tools/perf/bench/mem-memcpy.c - kernel/msm-4.9 - Gitiles

 /*
  * mem-memcpy.c
  *
  * memcpy: Simple memory copy in various ways
  *
  * Written by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
  */

 #include "../perf.h"
 #include "../util/util.h"
 #include "../util/parse-options.h"
 #include "../util/header.h"
 #include "../util/cloexec.h"
 #include "bench.h"
 #include "mem-memcpy-arch.h"
 #include "mem-memset-arch.h"

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/time.h>
 #include <errno.h>

 #define K 1024

 static const char	*length_str	= "1MB";
 static const char	*routine	= "default";
 static int		iterations	= 1;
 static bool		use_cycle;
 static int		cycle_fd;
 static bool		only_prefault;
 static bool		no_prefault;

 static const struct option options[] = {
 	OPT_STRING('l', "length", &length_str, "1MB",
 		    "Specify length of memory to copy. "
 		    "Available units: B, KB, MB, GB and TB (upper and lower)"),
 	OPT_STRING('r', "routine", &routine, "default",
 		    "Specify routine to copy, \"all\" runs all available routines"),
 	OPT_INTEGER('i', "iterations", &iterations,
 		    "repeat memcpy() invocation this number of times"),
 	OPT_BOOLEAN('c', "cycle", &use_cycle,
 		    "Use cycles event instead of gettimeofday() for measuring"),
 	OPT_BOOLEAN('o', "only-prefault", &only_prefault,
 		    "Show only the result with page faults before memcpy()"),
 	OPT_BOOLEAN('n', "no-prefault", &no_prefault,
 		    "Show only the result without page faults before memcpy()"),
 	OPT_END()
 };

 typedef void *(*memcpy_t)(void *, const void *, size_t);
 typedef void *(*memset_t)(void *, int, size_t);

 struct routine {
 	const char *name;
 	const char *desc;
 	union {
 		memcpy_t memcpy;
 		memset_t memset;
 	} fn;
 };

 struct routine memcpy_routines[] = {
 	{ .name = "default",
 	  .desc = "Default memcpy() provided by glibc",
 	  .fn.memcpy = memcpy },
 #ifdef HAVE_ARCH_X86_64_SUPPORT

 #define MEMCPY_FN(_fn, _name, _desc) {.name = _name, .desc = _desc, .fn.memcpy = _fn},
 #include "mem-memcpy-x86-64-asm-def.h"
 #undef MEMCPY_FN

 #endif

 	{ NULL,
 	  NULL,
 	  {NULL}   }
 };

 static const char * const bench_mem_memcpy_usage[] = {
 	"perf bench mem memcpy <options>",
 	NULL
 };

 static struct perf_event_attr cycle_attr = {
 	.type		= PERF_TYPE_HARDWARE,
 	.config		= PERF_COUNT_HW_CPU_CYCLES
 };

 static void init_cycle(void)
 {
 	cycle_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1,
 				       perf_event_open_cloexec_flag());

 	if (cycle_fd < 0 && errno == ENOSYS)
 		die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
 	else
 		BUG_ON(cycle_fd < 0);
 }

 static u64 get_cycle(void)
 {
 	int ret;
 	u64 clk;

 	ret = read(cycle_fd, &clk, sizeof(u64));
 	BUG_ON(ret != sizeof(u64));

 	return clk;
 }

 static double timeval2double(struct timeval *ts)
 {
 	return (double)ts->tv_sec +
 		(double)ts->tv_usec / (double)1000000;
 }

 #define pf (no_prefault ? 0 : 1)

 #define print_bps(x) do {					\
 		if (x < K)					\
 			printf(" %14lf B/Sec", x);		\
 		else if (x < K * K)				\
 			printf(" %14lfd KB/Sec", x / K);	\
 		else if (x < K * K * K)				\
 			printf(" %14lf MB/Sec", x / K / K);	\
 		else						\
 			printf(" %14lf GB/Sec", x / K / K / K); \
 	} while (0)

 struct bench_mem_info {
 	const struct routine *routines;
 	u64 (*do_cycle)(const struct routine *r, size_t len, bool prefault);
 	double (*do_gettimeofday)(const struct routine *r, size_t len, bool prefault);
 	const char *const *usage;
 };

 static void __bench_mem_routine(struct bench_mem_info *info, int r_idx, size_t len, double totallen)
 {
 	const struct routine *r = &info->routines[r_idx];
 	double result_bps[2];
 	u64 result_cycle[2];

