1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2022 Meta Platforms, Inc. and affiliates. 4 * Copyright (c) 2022 Tejun Heo <tj@kernel.org> 5 * Copyright (c) 2022 David Vernet <dvernet@meta.com> 6 */ 7 #include <stdio.h> 8 #include <stdlib.h> 9 #include <unistd.h> 10 #include <inttypes.h> 11 #include <signal.h> 12 #include <libgen.h> 13 #include <bpf/bpf.h> 14 #include <scx/common.h> 15 #include "scx_qmap.bpf.skel.h" 16 17 const char help_fmt[] = 18 "A simple five-level FIFO queue sched_ext scheduler.\n" 19 "\n" 20 "See the top-level comment in .bpf.c for more details.\n" 21 "\n" 22 "Usage: %s [-s SLICE_US] [-e COUNT] [-t COUNT] [-T COUNT] [-l COUNT] [-b COUNT]\n" 23 " [-P] [-M] [-d PID] [-D LEN] [-p] [-v]\n" 24 "\n" 25 " -s SLICE_US Override slice duration\n" 26 " -e COUNT Trigger scx_bpf_error() after COUNT enqueues\n" 27 " -t COUNT Stall every COUNT'th user thread\n" 28 " -T COUNT Stall every COUNT'th kernel thread\n" 29 " -l COUNT Trigger dispatch infinite looping after COUNT dispatches\n" 30 " -b COUNT Dispatch upto COUNT tasks together\n" 31 " -P Print out DSQ content and event counters to trace_pipe every second\n" 32 " -M Print out debug messages to trace_pipe\n" 33 " -H Boost nice -20 tasks in SHARED_DSQ, use with -b\n" 34 " -d PID Disallow a process from switching into SCHED_EXT (-1 for self)\n" 35 " -D LEN Set scx_exit_info.dump buffer length\n" 36 " -S Suppress qmap-specific debug dump\n" 37 " -p Switch only tasks on SCHED_EXT policy instead of all\n" 38 " -v Print libbpf debug messages\n" 39 " -h Display this help and exit\n"; 40 41 static bool verbose; 42 static volatile int exit_req; 43 44 static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args) 45 { 46 if (level == LIBBPF_DEBUG && !verbose) 47 return 0; 48 return vfprintf(stderr, format, args); 49 } 50 51 static void sigint_handler(int dummy) 52 { 53 exit_req = 1; 54 } 55 56 int main(int argc, char **argv) 57 { 58 struct scx_qmap *skel; 59 struct bpf_link *link; 60 int opt; 61 62 libbpf_set_print(libbpf_print_fn); 63 signal(SIGINT, sigint_handler); 64 signal(SIGTERM, sigint_handler); 65 66 skel = SCX_OPS_OPEN(qmap_ops, scx_qmap); 67 68 skel->rodata->slice_ns = __COMPAT_ENUM_OR_ZERO("scx_public_consts", "SCX_SLICE_DFL"); 69 70 while ((opt = getopt(argc, argv, "s:e:t:T:l:b:PMHd:D:Spvh")) != -1) { 71 switch (opt) { 72 case 's': 73 skel->rodata->slice_ns = strtoull(optarg, NULL, 0) * 1000; 74 break; 75 case 'e': 76 skel->bss->test_error_cnt = strtoul(optarg, NULL, 0); 77 break; 78 case 't': 79 skel->rodata->stall_user_nth = strtoul(optarg, NULL, 0); 80 break; 81 case 'T': 82 skel->rodata->stall_kernel_nth = strtoul(optarg, NULL, 0); 83 break; 84 case 'l': 85 skel->rodata->dsp_inf_loop_after = strtoul(optarg, NULL, 0); 86 break; 87 case 'b': 88 skel->rodata->dsp_batch = strtoul(optarg, NULL, 0); 89 break; 90 case 'P': 91 skel->rodata->print_dsqs_and_events = true; 92 break; 93 case 'M': 94 skel->rodata->print_msgs = true; 95 break; 96 case 'H': 97 skel->rodata->highpri_boosting = true; 98 break; 99 case 'd': 100 skel->rodata->disallow_tgid = strtol(optarg, NULL, 0); 101 if (skel->rodata->disallow_tgid < 0) 102 skel->rodata->disallow_tgid = getpid(); 103 break; 104 case 'D': 105 skel->struct_ops.qmap_ops->exit_dump_len = strtoul(optarg, NULL, 0); 106 break; 107 case 'S': 108 skel->rodata->suppress_dump = true; 109 break; 110 case 'p': 111 skel->struct_ops.qmap_ops->flags |= SCX_OPS_SWITCH_PARTIAL; 112 break; 113 case 'v': 114 verbose = true; 115 break; 116 default: 117 fprintf(stderr, help_fmt, basename(argv[0])); 118 return opt != 'h'; 119 } 120 } 121 122 SCX_OPS_LOAD(skel, qmap_ops, scx_qmap, uei); 123 link = SCX_OPS_ATTACH(skel, qmap_ops, scx_qmap); 124 125 while (!exit_req && !UEI_EXITED(skel, uei)) { 126 long nr_enqueued = skel->bss->nr_enqueued; 127 long nr_dispatched = skel->bss->nr_dispatched; 128 129 printf("stats : enq=%lu dsp=%lu delta=%ld reenq=%"PRIu64" deq=%"PRIu64" core=%"PRIu64" enq_ddsp=%"PRIu64"\n", 130 nr_enqueued, nr_dispatched, nr_enqueued - nr_dispatched, 131 skel->bss->nr_reenqueued, skel->bss->nr_dequeued, 132 skel->bss->nr_core_sched_execed, 133 skel->bss->nr_ddsp_from_enq); 134 printf(" exp_local=%"PRIu64" exp_remote=%"PRIu64" exp_timer=%"PRIu64" exp_lost=%"PRIu64"\n", 135 skel->bss->nr_expedited_local, 136 skel->bss->nr_expedited_remote, 137 skel->bss->nr_expedited_from_timer, 138 skel->bss->nr_expedited_lost); 139 if (__COMPAT_has_ksym("scx_bpf_cpuperf_cur")) 140 printf("cpuperf: cur min/avg/max=%u/%u/%u target min/avg/max=%u/%u/%u\n", 141 skel->bss->cpuperf_min, 142 skel->bss->cpuperf_avg, 143 skel->bss->cpuperf_max, 144 skel->bss->cpuperf_target_min, 145 skel->bss->cpuperf_target_avg, 146 skel->bss->cpuperf_target_max); 147 fflush(stdout); 148 sleep(1); 149 } 150 151 bpf_link__destroy(link); 152 UEI_REPORT(skel, uei); 153 scx_qmap__destroy(skel); 154 /* 155 * scx_qmap implements ops.cpu_on/offline() and doesn't need to restart 156 * on CPU hotplug events. 157 */ 158 return 0; 159 } 160