1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #pragma once
18
19 #include <stdint.h>
20 #include <time.h>
21
22 __attribute__((always_inline))
Nanotime()23 static uint64_t Nanotime() {
24 struct timespec t = {};
25 clock_gettime(CLOCK_MONOTONIC, &t);
26 return static_cast<uint64_t>(t.tv_sec) * 1000000000LL + t.tv_nsec;
27 }
28
29 __attribute__((always_inline))
MakeAllocationResident(void * ptr,size_t nbytes,int64_t present_bytes,int pagesize)30 static void MakeAllocationResident(void* ptr, size_t nbytes, int64_t present_bytes,
31 int pagesize) {
32 if (present_bytes != -1 && static_cast<size_t>(present_bytes) < nbytes) {
33 nbytes = present_bytes;
34 }
35
36 size_t start = 0;
37 uintptr_t page_aligned = reinterpret_cast<uintptr_t>(__builtin_align_up(ptr, pagesize));
38 uint8_t* data = reinterpret_cast<uint8_t*>(ptr);
39 if (page_aligned != reinterpret_cast<uintptr_t>(data)) {
40 // Make the first page of the allocation resident.
41 data[0] = 1;
42
43 // Skip to the start of the next page.
44 start = page_aligned - reinterpret_cast<uintptr_t>(ptr);
45 }
46 for (size_t i = start; i < nbytes; i += pagesize) {
47 data[i] = 1;
48 }
49 }
50