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9#include "debug.h"
10#include "../perf.h"
11#include "../util/util.h"
12#include <subcmd/parse-options.h>
13#include "../util/header.h"
14#include "../util/cloexec.h"
15#include "bench.h"
16#include "mem-memcpy-arch.h"
17#include "mem-memset-arch.h"
18
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
22#include <sys/time.h>
23#include <errno.h>
24#include <linux/time64.h>
25
26#define K 1024
27
28static const char *size_str = "1MB";
29static const char *function_str = "all";
30static int nr_loops = 1;
31static bool use_cycles;
32static int cycles_fd;
33
34static const struct option options[] = {
35 OPT_STRING('s', "size", &size_str, "1MB",
36 "Specify the size of the memory buffers. "
37 "Available units: B, KB, MB, GB and TB (case insensitive)"),
38
39 OPT_STRING('f', "function", &function_str, "all",
40 "Specify the function to run, \"all\" runs all available functions, \"help\" lists them"),
41
42 OPT_INTEGER('l', "nr_loops", &nr_loops,
43 "Specify the number of loops to run. (default: 1)"),
44
45 OPT_BOOLEAN('c', "cycles", &use_cycles,
46 "Use a cycles event instead of gettimeofday() to measure performance"),
47
48 OPT_END()
49};
50
51typedef void *(*memcpy_t)(void *, const void *, size_t);
52typedef void *(*memset_t)(void *, int, size_t);
53
54struct function {
55 const char *name;
56 const char *desc;
57 union {
58 memcpy_t memcpy;
59 memset_t memset;
60 } fn;
61};
62
63static struct perf_event_attr cycle_attr = {
64 .type = PERF_TYPE_HARDWARE,
65 .config = PERF_COUNT_HW_CPU_CYCLES
66};
67
68static int init_cycles(void)
69{
70 cycles_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1, perf_event_open_cloexec_flag());
71
72 if (cycles_fd < 0 && errno == ENOSYS) {
73 pr_debug("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
74 return -1;
75 }
76
77 return cycles_fd;
78}
79
80static u64 get_cycles(void)
81{
82 int ret;
83 u64 clk;
84
85 ret = read(cycles_fd, &clk, sizeof(u64));
86 BUG_ON(ret != sizeof(u64));
87
88 return clk;
89}
90
91static double timeval2double(struct timeval *ts)
92{
93 return (double)ts->tv_sec + (double)ts->tv_usec / (double)USEC_PER_SEC;
94}
95
96#define print_bps(x) do { \
97 if (x < K) \
98 printf(" %14lf bytes/sec\n", x); \
99 else if (x < K * K) \
100 printf(" %14lfd KB/sec\n", x / K); \
101 else if (x < K * K * K) \
102 printf(" %14lf MB/sec\n", x / K / K); \
103 else \
104 printf(" %14lf GB/sec\n", x / K / K / K); \
105 } while (0)
106
107struct bench_mem_info {
108 const struct function *functions;
109 u64 (*do_cycles)(const struct function *r, size_t size, void *src, void *dst);
110 double (*do_gettimeofday)(const struct function *r, size_t size, void *src, void *dst);
111 const char *const *usage;
112 bool alloc_src;
113};
114
115static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t size, double size_total)
116{
117 const struct function *r = &info->functions[r_idx];
118 double result_bps = 0.0;
119 u64 result_cycles = 0;
120 void *src = NULL, *dst = zalloc(size);
121
122 printf("# function '%s' (%s)\n", r->name, r->desc);
123
124 if (dst == NULL)
125 goto out_alloc_failed;
126
127 if (info->alloc_src) {
128 src = zalloc(size);
129 if (src == NULL)
130 goto out_alloc_failed;
131 }
132
133 if (bench_format == BENCH_FORMAT_DEFAULT)
134 printf("# Copying %s bytes ...\n\n", size_str);
135
136 if (use_cycles) {
137 result_cycles = info->do_cycles(r, size, src, dst);
138 } else {
139 result_bps = info->do_gettimeofday(r, size, src, dst);
140 }
141
142 switch (bench_format) {
143 case BENCH_FORMAT_DEFAULT:
144 if (use_cycles) {
145 printf(" %14lf cycles/byte\n", (double)result_cycles/size_total);
146 } else {
147 print_bps(result_bps);
148 }
149 break;
150
151 case BENCH_FORMAT_SIMPLE:
152 if (use_cycles) {
153 printf("%lf\n", (double)result_cycles/size_total);
154 } else {
155 printf("%lf\n", result_bps);
156 }
157 break;
158
159 default:
160 BUG_ON(1);
161 break;
162 }
163
164out_free:
165 free(src);
166 free(dst);
167 return;
168out_alloc_failed:
169 printf("# Memory allocation failed - maybe size (%s) is too large?\n", size_str);
170 goto out_free;
171}
172
173static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *info)
174{
175 int i;
176 size_t size;
177 double size_total;
178
179 argc = parse_options(argc, argv, options, info->usage, 0);
180
181 if (use_cycles) {
182 i = init_cycles();
183 if (i < 0) {
184 fprintf(stderr, "Failed to open cycles counter\n");
185 return i;
186 }
187 }
188
189 size = (size_t)perf_atoll((char *)size_str);
