1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2022 Meta Platforms, Inc. and affiliates.
* Copyright (c) 2022 Tejun Heo <tj@kernel.org>
* Copyright (c) 2022 David Vernet <dvernet@meta.com>
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <inttypes.h>
#include <signal.h>
#include <assert.h>
#include <libgen.h>
#include <bpf/bpf.h>
#include <scx/common.h>
#include "scx_central.bpf.skel.h"
const char help_fmt[] =
"A central FIFO sched_ext scheduler.\n"
"\n"
"See the top-level comment in .bpf.c for more details.\n"
"\n"
"Usage: %s [-s SLICE_US] [-c CPU] [-v]\n"
"\n"
" -s SLICE_US Override slice duration\n"
" -c CPU Override the central CPU (default: 0)\n"
" -v Print libbpf debug messages\n"
" -h Display this help and exit\n";
static bool verbose;
static volatile int exit_req;
static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
{
if (level == LIBBPF_DEBUG && !verbose)
return 0;
return vfprintf(stderr, format, args);
}
static void sigint_handler(int dummy)
{
exit_req = 1;
}
int main(int argc, char **argv)
{
struct scx_central *skel;
struct bpf_link *link;
__u64 seq = 0, ecode;
__s32 opt;
libbpf_set_print(libbpf_print_fn);
signal(SIGINT, sigint_handler);
signal(SIGTERM, sigint_handler);
restart:
optind = 1;
skel = SCX_OPS_OPEN(central_ops, scx_central);
skel->rodata->central_cpu = 0;
skel->rodata->nr_cpu_ids = libbpf_num_possible_cpus();
skel->rodata->slice_ns = __COMPAT_ENUM_OR_ZERO("scx_public_consts", "SCX_SLICE_DFL");
assert(skel->rodata->nr_cpu_ids > 0);
assert(skel->rodata->nr_cpu_ids <= INT32_MAX);
while ((opt = getopt(argc, argv, "s:c:vh")) != -1) {
switch (opt) {
case 's':
skel->rodata->slice_ns = strtoull(optarg, NULL, 0) * 1000;
break;
case 'c': {
u32 central_cpu = strtoul(optarg, NULL, 0);
if (central_cpu >= skel->rodata->nr_cpu_ids) {
fprintf(stderr, "invalid central CPU id value, %u given (%u max)\n", central_cpu, skel->rodata->nr_cpu_ids);
scx_central__destroy(skel);
return -1;
}
skel->rodata->central_cpu = (s32)central_cpu;
break;
}
case 'v':
verbose = true;
break;
default:
fprintf(stderr, help_fmt, basename(argv[0]));
return opt != 'h';
}
}
/* Resize arrays so their element count is equal to cpu count. */
RESIZE_ARRAY(skel, data, cpu_gimme_task, skel->rodata->nr_cpu_ids);
RESIZE_ARRAY(skel, data, cpu_started_at, skel->rodata->nr_cpu_ids);
SCX_OPS_LOAD(skel, central_ops, scx_central, uei);
link = SCX_OPS_ATTACH(skel, central_ops, scx_central);
if (!skel->data->timer_pinned)
printf("WARNING : BPF_F_TIMER_CPU_PIN not available, timer not pinned to central\n");
while (!exit_req && !UEI_EXITED(skel, uei)) {
printf("[SEQ %llu]\n", seq++);
printf("total :%10" PRIu64 " local:%10" PRIu64 " queued:%10" PRIu64 " lost:%10" PRIu64 "\n",
skel->bss->nr_total,
skel->bss->nr_locals,
skel->bss->nr_queued,
skel->bss->nr_lost_pids);
printf("timer :%10" PRIu64 " dispatch:%10" PRIu64 " mismatch:%10" PRIu64 " retry:%10" PRIu64 "\n",
skel->bss->nr_timers,
skel->bss->nr_dispatches,
skel->bss->nr_mismatches,
skel->bss->nr_retries);
printf("overflow:%10" PRIu64 "\n",
skel->bss->nr_overflows);
fflush(stdout);
sleep(1);
}
bpf_link__destroy(link);
ecode = UEI_REPORT(skel, uei);
scx_central__destroy(skel);
if (UEI_ECODE_RESTART(ecode))
goto restart;
return 0;
}
|
