92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2022 Meta Platforms, Inc. and affiliates.
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* Copyright (c) 2022 Tejun Heo <tj@kernel.org>
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* Copyright (c) 2022 David Vernet <dvernet@meta.com>
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <signal.h>
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#include <libgen.h>
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#include <bpf/bpf.h>
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#include "scx_common.h"
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#include "scx_simple.skel.h"
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const char help_fmt[] =
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"A simple sched_ext scheduler.\n"
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"\n"
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"See the top-level comment in .bpf.c for more details.\n"
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"\n"
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"Usage: %s\n"
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"\n"
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" -h Display this help and exit\n";
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static volatile int exit_req;
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static void sigint_handler(int simple)
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{
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exit_req = 1;
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}
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static void read_stats(struct scx_simple *skel, __u64 *stats)
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{
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int nr_cpus = libbpf_num_possible_cpus();
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__u64 cnts[2][nr_cpus];
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__u32 idx;
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memset(stats, 0, sizeof(stats[0]) * 2);
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for (idx = 0; idx < 2; idx++) {
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int ret, cpu;
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ret = bpf_map_lookup_elem(bpf_map__fd(skel->maps.stats),
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&idx, cnts[idx]);
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if (ret < 0)
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continue;
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for (cpu = 0; cpu < nr_cpus; cpu++)
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stats[idx] += cnts[idx][cpu];
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}
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}
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int main(int argc, char **argv)
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{
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struct scx_simple *skel;
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struct bpf_link *link;
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__u32 opt;
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signal(SIGINT, sigint_handler);
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signal(SIGTERM, sigint_handler);
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libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
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skel = scx_simple__open();
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SCX_BUG_ON(!skel, "Failed to open skel");
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while ((opt = getopt(argc, argv, "h")) != -1) {
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switch (opt) {
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default:
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fprintf(stderr, help_fmt, basename(argv[0]));
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return opt != 'h';
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}
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}
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SCX_BUG_ON(scx_simple__load(skel), "Failed to load skel");
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link = bpf_map__attach_struct_ops(skel->maps.simple_ops);
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SCX_BUG_ON(!link, "Failed to attach struct_ops");
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while (!exit_req && !uei_exited(&skel->bss->uei)) {
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__u64 stats[2];
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read_stats(skel, stats);
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printf("local=%llu global=%llu\n", stats[0], stats[1]);
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fflush(stdout);
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sleep(1);
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}
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bpf_link__destroy(link);
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uei_print(&skel->bss->uei);
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scx_simple__destroy(skel);
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return 0;
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}
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