lkml.org 
[lkml]   [2012]   [Jan]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 3/4] perf/x86-64: also allow measuring memset()
This simply clones the respective memcpy() implementation.

Signed-off-by: Jan Beulich <jbeulich@suse.com>

--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -63,7 +63,7 @@ ifeq ($(ARCH),x86_64)
ifeq (${IS_X86_64}, 1)
RAW_ARCH := x86_64
ARCH_CFLAGS := -DARCH_X86_64
- ARCH_INCLUDE = ../../arch/x86/lib/memcpy_64.S
+ ARCH_INCLUDE = ../../arch/x86/lib/memcpy_64.S ../../arch/x86/lib/memset_64.S
endif
endif

@@ -363,8 +363,10 @@ BUILTIN_OBJS += $(OUTPUT)bench/sched-mes
BUILTIN_OBJS += $(OUTPUT)bench/sched-pipe.o
ifeq ($(RAW_ARCH),x86_64)
BUILTIN_OBJS += $(OUTPUT)bench/mem-memcpy-x86-64-asm.o
+BUILTIN_OBJS += $(OUTPUT)bench/mem-memset-x86-64-asm.o
endif
BUILTIN_OBJS += $(OUTPUT)bench/mem-memcpy.o
+BUILTIN_OBJS += $(OUTPUT)bench/mem-memset.o

BUILTIN_OBJS += $(OUTPUT)builtin-diff.o
BUILTIN_OBJS += $(OUTPUT)builtin-evlist.o
--- a/tools/perf/bench/bench.h
+++ b/tools/perf/bench/bench.h
@@ -4,6 +4,7 @@
extern int bench_sched_messaging(int argc, const char **argv, const char *prefix);
extern int bench_sched_pipe(int argc, const char **argv, const char *prefix);
extern int bench_mem_memcpy(int argc, const char **argv, const char *prefix __used);
+extern int bench_mem_memset(int argc, const char **argv, const char *prefix);

