Date:	Mon, 19 Oct 2015 16:35:20 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Namhyung Kim <namhyung@...nel.org>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 04/14] perf/bench: Rename 'mem-memcpy.c' =>
 'mem-functions.c'

Em Mon, Oct 19, 2015 at 10:04:20AM +0200, Ingo Molnar escreveu:
> So mem-memcpy.c started out as a simple memcpy() benchmark, then
> it grew memset() functionality and now I plan to add string copy
> benchmarks as well.
> 
> This makes the file name a misnomer: rename it to the more generic
> mem-functions.c name.
> 
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> ---
>  tools/perf/bench/Build           |   2 +-
>  tools/perf/bench/mem-functions.c | 420 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Oops, this is not renaming anything, right? And it also introducs
__unused usage, which breaks the build.

Lemme try to do it...

- Arnaldo

>  2 files changed, 421 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/bench/Build b/tools/perf/bench/Build
> index 573e28896038..60bf11943047 100644
> --- a/tools/perf/bench/Build
> +++ b/tools/perf/bench/Build
> @@ -1,6 +1,6 @@
>  perf-y += sched-messaging.o
>  perf-y += sched-pipe.o
> -perf-y += mem-memcpy.o
> +perf-y += mem-functions.o
>  perf-y += futex-hash.o
>  perf-y += futex-wake.o
>  perf-y += futex-wake-parallel.o
> diff --git a/tools/perf/bench/mem-functions.c b/tools/perf/bench/mem-functions.c
> new file mode 100644
> index 000000000000..8f91c2e6b459
> --- /dev/null
> +++ b/tools/perf/bench/mem-functions.c
> @@ -0,0 +1,420 @@
> +/*
> + * mem-functions.c
> + *
> + * Simple memcpy() and memset() benchmarks.
> + *
> + * Written by Hitoshi Mitake <mitake@....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	= "all";
> +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, "all",
> +		    "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, }
> +};
> +
> +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 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];
> +	int prefault = no_prefault ? 0 : 1;
> +
> +	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 && prefault) {
> +		/* Show both 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[prefault] = info->do_cycle(r, len, only_prefault);
> +		else
> +			result_bps[prefault] = info->do_gettimeofday(r, len, only_prefault);
> +	}
> +
> +	switch (bench_format) {
> +	case BENCH_FORMAT_DEFAULT:
> +		if (!only_prefault && 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[prefault]
> +					/ totallen);
> +			} else
> +				print_bps(result_bps[prefault]);
> +
> +			printf("%s\n", only_prefault ? " (with prefault)" : "");
> +		}
> +		break;
> +	case BENCH_FORMAT_SIMPLE:
> +		if (!only_prefault && 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[prefault]
> +					/ totallen);
> +			} else
> +				printf("%lf\n", result_bps[prefault]);
> +		}
> +		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, 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 as 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 prefault 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 __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, &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
> +
> +	{ NULL, }
> +};
> +
> +int bench_mem_memset(int argc, const char **argv, const char *prefix __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, &info);
> +}
> -- 
> 2.1.4
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