1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020 Facebook */
3 #include "bench.h"
4 #include "trigger_bench.skel.h"
5 #include "trace_helpers.h"
6 
7 /* BPF triggering benchmarks */
8 static struct trigger_ctx {
9 	struct trigger_bench *skel;
10 } ctx;
11 
12 static struct counter base_hits;
13 
14 static void trigger_validate(void)
15 {
16 	if (env.consumer_cnt != 1) {
17 		fprintf(stderr, "benchmark doesn't support multi-consumer!\n");
18 		exit(1);
19 	}
20 }
21 
22 static void *trigger_base_producer(void *input)
23 {
24 	while (true) {
25 		(void)syscall(__NR_getpgid);
26 		atomic_inc(&base_hits.value);
27 	}
28 	return NULL;
29 }
30 
31 static void trigger_base_measure(struct bench_res *res)
32 {
33 	res->hits = atomic_swap(&base_hits.value, 0);
34 }
35 
36 static void *trigger_producer(void *input)
37 {
38 	while (true)
39 		(void)syscall(__NR_getpgid);
40 	return NULL;
41 }
42 
43 static void trigger_measure(struct bench_res *res)
44 {
45 	res->hits = atomic_swap(&ctx.skel->bss->hits, 0);
46 }
47 
48 static void setup_ctx(void)
49 {
50 	setup_libbpf();
51 
52 	ctx.skel = trigger_bench__open_and_load();
53 	if (!ctx.skel) {
54 		fprintf(stderr, "failed to open skeleton\n");
55 		exit(1);
56 	}
57 }
58 
59 static void attach_bpf(struct bpf_program *prog)
60 {
61 	struct bpf_link *link;
62 
63 	link = bpf_program__attach(prog);
64 	if (!link) {
65 		fprintf(stderr, "failed to attach program!\n");
66 		exit(1);
67 	}
68 }
69 
70 static void trigger_tp_setup(void)
71 {
72 	setup_ctx();
73 	attach_bpf(ctx.skel->progs.bench_trigger_tp);
74 }
75 
76 static void trigger_rawtp_setup(void)
77 {
78 	setup_ctx();
79 	attach_bpf(ctx.skel->progs.bench_trigger_raw_tp);
80 }
81 
82 static void trigger_kprobe_setup(void)
83 {
84 	setup_ctx();
85 	attach_bpf(ctx.skel->progs.bench_trigger_kprobe);
86 }
87 
88 static void trigger_fentry_setup(void)
89 {
90 	setup_ctx();
91 	attach_bpf(ctx.skel->progs.bench_trigger_fentry);
92 }
93 
94 static void trigger_fentry_sleep_setup(void)
95 {
96 	setup_ctx();
97 	attach_bpf(ctx.skel->progs.bench_trigger_fentry_sleep);
98 }
99 
100 static void trigger_fmodret_setup(void)
101 {
102 	setup_ctx();
103 	attach_bpf(ctx.skel->progs.bench_trigger_fmodret);
104 }
105 
106 static void *trigger_consumer(void *input)
107 {
108 	return NULL;
109 }
110 
111 /* make sure call is not inlined and not avoided by compiler, so __weak and
112  * inline asm volatile in the body of the function
113  *
114  * There is a performance difference between uprobing at nop location vs other
115  * instructions. So use two different targets, one of which starts with nop
116  * and another doesn't.
117  *
118  * GCC doesn't generate stack setup preample for these functions due to them
119  * having no input arguments and doing nothing in the body.
120  */
121 __weak void uprobe_target_with_nop(void)
122 {
123 	asm volatile ("nop");
124 }
125 
126 __weak void uprobe_target_without_nop(void)
127 {
128 	asm volatile ("");
129 }
130 
131 static void *uprobe_base_producer(void *input)
132 {
133 	while (true) {
134 		uprobe_target_with_nop();
135 		atomic_inc(&base_hits.value);
136 	}
137 	return NULL;
138 }
139 
140 static void *uprobe_producer_with_nop(void *input)
141 {
142 	while (true)
143 		uprobe_target_with_nop();
144 	return NULL;
145 }
146 
147 static void *uprobe_producer_without_nop(void *input)
148 {
149 	while (true)
150 		uprobe_target_without_nop();
151 	return NULL;
152 }
153 
154 static void usetup(bool use_retprobe, bool use_nop)
155 {
156 	size_t uprobe_offset;
157 	struct bpf_link *link;
158 
159 	setup_libbpf();
160 
161 	ctx.skel = trigger_bench__open_and_load();
162 	if (!ctx.skel) {
163 		fprintf(stderr, "failed to open skeleton\n");
164 		exit(1);
165 	}
166 
167 	if (use_nop)
168 		uprobe_offset = get_uprobe_offset(&uprobe_target_with_nop);
169 	else
170 		uprobe_offset = get_uprobe_offset(&uprobe_target_without_nop);
171 
172 	link = bpf_program__attach_uprobe(ctx.skel->progs.bench_trigger_uprobe,
173 					  use_retprobe,
174 					  -1 /* all PIDs */,
175 					  "/proc/self/exe",
176 					  uprobe_offset);
177 	if (!link) {
178 		fprintf(stderr, "failed to attach uprobe!\n");
179 		exit(1);
180 	}
181 	ctx.skel->links.bench_trigger_uprobe = link;
182 }
183 
184 static void uprobe_setup_with_nop(void)
185 {
186 	usetup(false, true);
187 }
188 
189 static void uretprobe_setup_with_nop(void)
190 {
191 	usetup(true, true);
192 }
193 
194 static void uprobe_setup_without_nop(void)
195 {
196 	usetup(false, false);
197 }
198 