 	result_cycle[0] = result_cycle[1] = 0ULL;
 	result_bps[0] = result_bps[1] = 0.0;

 	printf("Routine %s (%s)\n", r->name, r->desc);

 	if (bench_format == BENCH_FORMAT_DEFAULT)
 		printf("# Copying %s Bytes ...\n\n", length_str);

 	if (!only_prefault && !no_prefault) {
 		/* show both of results */
 		if (use_cycle) {
 			result_cycle[0] = info->do_cycle(r, len, false);
 			result_cycle[1] = info->do_cycle(r, len, true);
 		} else {
 			result_bps[0]   = info->do_gettimeofday(r, len, false);
 			result_bps[1]   = info->do_gettimeofday(r, len, true);
 		}
 	} else {
 		if (use_cycle)
 			result_cycle[pf] = info->do_cycle(r, len, only_prefault);
 		else
 			result_bps[pf] = info->do_gettimeofday(r, len, only_prefault);
 	}

 	switch (bench_format) {
 	case BENCH_FORMAT_DEFAULT:
 		if (!only_prefault && !no_prefault) {
 			if (use_cycle) {
 				printf(" %14lf Cycle/Byte\n",
 					(double)result_cycle[0]
 					/ totallen);
 				printf(" %14lf Cycle/Byte (with prefault)\n",
 					(double)result_cycle[1]
 					/ totallen);
 			} else {
 				print_bps(result_bps[0]);
 				printf("\n");
 				print_bps(result_bps[1]);
 				printf(" (with prefault)\n");
 			}
 		} else {
 			if (use_cycle) {
 				printf(" %14lf Cycle/Byte",
 					(double)result_cycle[pf]
 					/ totallen);
 			} else
 				print_bps(result_bps[pf]);

 			printf("%s\n", only_prefault ? " (with prefault)" : "");
 		}
 		break;
 	case BENCH_FORMAT_SIMPLE:
 		if (!only_prefault && !no_prefault) {
 			if (use_cycle) {
 				printf("%lf %lf\n",
 					(double)result_cycle[0] / totallen,
 					(double)result_cycle[1] / totallen);
 			} else {
 				printf("%lf %lf\n",
 					result_bps[0], result_bps[1]);
 			}
 		} else {
 			if (use_cycle) {
 				printf("%lf\n", (double)result_cycle[pf]
 					/ totallen);
 			} else
 				printf("%lf\n", result_bps[pf]);
 		}
 		break;
 	default:
 		/* reaching this means there's some disaster: */
 		die("unknown format: %d\n", bench_format);
 		break;
 	}
 }

 static int bench_mem_common(int argc, const char **argv,
 		     const char *prefix __maybe_unused,
 		     struct bench_mem_info *info)
 {
 	int i;
 	size_t len;
 	double totallen;

 	argc = parse_options(argc, argv, options,
 			     info->usage, 0);

 	if (no_prefault && only_prefault) {
 		fprintf(stderr, "Invalid options: -o and -n are mutually exclusive\n");
 		return 1;
 	}

 	if (use_cycle)
 		init_cycle();

 	len = (size_t)perf_atoll((char *)length_str);
 	totallen = (double)len * iterations;

 	if ((s64)len <= 0) {
 		fprintf(stderr, "Invalid length:%s\n", length_str);
 		return 1;
 	}

 	/* same to without specifying either of prefault and no-prefault */
 	if (only_prefault && no_prefault)
 		only_prefault = no_prefault = false;

 	if (!strncmp(routine, "all", 3)) {
 		for (i = 0; info->routines[i].name; i++)
 			__bench_mem_routine(info, i, len, totallen);
 		return 0;
 	}

 	for (i = 0; info->routines[i].name; i++) {
 		if (!strcmp(info->routines[i].name, routine))
 			break;
 	}
 	if (!info->routines[i].name) {
 		printf("Unknown routine:%s\n", routine);
 		printf("Available routines...\n");
 		for (i = 0; info->routines[i].name; i++) {
 			printf("\t%s ... %s\n",
 			       info->routines[i].name, info->routines[i].desc);
 		}
 		return 1;
 	}

 	__bench_mem_routine(info, i, len, totallen);

 	return 0;
 }

 static void memcpy_alloc_mem(void **dst, void **src, size_t length)
 {
 	*dst = zalloc(length);
 	if (!*dst)
 		die("memory allocation failed - maybe length is too large?\n");

