1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * Copyright (c) 2022 Meta Platforms, Inc. and 3 * Copyright (c) 2022 Meta Platforms, Inc. and affiliates.
4 * Copyright (c) 2022 Tejun Heo <tj@kernel.org 4 * Copyright (c) 2022 Tejun Heo <tj@kernel.org>
5 * Copyright (c) 2022 David Vernet <dvernet@me 5 * Copyright (c) 2022 David Vernet <dvernet@meta.com>
6 */ 6 */
7 #include <stdio.h> 7 #include <stdio.h>
8 #include <unistd.h> 8 #include <unistd.h>
9 #include <signal.h> 9 #include <signal.h>
10 #include <libgen.h> 10 #include <libgen.h>
11 #include <bpf/bpf.h> 11 #include <bpf/bpf.h>
12 #include <scx/common.h> 12 #include <scx/common.h>
13 #include "scx_simple.bpf.skel.h" 13 #include "scx_simple.bpf.skel.h"
14 14
15 const char help_fmt[] = 15 const char help_fmt[] =
16 "A simple sched_ext scheduler.\n" 16 "A simple sched_ext scheduler.\n"
17 "\n" 17 "\n"
18 "See the top-level comment in .bpf.c for more 18 "See the top-level comment in .bpf.c for more details.\n"
19 "\n" 19 "\n"
20 "Usage: %s [-f] [-v]\n" 20 "Usage: %s [-f] [-v]\n"
21 "\n" 21 "\n"
22 " -f Use FIFO scheduling instead o 22 " -f Use FIFO scheduling instead of weighted vtime scheduling\n"
23 " -v Print libbpf debug messages\n 23 " -v Print libbpf debug messages\n"
24 " -h Display this help and exit\n" 24 " -h Display this help and exit\n";
25 25
26 static bool verbose; 26 static bool verbose;
27 static volatile int exit_req; 27 static volatile int exit_req;
28 28
29 static int libbpf_print_fn(enum libbpf_print_l 29 static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
30 { 30 {
31 if (level == LIBBPF_DEBUG && !verbose) 31 if (level == LIBBPF_DEBUG && !verbose)
32 return 0; 32 return 0;
33 return vfprintf(stderr, format, args); 33 return vfprintf(stderr, format, args);
34 } 34 }
35 35
36 static void sigint_handler(int simple) 36 static void sigint_handler(int simple)
37 { 37 {
38 exit_req = 1; 38 exit_req = 1;
39 } 39 }
40 40
41 static void read_stats(struct scx_simple *skel 41 static void read_stats(struct scx_simple *skel, __u64 *stats)
42 { 42 {
43 int nr_cpus = libbpf_num_possible_cpus 43 int nr_cpus = libbpf_num_possible_cpus();
44 __u64 cnts[2][nr_cpus]; 44 __u64 cnts[2][nr_cpus];
45 __u32 idx; 45 __u32 idx;
46 46
47 memset(stats, 0, sizeof(stats[0]) * 2) 47 memset(stats, 0, sizeof(stats[0]) * 2);
48 48
49 for (idx = 0; idx < 2; idx++) { 49 for (idx = 0; idx < 2; idx++) {
50 int ret, cpu; 50 int ret, cpu;
51 51
52 ret = bpf_map_lookup_elem(bpf_ 52 ret = bpf_map_lookup_elem(bpf_map__fd(skel->maps.stats),
53 &idx 53 &idx, cnts[idx]);
54 if (ret < 0) 54 if (ret < 0)
55 continue; 55 continue;
56 for (cpu = 0; cpu < nr_cpus; c 56 for (cpu = 0; cpu < nr_cpus; cpu++)
57 stats[idx] += cnts[idx 57 stats[idx] += cnts[idx][cpu];
58 } 58 }
59 } 59 }
60 60
61 int main(int argc, char **argv) 61 int main(int argc, char **argv)
62 { 62 {
63 struct scx_simple *skel; 63 struct scx_simple *skel;
64 struct bpf_link *link; 64 struct bpf_link *link;
65 __u32 opt; 65 __u32 opt;
66 __u64 ecode; 66 __u64 ecode;
67 67
68 libbpf_set_print(libbpf_print_fn); 68 libbpf_set_print(libbpf_print_fn);
69 signal(SIGINT, sigint_handler); 69 signal(SIGINT, sigint_handler);
70 signal(SIGTERM, sigint_handler); 70 signal(SIGTERM, sigint_handler);
71 restart: 71 restart:
72 skel = SCX_OPS_OPEN(simple_ops, scx_si 72 skel = SCX_OPS_OPEN(simple_ops, scx_simple);
73 73
74 while ((opt = getopt(argc, argv, "fvh" 74 while ((opt = getopt(argc, argv, "fvh")) != -1) {
75 switch (opt) { 75 switch (opt) {
76 case 'f': 76 case 'f':
77 skel->rodata->fifo_sch 77 skel->rodata->fifo_sched = true;
78 break; 78 break;
79 case 'v': 79 case 'v':
80 verbose = true; 80 verbose = true;
81 break; 81 break;
82 default: 82 default:
83 fprintf(stderr, help_f 83 fprintf(stderr, help_fmt, basename(argv[0]));
84 return opt != 'h'; 84 return opt != 'h';
85 } 85 }
86 } 86 }
87 87
88 SCX_OPS_LOAD(skel, simple_ops, scx_sim 88 SCX_OPS_LOAD(skel, simple_ops, scx_simple, uei);
89 link = SCX_OPS_ATTACH(skel, simple_ops 89 link = SCX_OPS_ATTACH(skel, simple_ops, scx_simple);
90 90
91 while (!exit_req && !UEI_EXITED(skel, 91 while (!exit_req && !UEI_EXITED(skel, uei)) {
92 __u64 stats[2]; 92 __u64 stats[2];
93 93
94 read_stats(skel, stats); 94 read_stats(skel, stats);
95 printf("local=%llu global=%llu 95 printf("local=%llu global=%llu\n", stats[0], stats[1]);
96 fflush(stdout); 96 fflush(stdout);
97 sleep(1); 97 sleep(1);
98 } 98 }
99 99
100 bpf_link__destroy(link); 100 bpf_link__destroy(link);
101 ecode = UEI_REPORT(skel, uei); 101 ecode = UEI_REPORT(skel, uei);
102 scx_simple__destroy(skel); 102 scx_simple__destroy(skel);
103 103
104 if (UEI_ECODE_RESTART(ecode)) 104 if (UEI_ECODE_RESTART(ecode))
105 goto restart; 105 goto restart;
106 return 0; 106 return 0;
107 } 107 }
108 108
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