mirror of
https://github.com/JakeHillion/scx.git
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e9a9d32ab6
- combine c and kernel-examples as it's confusing to have both - rename 'rust-user' and 'c-user' to just 'rust' and 'c', which is simpler - update and fix sync-to-kernel.sh
107 lines
3.0 KiB
C
107 lines
3.0 KiB
C
/* 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 <stdlib.h>
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#include <unistd.h>
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#include <inttypes.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_qmap.bpf.skel.h"
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const char help_fmt[] =
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"A simple five-level FIFO queue 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 [-s SLICE_US] [-e COUNT] [-t COUNT] [-T COUNT] [-l COUNT] [-d PID] [-p]\n"
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"\n"
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" -s SLICE_US Override slice duration\n"
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" -e COUNT Trigger scx_bpf_error() after COUNT enqueues\n"
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" -t COUNT Stall every COUNT'th user thread\n"
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" -T COUNT Stall every COUNT'th kernel thread\n"
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" -l COUNT Trigger dispatch infinite looping after COUNT dispatches\n"
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" -d PID Disallow a process from switching into SCHED_EXT (-1 for self)\n"
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" -p Switch only tasks on SCHED_EXT policy intead of all\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 dummy)
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{
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exit_req = 1;
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}
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int main(int argc, char **argv)
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{
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struct scx_qmap *skel;
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struct bpf_link *link;
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int 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_qmap__open();
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SCX_BUG_ON(!skel, "Failed to open skel");
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while ((opt = getopt(argc, argv, "s:e:t:T:l:d:ph")) != -1) {
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switch (opt) {
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case 's':
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skel->rodata->slice_ns = strtoull(optarg, NULL, 0) * 1000;
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break;
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case 'e':
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skel->bss->test_error_cnt = strtoul(optarg, NULL, 0);
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break;
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case 't':
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skel->rodata->stall_user_nth = strtoul(optarg, NULL, 0);
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break;
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case 'T':
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skel->rodata->stall_kernel_nth = strtoul(optarg, NULL, 0);
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break;
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case 'l':
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skel->rodata->dsp_inf_loop_after = strtoul(optarg, NULL, 0);
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break;
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case 'd':
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skel->rodata->disallow_tgid = strtol(optarg, NULL, 0);
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if (skel->rodata->disallow_tgid < 0)
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skel->rodata->disallow_tgid = getpid();
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break;
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case 'p':
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skel->rodata->switch_partial = true;
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break;
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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_qmap__load(skel), "Failed to load skel");
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link = bpf_map__attach_struct_ops(skel->maps.qmap_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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long nr_enqueued = skel->bss->nr_enqueued;
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long nr_dispatched = skel->bss->nr_dispatched;
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printf("enq=%lu, dsp=%lu, delta=%ld, reenq=%" PRIu64 ", deq=%" PRIu64 ", core=%" PRIu64 "\n",
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nr_enqueued, nr_dispatched, nr_enqueued - nr_dispatched,
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skel->bss->nr_reenqueued, skel->bss->nr_dequeued,
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skel->bss->nr_core_sched_execed);
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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_qmap__destroy(skel);
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return 0;
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}
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