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8#include <ctype.h>
9
10#include "../perf.h"
11#include "../util/util.h"
12#include "../util/parse-options.h"
13#include "../util/header.h"
14#include "bench.h"
15#include "mem-memcpy-arch.h"
16
17#include <stdio.h>
18#include <stdlib.h>
19#include <string.h>
20#include <sys/time.h>
21#include <errno.h>
22
23#define K 1024
24
25static const char *length_str = "1MB";
26static const char *routine = "default";
27static bool use_clock;
28static int clock_fd;
29static bool only_prefault;
30static bool no_prefault;
31
32static const struct option options[] = {
33 OPT_STRING('l', "length", &length_str, "1MB",
34 "Specify length of memory to copy. "
35 "available unit: B, MB, GB (upper and lower)"),
36 OPT_STRING('r', "routine", &routine, "default",
37 "Specify routine to copy"),
38 OPT_BOOLEAN('c', "clock", &use_clock,
39 "Use CPU clock for measuring"),
40 OPT_BOOLEAN('o', "only-prefault", &only_prefault,
41 "Show only the result with page faults before memcpy()"),
42 OPT_BOOLEAN('n', "no-prefault", &no_prefault,
43 "Show only the result without page faults before memcpy()"),
44 OPT_END()
45};
46
47typedef void *(*memcpy_t)(void *, const void *, size_t);
48
49struct routine {
50 const char *name;
51 const char *desc;
52 memcpy_t fn;
53};
54
55struct routine routines[] = {
56 { "default",
57 "Default memcpy() provided by glibc",
58 memcpy },
59#ifdef ARCH_X86_64
60
61#define MEMCPY_FN(fn, name, desc) { name, desc, fn },
62#include "mem-memcpy-x86-64-asm-def.h"
63#undef MEMCPY_FN
64
65#endif
66
67 { NULL,
68 NULL,
69 NULL }
70};
71
72static const char * const bench_mem_memcpy_usage[] = {
73 "perf bench mem memcpy <options>",
74 NULL
75};
76
77static struct perf_event_attr clock_attr = {
78 .type = PERF_TYPE_HARDWARE,
79 .config = PERF_COUNT_HW_CPU_CYCLES
80};
81
82static void init_clock(void)
83{
84 clock_fd = sys_perf_event_open(&clock_attr, getpid(), -1, -1, 0);
85
86 if (clock_fd < 0 && errno == ENOSYS)
87 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
88 else
89 BUG_ON(clock_fd < 0);
90}
91
92static u64 get_clock(void)
93{
94 int ret;
95 u64 clk;
96
97 ret = read(clock_fd, &clk, sizeof(u64));
98 BUG_ON(ret != sizeof(u64));
99
100 return clk;
101}
102
103static double timeval2double(struct timeval *ts)
104{
105 return (double)ts->tv_sec +
106 (double)ts->tv_usec / (double)1000000;
107}
108
109static void alloc_mem(void **dst, void **src, size_t length)
110{
111 *dst = zalloc(length);
112 if (!dst)
113 die("memory allocation failed - maybe length is too large?\n");
114
115 *src = zalloc(length);
116 if (!src)
117 die("memory allocation failed - maybe length is too large?\n");
118}
119
120static u64 do_memcpy_clock(memcpy_t fn, size_t len, bool prefault)
121{
122 u64 clock_start = 0ULL, clock_end = 0ULL;
123 void *src = NULL, *dst = NULL;
124
125 alloc_mem(&src, &dst, len);
126
127 if (prefault)
128 fn(dst, src, len);
129
130 clock_start = get_clock();
131 fn(dst, src, len);
132 clock_end = get_clock();
133
134 free(src);
135 free(dst);
136 return clock_end - clock_start;
137}
138
139static double do_memcpy_gettimeofday(memcpy_t fn, size_t len, bool prefault)
140{
141 struct timeval tv_start, tv_end, tv_diff;
142 void *src = NULL, *dst = NULL;
143
144 alloc_mem(&src, &dst, len);
145
146 if (prefault)
147 fn(dst, src, len);
148
149 BUG_ON(gettimeofday(&tv_start, NULL));
150 fn(dst, src, len);
151 BUG_ON(gettimeofday(&tv_end, NULL));
