| /** @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 "tscore/Diags.h" |
| #include "tscore/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() |
| { |
| #ifdef MAP_HUGETLB |
| return hugepage_size; |
| #else |
| Debug(DEBUG_TAG, "MAP_HUGETLB not defined"); |
| return 0; |
| #endif |
| } |
| |
| bool |
| ats_hugepage_enabled() |
| { |
| #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 == nullptr) { |
| 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(nullptr, 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 nullptr; |
| } |
| |
| Debug(DEBUG_TAG, "Request/Allocation (%zu/%zu) {%p}", s, size, mem); |
| return mem; |
| #else |
| (void)s; |
| Debug(DEBUG_TAG, "MAP_HUGETLB not defined"); |
| return nullptr; |
| #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 |
| } |