Date:	Mon, 19 Oct 2015 10:04:22 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	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: [PATCH 06/14] perf/bench: List output formatting options on 'perf bench -h'

So 'perf bench -h' is not very helpful when printing the help line
about the output formatting options:

    -f, --format <default>
                              Specify format style

There are two output format styles, 'default' and 'simple', so improve
the help text to:

    -f, --format <default|simple>
                              Specify the output formatting style

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/mem-functions.c |   4 +-
 tools/perf/bench/mem-memcpy.c    | 420 -----------------------------------------------------------
 tools/perf/builtin-bench.c       |   2 +-
 3 files changed, 3 insertions(+), 423 deletions(-)

diff --git a/tools/perf/bench/mem-functions.c b/tools/perf/bench/mem-functions.c
index 33de5d57a163..d822ee0c6003 100644
--- a/tools/perf/bench/mem-functions.c
+++ b/tools/perf/bench/mem-functions.c
@@ -273,7 +273,7 @@ static double do_memcpy_gettimeofday(const struct routine *r, size_t len)
 	return (double)(((double)len * iterations) / timeval2double(&tv_diff));
 }
 
-int bench_mem_memcpy(int argc, const char **argv, const char *prefix __unused)
+int bench_mem_memcpy(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	struct bench_mem_info info = {
 		.routines		= memcpy_routines,
@@ -361,7 +361,7 @@ static const struct routine memset_routines[] = {
 	{ NULL, }
 };
 
-int bench_mem_memset(int argc, const char **argv, const char *prefix __unused)
+int bench_mem_memset(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	struct bench_mem_info info = {
 		.routines		= memset_routines,
diff --git a/tools/perf/bench/mem-memcpy.c b/tools/perf/bench/mem-memcpy.c
deleted file mode 100644
index 7acb9b83382c..000000000000
--- a/tools/perf/bench/mem-memcpy.c
+++ /dev/null
@@ -1,420 +0,0 @@
-/*
- * mem-memcpy.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 __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, &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 __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, &info);
-}
diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c
index f67934d46d40..1b585213ba5a 100644
--- a/tools/perf/builtin-bench.c
+++ b/tools/perf/builtin-bench.c
@@ -110,7 +110,7 @@ int bench_format = BENCH_FORMAT_DEFAULT;
 unsigned int bench_repeat = 10; /* default number of times to repeat the run */
 
 static const struct option bench_options[] = {
-	OPT_STRING('f', "format", &bench_format_str, "default", "Specify format style"),
+	OPT_STRING('f', "format", &bench_format_str, "default|simple", "Specify the output formatting style"),
 	OPT_UINTEGER('r', "repeat",  &bench_repeat,   "Specify amount of times to repeat the run"),
 	OPT_END()
 };
-- 
2.1.4

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