 	*src = zalloc(length);
 	if (!*src)
 		die("memory allocation failed - maybe length is too large?\n");
 	/* Make sure to always replace the zero pages even if MMAP_THRESH is crossed */
 	memset(*src, 0, length);
 }

 static u64 do_memcpy_cycle(const struct routine *r, size_t len, bool prefault)
 {
 	u64 cycle_start = 0ULL, cycle_end = 0ULL;
 	void *src = NULL, *dst = NULL;
 	memcpy_t fn = r->fn.memcpy;
 	int i;

 	memcpy_alloc_mem(&dst, &src, len);

 	if (prefault)
 		fn(dst, src, len);

 	cycle_start = get_cycle();
 	for (i = 0; i < iterations; ++i)
 		fn(dst, src, len);
 	cycle_end = get_cycle();

 	free(src);
 	free(dst);
 	return cycle_end - cycle_start;
 }

 static double do_memcpy_gettimeofday(const struct routine *r, size_t len,
 				     bool prefault)
 {
 	struct timeval tv_start, tv_end, tv_diff;
 	memcpy_t fn = r->fn.memcpy;
 	void *src = NULL, *dst = NULL;
 	int i;

 	memcpy_alloc_mem(&dst, &src, len);

 	if (prefault)
 		fn(dst, src, len);

 	BUG_ON(gettimeofday(&tv_start, NULL));
 	for (i = 0; i < iterations; ++i)
 		fn(dst, src, len);
 	BUG_ON(gettimeofday(&tv_end, NULL));

 	timersub(&tv_end, &tv_start, &tv_diff);

 	free(src);
 	free(dst);
 	return (double)(((double)len * iterations) / timeval2double(&tv_diff));
 }

 int bench_mem_memcpy(int argc, const char **argv,
 		     const char *prefix __maybe_unused)
 {
 	struct bench_mem_info info = {
 		.routines = memcpy_routines,
 		.do_cycle = do_memcpy_cycle,
 		.do_gettimeofday = do_memcpy_gettimeofday,
 		.usage = bench_mem_memcpy_usage,
 	};

 	return bench_mem_common(argc, argv, prefix, &info);
 }

 static void memset_alloc_mem(void **dst, size_t length)
 {
 	*dst = zalloc(length);
 	if (!*dst)
 		die("memory allocation failed - maybe length is too large?\n");
 }

 static u64 do_memset_cycle(const struct routine *r, size_t len, bool prefault)
 {
 	u64 cycle_start = 0ULL, cycle_end = 0ULL;
 	memset_t fn = r->fn.memset;
 	void *dst = NULL;
 	int i;

 	memset_alloc_mem(&dst, len);

 	if (prefault)
 		fn(dst, -1, len);

 	cycle_start = get_cycle();
 	for (i = 0; i < iterations; ++i)
 		fn(dst, i, len);
 	cycle_end = get_cycle();

 	free(dst);
 	return cycle_end - cycle_start;
 }

 static double do_memset_gettimeofday(const struct routine *r, size_t len,
 				     bool prefault)
 {
 	struct timeval tv_start, tv_end, tv_diff;
 	memset_t fn = r->fn.memset;
 	void *dst = NULL;
 	int i;

 	memset_alloc_mem(&dst, len);

 	if (prefault)
 		fn(dst, -1, len);

 	BUG_ON(gettimeofday(&tv_start, NULL));
 	for (i = 0; i < iterations; ++i)
 		fn(dst, i, len);
 	BUG_ON(gettimeofday(&tv_end, NULL));

 	timersub(&tv_end, &tv_start, &tv_diff);

 	free(dst);
 	return (double)(((double)len * iterations) / timeval2double(&tv_diff));
 }

 static const char * const bench_mem_memset_usage[] = {
 	"perf bench mem memset <options>",
 	NULL
 };

 static const struct routine memset_routines[] = {
 	{ .name ="default",
 	  .desc = "Default memset() provided by glibc",
 	  .fn.memset = memset },
 #ifdef HAVE_ARCH_X86_64_SUPPORT

 #define MEMSET_FN(_fn, _name, _desc) { .name = _name, .desc = _desc, .fn.memset = _fn },
 #include "mem-memset-x86-64-asm-def.h"
 #undef MEMSET_FN

