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// SPDX-License-Identifier: GPL-2.0
/*
* fill_buf benchmark
*
* Copyright (C) 2018 Intel Corporation
*
* Authors:
* Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
* Fenghua Yu <fenghua.yu@intel.com>
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <inttypes.h>
#include <malloc.h>
#include <string.h>
#include "resctrl.h"
#define CL_SIZE (64)
#define PAGE_SIZE (4 * 1024)
#define MB (1024 * 1024)
static unsigned char *startptr;
static void sb(void)
{
#if defined(__i386) || defined(__x86_64)
asm volatile("sfence\n\t"
: : : "memory");
#endif
}
static void ctrl_handler(int signo)
{
free(startptr);
printf("\nEnding\n");
sb();
exit(EXIT_SUCCESS);
}
static void cl_flush(void *p)
{
#if defined(__i386) || defined(__x86_64)
asm volatile("clflush (%0)\n\t"
: : "r"(p) : "memory");
#endif
}
static void mem_flush(void *p, size_t s)
{
char *cp = (char *)p;
size_t i = 0;
s = s / CL_SIZE; /* mem size in cache llines */
for (i = 0; i < s; i++)
cl_flush(&cp[i * CL_SIZE]);
sb();
}
static void *malloc_and_init_memory(size_t s)
{
uint64_t *p64;
size_t s64;
void *p = memalign(PAGE_SIZE, s);
p64 = (uint64_t *)p;
s64 = s / sizeof(uint64_t);
while (s64 > 0) {
*p64 = (uint64_t)rand();
p64 += (CL_SIZE / sizeof(uint64_t));
s64 -= (CL_SIZE / sizeof(uint64_t));
}
return p;
}
static int fill_one_span_read(unsigned char *start_ptr, unsigned char *end_ptr)
{
unsigned char sum, *p;
sum = 0;
p = start_ptr;
while (p < end_ptr) {
sum += *p;
p += (CL_SIZE / 2);
}
return sum;
}
static
void fill_one_span_write(unsigned char *start_ptr, unsigned char *end_ptr)
{
unsigned char *p;
p = start_ptr;
while (p < end_ptr) {
*p = '1';
p += (CL_SIZE / 2);
}
}
static int fill_cache_read(unsigned char *start_ptr, unsigned char *end_ptr,
char *resctrl_val)
{
int ret = 0;
FILE *fp;
while (1) {
ret = fill_one_span_read(start_ptr, end_ptr);
if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR)))
break;
}
/* Consume read result so that reading memory is not optimized out. */
fp = fopen("/dev/null", "w");
if (!fp) {
perror("Unable to write to /dev/null");
return -1;
}
fprintf(fp, "Sum: %d ", ret);
fclose(fp);
return 0;
}
static int fill_cache_write(unsigned char *start_ptr, unsigned char *end_ptr,
char *resctrl_val)
{
while (1) {
fill_one_span_write(start_ptr, end_ptr);
if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR)))
break;
}
return 0;
}
static int
fill_cache(unsigned long long buf_size, int malloc_and_init, int memflush,
int op, char *resctrl_val)
{
unsigned char *start_ptr, *end_ptr;
unsigned long long i;
int ret;
if (malloc_and_init)
start_ptr = malloc_and_init_memory(buf_size);
else
start_ptr = malloc(buf_size);
if (!start_ptr)
return -1;
startptr = start_ptr;
end_ptr = start_ptr + buf_size;
/*
* It's better to touch the memory once to avoid any compiler
* optimizations
*/
if (!malloc_and_init) {
for (i = 0; i < buf_size; i++)
*start_ptr++ = (unsigned char)rand();
}
start_ptr = startptr;
/* Flush the memory before using to avoid "cache hot pages" effect */
if (memflush)
mem_flush(start_ptr, buf_size);
if (op == 0)
ret = fill_cache_read(start_ptr, end_ptr, resctrl_val);
else
ret = fill_cache_write(start_ptr, end_ptr, resctrl_val);
if (ret) {
printf("\n Error in fill cache read/write...\n");
return -1;
}
free(startptr);
return 0;
}
int run_fill_buf(unsigned long span, int malloc_and_init_memory,
int memflush, int op, char *resctrl_val)
{
unsigned long long cache_size = span;
int ret;
/* set up ctrl-c handler */
if (signal(SIGINT, ctrl_handler) == SIG_ERR)
printf("Failed to catch SIGINT!\n");
if (signal(SIGHUP, ctrl_handler) == SIG_ERR)
printf("Failed to catch SIGHUP!\n");
ret = fill_cache(cache_size, malloc_and_init_memory, memflush, op,
resctrl_val);
if (ret) {
printf("\n Error in fill cache\n");
return -1;
}
return 0;
}
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