152
153 timersub(&tv_end, &tv_start, &tv_diff);
154
155 free(src);
156 free(dst);
157 return (double)((double)len / timeval2double(&tv_diff));
158}
159
160#define pf (no_prefault ? 0 : 1)
161
162#define print_bps(x) do { \
163 if (x < K) \
164 printf(" %14lf B/Sec", x); \
165 else if (x < K * K) \
166 printf(" %14lfd KB/Sec", x / K); \
167 else if (x < K * K * K) \
168 printf(" %14lf MB/Sec", x / K / K); \
169 else \
170 printf(" %14lf GB/Sec", x / K / K / K); \
171 } while (0)
172
173int bench_mem_memcpy(int argc, const char **argv,
174 const char *prefix __used)
175{
176 int i;
177 size_t len;
178 double result_bps[2];
179 u64 result_clock[2];
180
181 argc = parse_options(argc, argv, options,
182 bench_mem_memcpy_usage, 0);
183
184 if (use_clock)
185 init_clock();
186
187 len = (size_t)perf_atoll((char *)length_str);
188
189 result_clock[0] = result_clock[1] = 0ULL;
190 result_bps[0] = result_bps[1] = 0.0;
191
192 if ((s64)len <= 0) {
193 fprintf(stderr, "Invalid length:%s\n", length_str);
194 return 1;
195 }
196
197
198 if (only_prefault && no_prefault)
199 only_prefault = no_prefault = false;
200
201 for (i = 0; routines[i].name; i++) {
202 if (!strcmp(routines[i].name, routine))
203 break;
204 }
205 if (!routines[i].name) {
206 printf("Unknown routine:%s\n", routine);
207 printf("Available routines...\n");
208 for (i = 0; routines[i].name; i++) {
209 printf("\t%s ... %s\n",
210 routines[i].name, routines[i].desc);
211 }
212 return 1;
213 }
214
215 if (bench_format == BENCH_FORMAT_DEFAULT)
216 printf("# Copying %s Bytes ...\n\n", length_str);
217
218 if (!only_prefault && !no_prefault) {
219
220 if (use_clock) {
221 result_clock[0] =
222 do_memcpy_clock(routines[i].fn, len, false);
223 result_clock[1] =
224 do_memcpy_clock(routines[i].fn, len, true);
225 } else {
226 result_bps[0] =
227 do_memcpy_gettimeofday(routines[i].fn,
228 len, false);
229 result_bps[1] =
230 do_memcpy_gettimeofday(routines[i].fn,
231 len, true);
232 }
233 } else {
234 if (use_clock) {
235 result_clock[pf] =
236 do_memcpy_clock(routines[i].fn,
237 len, only_prefault);
238 } else {
239 result_bps[pf] =
240 do_memcpy_gettimeofday(routines[i].fn,
241 len, only_prefault);
242 }
243 }
244
245 switch (bench_format) {
246 case BENCH_FORMAT_DEFAULT:
247 if (!only_prefault && !no_prefault) {
248 if (use_clock) {
249 printf(" %14lf Clock/Byte\n",
250 (double)result_clock[0]
251 / (double)len);
252 printf(" %14lf Clock/Byte (with prefault)\n",
253 (double)result_clock[1]
254 / (double)len);
255 } else {
256 print_bps(result_bps[0]);
257 printf("\n");
258 print_bps(result_bps[1]);
259 printf(" (with prefault)\n");
260 }
261 } else {
262 if (use_clock) {
263 printf(" %14lf Clock/Byte",
264 (double)result_clock[pf]
265 / (double)len);
266 } else
267 print_bps(result_bps[pf]);
268
269 printf("%s\n", only_prefault ? " (with prefault)" : "");
270 }
271 break;
272 case BENCH_FORMAT_SIMPLE:
273 if (!only_prefault && !no_prefault) {
274 if (use_clock) {
275 printf("%lf %lf\n",
276 (double)result_clock[0] / (double)len,
277 (double)result_clock[1] / (double)len);
278 } else {
279 printf("%lf %lf\n",
280 result_bps[0], result_bps[1]);
281 }
282 } else {
283 if (use_clock) {
284 printf("%lf\n", (double)result_clock[pf]
285 / (double)len);
286 } else
287 printf("%lf\n", result_bps[pf]);
288 }
289 break;
290 default:
291
292 die("unknown format: %d\n", bench_format);
293 break;
294 }
295
296 return 0;
297}
298