 #endif

 	{ .name = NULL,
 	  .desc = NULL,
 	  .fn.memset = NULL   }
 };

 int bench_mem_memset(int argc, const char **argv,
 		     const char *prefix __maybe_unused)
 {
 	struct bench_mem_info info = {
 		.routines = memset_routines,
 		.do_cycle = do_memset_cycle,
 		.do_gettimeofday = do_memset_gettimeofday,
 		.usage = bench_mem_memset_usage,
 	};

 	return bench_mem_common(argc, argv, prefix, &info);
 }
	/*
	* mem-memcpy.c
	*
	* memcpy: Simple memory copy in various ways
	*
	* Written by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
	*/

	#include "../perf.h"
	#include "../util/util.h"
	#include "../util/parse-options.h"
	#include "../util/header.h"
	#include "../util/cloexec.h"
	#include "bench.h"
	#include "mem-memcpy-arch.h"
	#include "mem-memset-arch.h"

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/time.h>
	#include <errno.h>

	#define K 1024

	static const char *length_str = "1MB";
	static const char *routine = "default";
	static int iterations = 1;
	static bool use_cycle;
	static int cycle_fd;
	static bool only_prefault;
	static bool no_prefault;

	static const struct option options[] = {
	OPT_STRING('l', "length", &length_str, "1MB",
	"Specify length of memory to copy. "
	"Available units: B, KB, MB, GB and TB (upper and lower)"),
	OPT_STRING('r', "routine", &routine, "default",
	"Specify routine to copy, \"all\" runs all available routines"),
	OPT_INTEGER('i', "iterations", &iterations,
	"repeat memcpy() invocation this number of times"),
	OPT_BOOLEAN('c', "cycle", &use_cycle,
	"Use cycles event instead of gettimeofday() for measuring"),
	OPT_BOOLEAN('o', "only-prefault", &only_prefault,
	"Show only the result with page faults before memcpy()"),
	OPT_BOOLEAN('n', "no-prefault", &no_prefault,
	"Show only the result without page faults before memcpy()"),
	OPT_END()
	};

	typedef void (memcpy_t)(void , const void , size_t);
	typedef void (memset_t)(void *, int, size_t);

	struct routine {
	const char *name;
	const char *desc;
	union {
	memcpy_t memcpy;
	memset_t memset;
	} fn;
	};

	struct routine memcpy_routines[] = {
	{ .name = "default",
	.desc = "Default memcpy() provided by glibc",
	.fn.memcpy = memcpy },
	#ifdef HAVE_ARCH_X86_64_SUPPORT

	#define MEMCPY_FN(_fn, _name, _desc) {.name = _name, .desc = _desc, .fn.memcpy = _fn},
	#include "mem-memcpy-x86-64-asm-def.h"
	#undef MEMCPY_FN

	#endif

	{ NULL,
	NULL,
	{NULL} }
	};

	static const char * const bench_mem_memcpy_usage[] = {
	"perf bench mem memcpy <options>",
	NULL
	};

	static struct perf_event_attr cycle_attr = {
	.type = PERF_TYPE_HARDWARE,
	.config = PERF_COUNT_HW_CPU_CYCLES
	};

	static void init_cycle(void)
	{
	cycle_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1,
	perf_event_open_cloexec_flag());

	if (cycle_fd < 0 && errno == ENOSYS)
	die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
	else
	BUG_ON(cycle_fd < 0);
	}

	static u64 get_cycle(void)
	{
	int ret;
	u64 clk;

	ret = read(cycle_fd, &clk, sizeof(u64));
	BUG_ON(ret != sizeof(u64));

	return clk;
	}

	static double timeval2double(struct timeval *ts)
	{
	return (double)ts->tv_sec +
	(double)ts->tv_usec / (double)1000000;
	}

	#define pf (no_prefault ? 0 : 1)

	#define print_bps(x) do { \
	if (x < K) \
	printf(" %14lf B/Sec", x); \
	else if (x < K * K) \
	printf(" %14lfd KB/Sec", x / K); \
	else if (x < K * K * K) \
	printf(" %14lf MB/Sec", x / K / K); \
	else \
	printf(" %14lf GB/Sec", x / K / K / K); \
	} while (0)

	struct bench_mem_info {
	const struct routine *routines;
	u64 (do_cycle)(const struct routine r, size_t len, bool prefault);
	double (do_gettimeofday)(const struct routine r, size_t len, bool prefault);
	const char const usage;
	};