199 static void uretprobe_setup_without_nop(void)
200 {
201 	usetup(true, false);
202 }
203 
204 const struct bench bench_trig_base = {
205 	.name = "trig-base",
206 	.validate = trigger_validate,
207 	.producer_thread = trigger_base_producer,
208 	.consumer_thread = trigger_consumer,
209 	.measure = trigger_base_measure,
210 	.report_progress = hits_drops_report_progress,
211 	.report_final = hits_drops_report_final,
212 };
213 
214 const struct bench bench_trig_tp = {
215 	.name = "trig-tp",
216 	.validate = trigger_validate,
217 	.setup = trigger_tp_setup,
218 	.producer_thread = trigger_producer,
219 	.consumer_thread = trigger_consumer,
220 	.measure = trigger_measure,
221 	.report_progress = hits_drops_report_progress,
222 	.report_final = hits_drops_report_final,
223 };
224 
225 const struct bench bench_trig_rawtp = {
226 	.name = "trig-rawtp",
227 	.validate = trigger_validate,
228 	.setup = trigger_rawtp_setup,
229 	.producer_thread = trigger_producer,
230 	.consumer_thread = trigger_consumer,
231 	.measure = trigger_measure,
232 	.report_progress = hits_drops_report_progress,
233 	.report_final = hits_drops_report_final,
234 };
235 
236 const struct bench bench_trig_kprobe = {
237 	.name = "trig-kprobe",
238 	.validate = trigger_validate,
239 	.setup = trigger_kprobe_setup,
240 	.producer_thread = trigger_producer,
241 	.consumer_thread = trigger_consumer,
242 	.measure = trigger_measure,
243 	.report_progress = hits_drops_report_progress,
244 	.report_final = hits_drops_report_final,
245 };
246 
247 const struct bench bench_trig_fentry = {
248 	.name = "trig-fentry",
249 	.validate = trigger_validate,
250 	.setup = trigger_fentry_setup,
251 	.producer_thread = trigger_producer,
252 	.consumer_thread = trigger_consumer,
253 	.measure = trigger_measure,
254 	.report_progress = hits_drops_report_progress,
255 	.report_final = hits_drops_report_final,
256 };
257 
258 const struct bench bench_trig_fentry_sleep = {
259 	.name = "trig-fentry-sleep",
260 	.validate = trigger_validate,
261 	.setup = trigger_fentry_sleep_setup,
262 	.producer_thread = trigger_producer,
263 	.consumer_thread = trigger_consumer,
264 	.measure = trigger_measure,
265 	.report_progress = hits_drops_report_progress,
266 	.report_final = hits_drops_report_final,
267 };
268 
269 const struct bench bench_trig_fmodret = {
270 	.name = "trig-fmodret",
271 	.validate = trigger_validate,
272 	.setup = trigger_fmodret_setup,
273 	.producer_thread = trigger_producer,
274 	.consumer_thread = trigger_consumer,
275 	.measure = trigger_measure,
276 	.report_progress = hits_drops_report_progress,
277 	.report_final = hits_drops_report_final,
278 };
279 
280 const struct bench bench_trig_uprobe_base = {
281 	.name = "trig-uprobe-base",
282 	.setup = NULL, /* no uprobe/uretprobe is attached */
283 	.producer_thread = uprobe_base_producer,
284 	.consumer_thread = trigger_consumer,
285 	.measure = trigger_base_measure,
286 	.report_progress = hits_drops_report_progress,
287 	.report_final = hits_drops_report_final,
288 };
289 
290 const struct bench bench_trig_uprobe_with_nop = {
291 	.name = "trig-uprobe-with-nop",
292 	.setup = uprobe_setup_with_nop,
293 	.producer_thread = uprobe_producer_with_nop,
294 	.consumer_thread = trigger_consumer,
295 	.measure = trigger_measure,
296 	.report_progress = hits_drops_report_progress,
297 	.report_final = hits_drops_report_final,
298 };
299 
300 const struct bench bench_trig_uretprobe_with_nop = {
301 	.name = "trig-uretprobe-with-nop",
302 	.setup = uretprobe_setup_with_nop,
303 	.producer_thread = uprobe_producer_with_nop,
304 	.consumer_thread = trigger_consumer,
305 	.measure = trigger_measure,
306 	.report_progress = hits_drops_report_progress,
307 	.report_final = hits_drops_report_final,
308 };
309 
310 const struct bench bench_trig_uprobe_without_nop = {
311 	.name = "trig-uprobe-without-nop",
312 	.setup = uprobe_setup_without_nop,
313 	.producer_thread = uprobe_producer_without_nop,
314 	.consumer_thread = trigger_consumer,
315 	.measure = trigger_measure,
316 	.report_progress = hits_drops_report_progress,
317 	.report_final = hits_drops_report_final,
318 };
319 
320 const struct bench bench_trig_uretprobe_without_nop = {
321 	.name = "trig-uretprobe-without-nop",
322 	.setup = uretprobe_setup_without_nop,
323 	.producer_thread = uprobe_producer_without_nop,
324 	.consumer_thread = trigger_consumer,
325 	.measure = trigger_measure,
326 	.report_progress = hits_drops_report_progress,
327 	.report_final = hits_drops_report_final,
328 };
329