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/** @file
@section license License
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include <cstdio>
#include <sys/mman.h>
#include "ts/Diags.h"
#include "ts/ink_align.h"
#define DEBUG_TAG "hugepages"
#ifdef MAP_HUGETLB
#define MEMINFO_PATH "/proc/meminfo"
#define LINE_SIZE 256
#define TOKEN "Hugepagesize:"
#define TOKEN_SIZE (strlen(TOKEN))
static int hugepage_size = -1;
static bool hugepage_enabled;
#endif
size_t
ats_hugepage_size(void)
{
#ifdef MAP_HUGETLB
return hugepage_size;
#else
Debug(DEBUG_TAG, "MAP_HUGETLB not defined");
return 0;
#endif
}
bool
ats_hugepage_enabled(void)
{
#ifdef MAP_HUGETLB
return hugepage_enabled;
#else
return false;
#endif
}
void
ats_hugepage_init(int enabled)
{
#ifdef MAP_HUGETLB
FILE *fp;
char line[LINE_SIZE];
char *p, *ep;
hugepage_size = 0;
if (!enabled) {
Debug(DEBUG_TAG "_init", "hugepages not enabled");
return;
}
fp = fopen(MEMINFO_PATH, "r");
if (fp == NULL) {
Debug(DEBUG_TAG "_init", "Cannot open file %s", MEMINFO_PATH);
return;
}
while (fgets(line, sizeof(line), fp)) {
if (strncmp(line, TOKEN, TOKEN_SIZE) == 0) {
p = line + TOKEN_SIZE;
while (*p == ' ') {
p++;
}
hugepage_size = strtol(p, &ep, 10);
// What other values can this be?
if (strncmp(ep, " kB", 4)) {
hugepage_size *= 1024;
}
break;
}
}
fclose(fp);
if (hugepage_size) {
hugepage_enabled = true;
}
Debug(DEBUG_TAG "_init", "Hugepage size = %d", hugepage_size);
#else
Debug(DEBUG_TAG "_init", "MAP_HUGETLB not defined");
#endif
}
void *
ats_alloc_hugepage(size_t s)
{
#ifdef MAP_HUGETLB
size_t size;
void *mem;
size = INK_ALIGN(s, ats_hugepage_size());
mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB, -1, 0);
if (mem == MAP_FAILED) {
Debug(DEBUG_TAG, "Could not allocate hugepages size = %zu", size);
return NULL;
}
Debug(DEBUG_TAG, "Request/Allocation (%zu/%zu) {%p}", s, size, mem);
return mem;
#else
(void)s;
Debug(DEBUG_TAG, "MAP_HUGETLB not defined");
return NULL;
#endif
}
bool
ats_free_hugepage(void *ptr, size_t s)
{
#ifdef MAP_HUGETLB
size_t size;
size = INK_ALIGN(s, ats_hugepage_size());
return (munmap(ptr, size) == 0);
#else
(void)ptr;
(void)s;
Debug(DEBUG_TAG, "MAP_HUGETLB not defined");
return false;
#endif
}
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