	static void __bench_mem_routine(struct bench_mem_info *info, int r_idx, size_t len, double totallen)
	{
	const struct routine *r = &info->routines[r_idx];
	double result_bps[2];
	u64 result_cycle[2];

	result_cycle[0] = result_cycle[1] = 0ULL;
	result_bps[0] = result_bps[1] = 0.0;

	printf("Routine %s (%s)\n", r->name, r->desc);

	if (bench_format == BENCH_FORMAT_DEFAULT)
	printf("# Copying %s Bytes ...\n\n", length_str);

	if (!only_prefault && !no_prefault) {
	/* show both of results */
	if (use_cycle) {
	result_cycle[0] = info->do_cycle(r, len, false);
	result_cycle[1] = info->do_cycle(r, len, true);
	} else {
	result_bps[0] = info->do_gettimeofday(r, len, false);
	result_bps[1] = info->do_gettimeofday(r, len, true);
	}
	} else {
	if (use_cycle)
	result_cycle[pf] = info->do_cycle(r, len, only_prefault);
	else
	result_bps[pf] = info->do_gettimeofday(r, len, only_prefault);
	}

	switch (bench_format) {
	case BENCH_FORMAT_DEFAULT:
	if (!only_prefault && !no_prefault) {
	if (use_cycle) {
	printf(" %14lf Cycle/Byte\n",
	(double)result_cycle[0]
	/ totallen);
	printf(" %14lf Cycle/Byte (with prefault)\n",
	(double)result_cycle[1]
	/ totallen);
	} else {
	print_bps(result_bps[0]);
	printf("\n");
	print_bps(result_bps[1]);
	printf(" (with prefault)\n");
	}
	} else {
	if (use_cycle) {
	printf(" %14lf Cycle/Byte",
	(double)result_cycle[pf]
	/ totallen);
	} else
	print_bps(result_bps[pf]);

	printf("%s\n", only_prefault ? " (with prefault)" : "");
	}
	break;
	case BENCH_FORMAT_SIMPLE:
	if (!only_prefault && !no_prefault) {
	if (use_cycle) {
	printf("%lf %lf\n",
	(double)result_cycle[0] / totallen,
	(double)result_cycle[1] / totallen);
	} else {
	printf("%lf %lf\n",
	result_bps[0], result_bps[1]);
	}
	} else {
	if (use_cycle) {
	printf("%lf\n", (double)result_cycle[pf]
	/ totallen);
	} else
	printf("%lf\n", result_bps[pf]);
	}
	break;
	default:
	/* reaching this means there's some disaster: */
	die("unknown format: %d\n", bench_format);
	break;
	}
	}

	static int bench_mem_common(int argc, const char **argv,
	const char *prefix __maybe_unused,
	struct bench_mem_info *info)
	{
	int i;
	size_t len;
	double totallen;

	argc = parse_options(argc, argv, options,
	info->usage, 0);

	if (no_prefault && only_prefault) {
	fprintf(stderr, "Invalid options: -o and -n are mutually exclusive\n");
	return 1;
	}

	if (use_cycle)
	init_cycle();

	len = (size_t)perf_atoll((char *)length_str);
	totallen = (double)len * iterations;

	if ((s64)len <= 0) {
	fprintf(stderr, "Invalid length:%s\n", length_str);
	return 1;
	}

	/* same to without specifying either of prefault and no-prefault */
	if (only_prefault && no_prefault)
	only_prefault = no_prefault = false;

	if (!strncmp(routine, "all", 3)) {
	for (i = 0; info->routines[i].name; i++)
	__bench_mem_routine(info, i, len, totallen);
	return 0;
	}

	for (i = 0; info->routines[i].name; i++) {
	if (!strcmp(info->routines[i].name, routine))
	break;
	}
	if (!info->routines[i].name) {
	printf("Unknown routine:%s\n", routine);
	printf("Available routines...\n");
	for (i = 0; info->routines[i].name; i++) {
	printf("\t%s ... %s\n",
	info->routines[i].name, info->routines[i].desc);
	}
	return 1;
	}

	__bench_mem_routine(info, i, len, totallen);

	return 0;
	}

	static void memcpy_alloc_mem(void dst, void src, size_t length)
	{
	*dst = zalloc(length);
	if (!*dst)
	die("memory allocation failed - maybe length is too large?\n");