#define BENCH_FORMAT_DEFAULT_STR "default"
#define BENCH_FORMAT_DEFAULT 0
--- /dev/null
+++ b/tools/perf/bench/mem-memset.c
@@ -0,0 +1,291 @@
+/*
+ * mem-memset.c
+ *
+ * memset: Simple memory set in various ways
+ *
+ * Trivial clone of mem-memcpy.c.
+ */
+#include <ctype.h>
+
+#include "../perf.h"
+#include "../util/util.h"
+#include "../util/parse-options.h"
+#include "../util/header.h"
+#include "bench.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 bool use_clock;
+static int clock_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 unit: B, MB, GB (upper and lower)"),
+ OPT_STRING('r', "routine", &routine, "default",
+ "Specify routine to copy"),
+ OPT_BOOLEAN('c', "clock", &use_clock,
+ "Use CPU clock for measuring"),
+ OPT_BOOLEAN('o', "only-prefault", &only_prefault,
+ "Show only the result with page faults before memset()"),
+ OPT_BOOLEAN('n', "no-prefault", &no_prefault,
+ "Show only the result without page faults before memset()"),
+ OPT_END()
+};
+
+typedef void *(*memset_t)(void *, int, size_t);
+
+struct routine {
+ const char *name;
+ const char *desc;
+ memset_t fn;
+};
+
+static const struct routine routines[] = {
+ { "default",
+ "Default memset() provided by glibc",
+ memset },
+#ifdef ARCH_X86_64
+
+#define MEMSET_FN(fn, name, desc) { name, desc, fn },
+#include "mem-memset-x86-64-asm-def.h"
+#undef MEMSET_FN
+
+#endif
+
+ { NULL,
+ NULL,
+ NULL }
+};
+
+static const char * const bench_mem_memset_usage[] = {
+ "perf bench mem memset <options>",
+ NULL
+};
+
+static struct perf_event_attr clock_attr = {
+ .type = PERF_TYPE_HARDWARE,
+ .config = PERF_COUNT_HW_CPU_CYCLES
+};
+
+static void init_clock(void)
+{
+ clock_fd = sys_perf_event_open(&clock_attr, getpid(), -1, -1, 0);
+
+ if (clock_fd < 0 && errno == ENOSYS)
+ die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
+ else
+ BUG_ON(clock_fd < 0);
+}
+
+static u64 get_clock(void)
+{
+ int ret;
+ u64 clk;
+
+ ret = read(clock_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;
+}
+
+static void 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_clock(memset_t fn, size_t len, bool prefault)
+{
+ u64 clock_start = 0ULL, clock_end = 0ULL;
+ void *dst = NULL;
+
+ alloc_mem(&dst, len);
+
+ if (prefault)
+ fn(dst, -1, len);
+
+ clock_start = get_clock();
+ fn(dst, 0, len);
+ clock_end = get_clock();
+
+ free(dst);
+ return clock_end - clock_start;
+}
+
+static double do_memset_gettimeofday(memset_t fn, size_t len, bool prefault)
+{
+ struct timeval tv_start, tv_end, tv_diff;
+ void *dst = NULL;
+
+ alloc_mem(&dst, len);
+
+ if (prefault)
+ fn(dst, -1, len);
+
+ BUG_ON(gettimeofday(&tv_start, NULL));
+ fn(dst, 0, len);
+ BUG_ON(gettimeofday(&tv_end, NULL));
+
+ timersub(&tv_end, &tv_start, &tv_diff);
+
+ free(dst);
+ return (double)((double)len / timeval2double(&tv_diff));
+}
+
+#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)
+
+int bench_mem_memset(int argc, const char **argv,
+ const char *prefix __used)
+{
+ int i;
+ size_t len;
+ double result_bps[2];
+ u64 result_clock[2];
+
+ argc = parse_options(argc, argv, options,
+ bench_mem_memset_usage, 0);
+
+ if (use_clock)
+ init_clock();
+
+ len = (size_t)perf_atoll((char *)length_str);
+
+ result_clock[0] = result_clock[1] = 0ULL;
+ result_bps[0] = result_bps[1] = 0.0;
+
+ 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;
+
+ for (i = 0; routines[i].name; i++) {
+ if (!strcmp(routines[i].name, routine))
+ break;
+ }
+ if (!routines[i].name) {
+ printf("Unknown routine:%s\n", routine);
+ printf("Available routines...\n");
+ for (i = 0; routines[i].name; i++) {
+ printf("\t%s ... %s\n",
+ routines[i].name, routines[i].desc);
+ }
+ return 1;
+ }
+
+ 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_clock) {
+ result_clock[0] =
+ do_memset_clock(routines[i].fn, len, false);
+ result_clock[1] =
+ do_memset_clock(routines[i].fn, len, true);
+ } else {
+ result_bps[0] =
+ do_memset_gettimeofday(routines[i].fn,
+ len, false);
+ result_bps[1] =
+ do_memset_gettimeofday(routines[i].fn,
+ len, true);
+ }
+ } else {
+ if (use_clock) {
+ result_clock[pf] =
+ do_memset_clock(routines[i].fn,
+ len, only_prefault);
+ } else {
+ result_bps[pf] =
+ do_memset_gettimeofday(routines[i].fn,
+ len, only_prefault);
+ }
+ }
+
+ switch (bench_format) {
+ case BENCH_FORMAT_DEFAULT:
+ if (!only_prefault && !no_prefault) {
+ if (use_clock) {
+ printf(" %14lf Clock/Byte\n",
+ (double)result_clock[0]
+ / (double)len);
+ printf(" %14lf Clock/Byte (with prefault)\n",
+ (double)result_clock[1]
+ / (double)len);
+ } else {
+ print_bps(result_bps[0]);
+ printf("\n");
+ print_bps(result_bps[1]);
+ printf(" (with prefault)\n");
+ }
+ } else {
+ if (use_clock) {
+ printf(" %14lf Clock/Byte",
+ (double)result_clock[pf]
+ / (double)len);
+ } 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_clock) {
+ printf("%lf %lf\n",
+ (double)result_clock[0] / (double)len,
+ (double)result_clock[1] / (double)len);
+ } else {
+ printf("%lf %lf\n",
+ result_bps[0], result_bps[1]);
+ }
+ } else {
+ if (use_clock) {
+ printf("%lf\n", (double)result_clock[pf]
+ / (double)len);
+ } else
+ printf("%lf\n", result_bps[pf]);
+ }
+ break;
+ default:
+ /* reaching this means there's some disaster: */
+ die("unknown format: %d\n", bench_format);
+ break;
+ }
+
+ return 0;
+}
--- /dev/null
+++ b/tools/perf/bench/mem-memset-arch.h
@@ -0,0 +1,12 @@
+
+#ifdef ARCH_X86_64
+
+#define MEMSET_FN(fn, name, desc) \
+ extern void *fn(void *, int, size_t);
+
+#include "mem-memset-x86-64-asm-def.h"
+
+#undef MEMSET_FN
+
+#endif
+
--- /dev/null
+++ b/tools/perf/bench/mem-memset-x86-64-asm.S
@@ -0,0 +1,6 @@
+#define memset MEMSET /* don't hide glibc's memset() */
+#define altinstr_replacement text
+#define globl p2align 4; .globl
+#define Lmemset_c globl memset_c; memset_c
+#define Lmemset_c_e globl memset_c_e; memset_c_e
+#include "../../../arch/x86/lib/memset_64.S"
--- /dev/null
+++ b/tools/perf/bench/mem-memset-x86-64-asm-def.h
@@ -0,0 +1,12 @@
+
+MEMSET_FN(__memset,
+ "x86-64-unrolled",
+ "unrolled memset() in arch/x86/lib/memset_64.S")
+
+MEMSET_FN(memset_c,
+ "x86-64-stosq",
+ "movsq-based memset() in arch/x86/lib/memset_64.S")
+
+MEMSET_FN(memset_c_e,
+ "x86-64-stosb",
+ "movsb-based memset() in arch/x86/lib/memset_64.S")
--- a/tools/perf/builtin-bench.c
+++ b/tools/perf/builtin-bench.c
@@ -52,6 +52,9 @@ static struct bench_suite mem_suites[] =
{ "memcpy",
"Simple memory copy in various ways",
bench_mem_memcpy },
+ { "memset",
+ "Simple memory set in various ways",
+ bench_mem_memset },
suite_all,
{ NULL,
NULL,
--- a/tools/perf/util/include/asm/dwarf2.h
+++ b/tools/perf/util/include/asm/dwarf2.h
@@ -2,10 +2,12 @@
#ifndef PERF_DWARF2_H
#define PERF_DWARF2_H

-/* dwarf2.h ... dummy header file for including arch/x86/lib/memcpy_64.S */
+/* dwarf2.h ... dummy header file for including arch/x86/lib/mem{cpy,set}_64.S */

#define CFI_STARTPROC
#define CFI_ENDPROC
+#define CFI_REMEMBER_STATE
+#define CFI_RESTORE_STATE

#endif /* PERF_DWARF2_H */




\
 
 \ /
  Last update: 2012-01-18 14:31    [from the cache]
©2003-2011 Jasper Spaans