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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */
#include <argp.h>
#include <limits.h>
#include <string.h>
#include "bench.h"
#include <libarena/common.h>
#include <libarena/asan.h>
#include <libarena/buddy.h>
#include <libarena/userspace.h>
#include "libarena/libarena_bench.skel.h"
static struct {
__u64 alloc_size;
__u64 nallocs;
} args = {
.alloc_size = 64,
.nallocs = 10000,
};
static struct {
struct libarena_bench *skel;
int bench_fd;
int reset_fd;
} ctx;
enum {
ARG_LIBARENA_ALLOC_SIZE = 12000,
ARG_LIBARENA_NALLOCS,
};
static const struct argp_option opts[] = {
{ "alloc_size", ARG_LIBARENA_ALLOC_SIZE, "BYTES", 0,
"Size of each arena allocation" },
{ "nallocs", ARG_LIBARENA_NALLOCS, "ITERS", 0,
"Number of allocation per measurement" },
{},
};
static error_t parse_arg(int key, char *arg, struct argp_state *state)
{
unsigned long value;
switch (key) {
case ARG_LIBARENA_ALLOC_SIZE:
value = strtoull(arg, NULL, 10);
if (!value || value >= UINT_MAX) {
fprintf(stderr, "invalid alloc_size: %ld", value);
argp_usage(state);
}
args.alloc_size = value;
break;
case ARG_LIBARENA_NALLOCS:
args.nallocs = strtoull(arg, NULL, 10);
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
const struct argp bench_libarena_argp = {
.options = opts,
.parser = parse_arg,
};
static void validate(void)
{
if (env.consumer_cnt != 0) {
fprintf(stderr, "benchmark doesn't support consumers\n");
exit(1);
}
if (env.producer_cnt != 1) {
fprintf(stderr, "benchmark supports exactly one producer\n");
exit(1);
}
}
static void setup_common(void)
{
struct arena_alloc_reserve_args reserve_args = {
.nr_pages = ARENA_RESERVE_PAGES_DFL,
};
int err;
setup_libbpf();
ctx.skel = libarena_bench__open_and_load();
if (!ctx.skel) {
fprintf(stderr, "failed to open and load skeleton\n");
exit(1);
}
err = libarena_run_prog_args(
bpf_program__fd(ctx.skel->progs.arena_alloc_reserve),
&reserve_args, sizeof(reserve_args));
if (err) {
fprintf(stderr, "failed to reserve arena pages: %d\n", err);
exit(1);
}
err = libarena_run_prog(
bpf_program__fd(ctx.skel->progs.arena_buddy_reset));
if (err) {
fprintf(stderr, "failed to initialize arena allocator: %d\n", err);
exit(1);
}
ctx.skel->bss->bench_alloc_size = args.alloc_size;
ctx.skel->bss->bench_nallocs = args.nallocs;
ctx.reset_fd = bpf_program__fd(ctx.skel->progs.arena_buddy_reset);
}
static void malloc_setup(void)
{
setup_common();
ctx.bench_fd = bpf_program__fd(ctx.skel->progs.bench_malloc);
}
static void calloc_setup(void)
{
setup_common();
ctx.bench_fd = bpf_program__fd(ctx.skel->progs.bench_calloc);
}
static void *producer(void *input)
{
int err;
while (true) {
err = libarena_run_prog(ctx.bench_fd);
if (err) {
fprintf(stderr, "libarena benchmark failed: %d\n", err);
exit(1);
}
err = libarena_run_prog(ctx.reset_fd);
if (err) {
fprintf(stderr, "libarena alloc reset failed: %d\n", err);
exit(1);
}
}
return NULL;
}
static void measure(struct bench_res *res)
{
res->duration_ns = atomic_swap(&ctx.skel->bss->bench_duration_ns, 0);
res->hits = atomic_swap(&ctx.skel->bss->bench_hits, 0);
}
static void report_progress(int iter, struct bench_res *res, long delta_ns)
{
double latency_ns = 0.0;
if (res->hits)
latency_ns = res->duration_ns / (double)res->hits;
printf("Iter %3d (%7.3lfus): latency %8.3lf ns/op (%ld allocations)\n",
iter, (delta_ns - 1000000000) / 1000.0, latency_ns, res->hits);
}
static void report_final(struct bench_res res[], int res_cnt)
{
unsigned long duration_ns = 0;
long hits = 0;
int i;
for (i = 0; i < res_cnt; i++) {
duration_ns += res[i].duration_ns;
hits += res[i].hits;
}
if (!hits || !res_cnt) {
printf("Summary: no runs measured\n");
return;
}
printf("Summary: %.3lf ns/op, %.0lf invocations for %u allocations/invocation)\n",
duration_ns / (double)hits, hits / (double)res_cnt,
ctx.skel->bss->bench_nallocs);
}
const struct bench bench_libarena_malloc = {
.name = "libarena-malloc",
.argp = &bench_libarena_argp,
.validate = validate,
.setup = malloc_setup,
.producer_thread = producer,
.measure = measure,
.report_progress = report_progress,
.report_final = report_final,
};
const struct bench bench_libarena_calloc = {
.name = "libarena-calloc",
.argp = &bench_libarena_argp,
.validate = validate,
.setup = calloc_setup,
.producer_thread = producer,
.measure = measure,
.report_progress = report_progress,
.report_final = report_final,
};
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