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![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
This way we type less characters and it looks more like the kzalloc kernel counterpart. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1259071517-3242-3-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
193 lines
4.1 KiB
C
193 lines
4.1 KiB
C
/*
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* mem-memcpy.c
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*
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* memcpy: Simple memory copy in various ways
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*
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* Written by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
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*/
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#include <ctype.h>
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#include "../perf.h"
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#include "../util/util.h"
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#include "../util/parse-options.h"
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#include "../util/string.h"
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#include "../util/header.h"
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#include "bench.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include <errno.h>
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#define K 1024
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static const char *length_str = "1MB";
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static const char *routine = "default";
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static int use_clock = 0;
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static int clock_fd;
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static const struct option options[] = {
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OPT_STRING('l', "length", &length_str, "1MB",
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"Specify length of memory to copy. "
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"available unit: B, MB, GB (upper and lower)"),
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OPT_STRING('r', "routine", &routine, "default",
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"Specify routine to copy"),
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OPT_BOOLEAN('c', "clock", &use_clock,
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"Use CPU clock for measuring"),
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OPT_END()
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};
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struct routine {
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const char *name;
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const char *desc;
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void * (*fn)(void *dst, const void *src, size_t len);
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};
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struct routine routines[] = {
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{ "default",
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"Default memcpy() provided by glibc",
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memcpy },
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{ NULL,
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NULL,
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NULL }
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};
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static const char * const bench_mem_memcpy_usage[] = {
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"perf bench mem memcpy <options>",
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NULL
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};
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static struct perf_event_attr clock_attr = {
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.type = PERF_TYPE_HARDWARE,
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.config = PERF_COUNT_HW_CPU_CYCLES
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};
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static void init_clock(void)
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{
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clock_fd = sys_perf_event_open(&clock_attr, getpid(), -1, -1, 0);
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if (clock_fd < 0 && errno == ENOSYS)
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die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
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else
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BUG_ON(clock_fd < 0);
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}
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static u64 get_clock(void)
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{
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int ret;
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u64 clk;
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ret = read(clock_fd, &clk, sizeof(u64));
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BUG_ON(ret != sizeof(u64));
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return clk;
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}
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static double timeval2double(struct timeval *ts)
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{
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return (double)ts->tv_sec +
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(double)ts->tv_usec / (double)1000000;
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}
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int bench_mem_memcpy(int argc, const char **argv,
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const char *prefix __used)
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{
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int i;
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void *dst, *src;
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size_t length;
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double bps = 0.0;
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struct timeval tv_start, tv_end, tv_diff;
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u64 clock_start, clock_end, clock_diff;
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clock_start = clock_end = clock_diff = 0ULL;
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argc = parse_options(argc, argv, options,
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bench_mem_memcpy_usage, 0);
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tv_diff.tv_sec = 0;
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tv_diff.tv_usec = 0;
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length = (size_t)perf_atoll((char *)length_str);
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if ((s64)length <= 0) {
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fprintf(stderr, "Invalid length:%s\n", length_str);
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return 1;
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}
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for (i = 0; routines[i].name; i++) {
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if (!strcmp(routines[i].name, routine))
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break;
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}
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if (!routines[i].name) {
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printf("Unknown routine:%s\n", routine);
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printf("Available routines...\n");
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for (i = 0; routines[i].name; i++) {
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printf("\t%s ... %s\n",
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routines[i].name, routines[i].desc);
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}
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return 1;
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}
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dst = zalloc(length);
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if (!dst)
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die("memory allocation failed - maybe length is too large?\n");
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src = zalloc(length);
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if (!src)
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die("memory allocation failed - maybe length is too large?\n");
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if (bench_format == BENCH_FORMAT_DEFAULT) {
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printf("# Copying %s Bytes from %p to %p ...\n\n",
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length_str, src, dst);
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}
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if (use_clock) {
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init_clock();
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clock_start = get_clock();
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} else {
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BUG_ON(gettimeofday(&tv_start, NULL));
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}
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routines[i].fn(dst, src, length);
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if (use_clock) {
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clock_end = get_clock();
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clock_diff = clock_end - clock_start;
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} else {
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BUG_ON(gettimeofday(&tv_end, NULL));
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timersub(&tv_end, &tv_start, &tv_diff);
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bps = (double)((double)length / timeval2double(&tv_diff));
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}
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switch (bench_format) {
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case BENCH_FORMAT_DEFAULT:
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if (use_clock) {
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printf(" %14lf Clock/Byte\n",
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(double)clock_diff / (double)length);
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} else {
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if (bps < K)
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printf(" %14lf B/Sec\n", bps);
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else if (bps < K * K)
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printf(" %14lfd KB/Sec\n", bps / 1024);
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else if (bps < K * K * K)
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printf(" %14lf MB/Sec\n", bps / 1024 / 1024);
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else {
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printf(" %14lf GB/Sec\n",
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bps / 1024 / 1024 / 1024);
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}
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}
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break;
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case BENCH_FORMAT_SIMPLE:
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if (use_clock) {
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printf("%14lf\n",
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(double)clock_diff / (double)length);
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} else
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printf("%lf\n", bps);
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break;
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default:
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/* reaching this means there's some disaster: */
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die("unknown format: %d\n", bench_format);
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break;
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}
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return 0;
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}
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