	*src = zalloc(length);
	if (!*src)
	die("memory allocation failed - maybe length is too large?\n");
	/* Make sure to always replace the zero pages even if MMAP_THRESH is crossed */
	memset(*src, 0, length);
	}

	static u64 do_memcpy_cycle(const struct routine *r, size_t len, bool prefault)
	{
	u64 cycle_start = 0ULL, cycle_end = 0ULL;
	void src = NULL, dst = NULL;
	memcpy_t fn = r->fn.memcpy;
	int i;

	memcpy_alloc_mem(&dst, &src, len);

	if (prefault)
	fn(dst, src, len);

	cycle_start = get_cycle();
	for (i = 0; i < iterations; ++i)
	fn(dst, src, len);
	cycle_end = get_cycle();

	free(src);
	free(dst);
	return cycle_end - cycle_start;
	}

	static double do_memcpy_gettimeofday(const struct routine *r, size_t len,
	bool prefault)
	{
	struct timeval tv_start, tv_end, tv_diff;
	memcpy_t fn = r->fn.memcpy;
	void src = NULL, dst = NULL;
	int i;

	memcpy_alloc_mem(&dst, &src, len);

	if (prefault)
	fn(dst, src, len);

	BUG_ON(gettimeofday(&tv_start, NULL));
	for (i = 0; i < iterations; ++i)
	fn(dst, src, len);
	BUG_ON(gettimeofday(&tv_end, NULL));

	timersub(&tv_end, &tv_start, &tv_diff);

	free(src);
	free(dst);
	return (double)(((double)len * iterations) / timeval2double(&tv_diff));
	}

	int bench_mem_memcpy(int argc, const char **argv,
	const char *prefix __maybe_unused)
	{
	struct bench_mem_info info = {
	.routines = memcpy_routines,
	.do_cycle = do_memcpy_cycle,
	.do_gettimeofday = do_memcpy_gettimeofday,
	.usage = bench_mem_memcpy_usage,
	};

	return bench_mem_common(argc, argv, prefix, &info);
	}

	static void memset_alloc_mem(void **dst, size_t length)
	{
	*dst = zalloc(length);
	if (!*dst)
	die("memory allocation failed - maybe length is too large?\n");
	}

	static u64 do_memset_cycle(const struct routine *r, size_t len, bool prefault)
	{
	u64 cycle_start = 0ULL, cycle_end = 0ULL;
	memset_t fn = r->fn.memset;
	void *dst = NULL;
	int i;

	memset_alloc_mem(&dst, len);

	if (prefault)
	fn(dst, -1, len);

	cycle_start = get_cycle();
	for (i = 0; i < iterations; ++i)
	fn(dst, i, len);
	cycle_end = get_cycle();

	free(dst);
	return cycle_end - cycle_start;
	}

	static double do_memset_gettimeofday(const struct routine *r, size_t len,
	bool prefault)
	{
	struct timeval tv_start, tv_end, tv_diff;
	memset_t fn = r->fn.memset;
	void *dst = NULL;
	int i;

	memset_alloc_mem(&dst, len);

	if (prefault)
	fn(dst, -1, len);

	BUG_ON(gettimeofday(&tv_start, NULL));
	for (i = 0; i < iterations; ++i)
	fn(dst, i, len);
	BUG_ON(gettimeofday(&tv_end, NULL));

	timersub(&tv_end, &tv_start, &tv_diff);

	free(dst);
	return (double)(((double)len * iterations) / timeval2double(&tv_diff));
	}

	static const char * const bench_mem_memset_usage[] = {
	"perf bench mem memset <options>",
	NULL
	};

	static const struct routine memset_routines[] = {
	{ .name ="default",
	.desc = "Default memset() provided by glibc",
	.fn.memset = memset },
	#ifdef HAVE_ARCH_X86_64_SUPPORT

	#define MEMSET_FN(_fn, _name, _desc) { .name = _name, .desc = _desc, .fn.memset = _fn },
	#include "mem-memset-x86-64-asm-def.h"
	#undef MEMSET_FN

	#endif

	{ .name = NULL,
	.desc = NULL,
	.fn.memset = NULL }
	};

	int bench_mem_memset(int argc, const char **argv,
	const char *prefix __maybe_unused)
	{
	struct bench_mem_info info = {
	.routines = memset_routines,
	.do_cycle = do_memset_cycle,
	.do_gettimeofday = do_memset_gettimeofday,
	.usage = bench_mem_memset_usage,
	};

	return bench_mem_common(argc, argv, prefix, &info);
	}