190 size_total = (double)size * nr_loops;
191
192 if ((s64)size <= 0) {
193 fprintf(stderr, "Invalid size:%s\n", size_str);
194 return 1;
195 }
196
197 if (!strncmp(function_str, "all", 3)) {
198 for (i = 0; info->functions[i].name; i++)
199 __bench_mem_function(info, i, size, size_total);
200 return 0;
201 }
202
203 for (i = 0; info->functions[i].name; i++) {
204 if (!strcmp(info->functions[i].name, function_str))
205 break;
206 }
207 if (!info->functions[i].name) {
208 if (strcmp(function_str, "help") && strcmp(function_str, "h"))
209 printf("Unknown function: %s\n", function_str);
210 printf("Available functions:\n");
211 for (i = 0; info->functions[i].name; i++) {
212 printf("\t%s ... %s\n",
213 info->functions[i].name, info->functions[i].desc);
214 }
215 return 1;
216 }
217
218 __bench_mem_function(info, i, size, size_total);
219
220 return 0;
221}
222
223static u64 do_memcpy_cycles(const struct function *r, size_t size, void *src, void *dst)
224{
225 u64 cycle_start = 0ULL, cycle_end = 0ULL;
226 memcpy_t fn = r->fn.memcpy;
227 int i;
228
229
230 memset(src, 0, size);
231
232
233
234
235
236 fn(dst, src, size);
237
238 cycle_start = get_cycles();
239 for (i = 0; i < nr_loops; ++i)
240 fn(dst, src, size);
241 cycle_end = get_cycles();
242
243 return cycle_end - cycle_start;
244}
245
246static double do_memcpy_gettimeofday(const struct function *r, size_t size, void *src, void *dst)
247{
248 struct timeval tv_start, tv_end, tv_diff;
249 memcpy_t fn = r->fn.memcpy;
250 int i;
251
252
253
254
255
256 fn(dst, src, size);
257
258 BUG_ON(gettimeofday(&tv_start, NULL));
259 for (i = 0; i < nr_loops; ++i)
260 fn(dst, src, size);
261 BUG_ON(gettimeofday(&tv_end, NULL));
262
263 timersub(&tv_end, &tv_start, &tv_diff);
264
265 return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
266}
267
268struct function memcpy_functions[] = {
269 { .name = "default",
270 .desc = "Default memcpy() provided by glibc",
271 .fn.memcpy = memcpy },
272
273#ifdef HAVE_ARCH_X86_64_SUPPORT
274# define MEMCPY_FN(_fn, _name, _desc) {.name = _name, .desc = _desc, .fn.memcpy = _fn},
275# include "mem-memcpy-x86-64-asm-def.h"
276# undef MEMCPY_FN
277#endif
278
279 { .name = NULL, }
280};
281
282static const char * const bench_mem_memcpy_usage[] = {
283 "perf bench mem memcpy <options>",
284 NULL
285};
286
287int bench_mem_memcpy(int argc, const char **argv, const char *prefix __maybe_unused)
288{
289 struct bench_mem_info info = {
290 .functions = memcpy_functions,
291 .do_cycles = do_memcpy_cycles,
292 .do_gettimeofday = do_memcpy_gettimeofday,
293 .usage = bench_mem_memcpy_usage,
294 .alloc_src = true,
295 };
296
297 return bench_mem_common(argc, argv, &info);
298}
299
300static u64 do_memset_cycles(const struct function *r, size_t size, void *src __maybe_unused, void *dst)
301{
302 u64 cycle_start = 0ULL, cycle_end = 0ULL;
303 memset_t fn = r->fn.memset;
304 int i;
305
306
307
308
309
310 fn(dst, -1, size);
311
312 cycle_start = get_cycles();
313 for (i = 0; i < nr_loops; ++i)
314 fn(dst, i, size);
315 cycle_end = get_cycles();
316
317 return cycle_end - cycle_start;
318}
319
320static double do_memset_gettimeofday(const struct function *r, size_t size, void *src __maybe_unused, void *dst)
321{
322 struct timeval tv_start, tv_end, tv_diff;
323 memset_t fn = r->fn.memset;
324 int i;
325
326
327
328
329
330 fn(dst, -1, size);
331
332 BUG_ON(gettimeofday(&tv_start, NULL));
333 for (i = 0; i < nr_loops; ++i)
334 fn(dst, i, size);
335 BUG_ON(gettimeofday(&tv_end, NULL));
336
337 timersub(&tv_end, &tv_start, &tv_diff);
338
339 return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
340}
341
342static const char * const bench_mem_memset_usage[] = {
343 "perf bench mem memset <options>",
344 NULL
345};
346
347static const struct function memset_functions[] = {
348 { .name = "default",
349 .desc = "Default memset() provided by glibc",
350 .fn.memset = memset },
351
352#ifdef HAVE_ARCH_X86_64_SUPPORT
353# define MEMSET_FN(_fn, _name, _desc) { .name = _name, .desc = _desc, .fn.memset = _fn },
354# include "mem-memset-x86-64-asm-def.h"
355# undef MEMSET_FN
356#endif
357
358 { .name = NULL, }
359};
360
361int bench_mem_memset(int argc, const char **argv, const char *prefix __maybe_unused)
362{
363 struct bench_mem_info info = {
364 .functions = memset_functions,
365 .do_cycles = do_memset_cycles,
366 .do_gettimeofday = do_memset_gettimeofday,
367 .usage = bench_mem_memset_usage,
368 };
369
370 return bench_mem_common(argc, argv, &info);
371}
372
