stderr, "\n"); + goto cleanup; + } + bpf_program__set_autoload(prog, true); + + ctx.skel->bss->nr_thread = env.producer_cnt; + ctx.skel->bss->nr_entries = (uint64_t)args.max_entries * args.full / 100; + + 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: + close(ctx.fd); + cleanup_cgroup_environment(); + htab_mem_bench_exit_barriers(); + htab_mem_bench__destroy(ctx.skel); + exit(1); +} + +static void htab_mem_notify_wait_producer(pthread_barrier_t *notify) +{ + while (true) { + (void)syscall(__NR_getpgid); + /* Notify for start */ + pthread_barrier_wait(notify); + /* Wait for completion */ + pthread_barrier_wait(notify); + } +} + +static void htab_mem_wait_notify_producer(pthread_barrier_t *notify) +{ + while (true) { + /* Wait for start */ + pthread_barrier_wait(notify); + (void)syscall(__NR_getpgid); + /* Notify for completion */ + pthread_barrier_wait(notify); + } +} + +static void *htab_mem_producer(void *arg) +{ + pthread_barrier_t *notify; + int seq; + + if (!ctx.do_notify_wait) { + while (true) + (void)syscall(__NR_getpgid); + return NULL; + } + + seq = (long)arg; + notify = &ctx.notify[seq / 2]; + if (seq & 1) + htab_mem_notify_wait_producer(notify); + else + htab_mem_wait_notify_producer(notify); + return NULL; +} + +static void *htab_mem_consumer(void *arg) +{ + return NULL; +} + +static void htab_mem_read_mem_cgrp_file(const char *name, unsigned long *value) +{ + char buf[32]; + int fd; + + fd = openat(ctx.fd, name, O_RDONLY); + if (fd < 0) { + fprintf(stderr, "no %s\n", name); + *value = 0; + return; + } + + buf[sizeof(buf) - 1] = 0; + read(fd, buf, sizeof(buf) - 1); + *value = strtoull(buf, NULL, 0); + + close(fd); +} + +static void htab_mem_measure(struct bench_res *res) +{ + res->hits = atomic_swap(&ctx.skel->bss->loop_cnt, 0); + 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("loop %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: loop %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); +} + +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, + .consumer_thread = htab_mem_consumer, + .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..b488cd7ec646 --- /dev/null +++ b/tools/testing/selftests/bpf/benchs/run_bench_htab_mem.sh @@ -0,0 +1,42 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 + +source ./benchs/run_common.sh + +set -eufo pipefail + +htab_mem() +{ + echo -n "loop : " + echo -n "$*" | sed -E "s/.* loop\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 $summary)" +} + +htab_mem_bench() +{ + local name + + for name in no_op overwrite batch_add_batch_del add_del_on_diff_cpu + do + summarize_htab_mem "$name" "$(sudo ./bench htab-mem --use-case $name \ + --max-entries 16384 --full 50 -d 10 \ + --producers=8 --prod-affinity=0-7 "$@")" + 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..fe5c0edb262e --- /dev/null +++ b/tools/testing/selftests/bpf/progs/htab_mem_bench.c @@ -0,0 +1,135 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2023. Huawei Technologies Co., Ltd */ +#include +#include +#include +#include +#include +#include + +struct update_ctx { + unsigned int from; + unsigned int step; + unsigned int max; +}; + +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_entries = 0; +unsigned int nr_thread = 0; +long loop_cnt = 0; + +static int noop_htab(unsigned int i, struct update_ctx *ctx) +{ + if (ctx->from >= ctx->max) + return 1; + + ctx->from += ctx->step; + return 0; +} + +static int write_htab(unsigned int i, struct update_ctx *ctx, unsigned int flags) +{ + if (ctx->from >= ctx->max) + return 1; + + 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) +{ + if (ctx->from >= ctx->max) + return 1; + + bpf_map_delete_elem(&htab, &ctx->from); + ctx->from += ctx->step; + + return 0; +} + +SEC("?tp/syscalls/sys_enter_getpgid") +int no_op(void *ctx) +{ + struct update_ctx update; + + update.from = bpf_get_smp_processor_id(); + update.step = nr_thread; + update.max = nr_entries; + bpf_loop(update.max, noop_htab, &update, 0); + __sync_fetch_and_add(&loop_cnt, 1); + + 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; + update.max = nr_entries; + bpf_loop(update.max, overwrite_htab, &update, 0); + /* Increase when nr_entries / nr_thread elements are deleted and then added */ + __sync_fetch_and_add(&loop_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; + update.max = nr_entries; + bpf_loop(update.max, overwrite_htab, &update, 0); + + update.from = bpf_get_smp_processor_id(); + bpf_loop(update.max, del_htab, &update, 0); + + /* Increase when nr_entries / nr_thread elements are added and then deleted */ + __sync_fetch_and_add(&loop_cnt, 1); + return 0; +} + +SEC("?tp/syscalls/sys_enter_getpgid") +int add_del_on_diff_cpu(void *ctx) +{ + struct update_ctx update; + unsigned int from; + + from = bpf_get_smp_processor_id(); + update.from = from / 2; + update.step = nr_thread / 2; + update.max = nr_entries; + + if (from & 1) + bpf_loop(update.max, newwrite_htab, &update, 0); + else + bpf_loop(update.max, del_htab, &update, 0); + + /* Increase when nr_entries / nr_thread * 2 elements are added or deleted */ + __sync_fetch_and_add(&loop_cnt, 1); + return 0; +}