1 /* 2 * Copyright (C) 2014 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 #include <malloc.h> 18 #include <sys/param.h> 19 #include <unistd.h> 20 21 #include "jemalloc.h" 22 #include "private/bionic_macros.h" 23 24 void* je_pvalloc(size_t bytes) { 25 size_t pagesize = getpagesize(); 26 size_t size = __BIONIC_ALIGN(bytes, pagesize); 27 if (size < bytes) { 28 return NULL; 29 } 30 return je_memalign(pagesize, size); 31 } 32 33 #ifdef je_memalign 34 #undef je_memalign 35 #endif 36 37 // The man page for memalign says it fails if boundary is not a power of 2, 38 // but this is not true. Both glibc and dlmalloc round up to the next power 39 // of 2, so we'll do the same. 40 void* je_memalign_round_up_boundary(size_t boundary, size_t size) { 41 if (boundary != 0) { 42 if (!powerof2(boundary)) { 43 boundary = BIONIC_ROUND_UP_POWER_OF_2(boundary); 44 } 45 } else { 46 boundary = 1; 47 } 48 return je_memalign(boundary, size); 49 } 50 51 int je_mallopt(int param, int value) { 52 // The only parameter we currently understand is M_DECAY_TIME. 53 if (param == M_DECAY_TIME) { 54 // Only support setting the value to 1 or 0. 55 ssize_t decay_time; 56 if (value) { 57 decay_time = 1; 58 } else { 59 decay_time = 0; 60 } 61 // First get the total number of arenas. 62 unsigned narenas; 63 size_t sz = sizeof(unsigned); 64 if (je_mallctl("arenas.narenas", &narenas, &sz, nullptr, 0) != 0) { 65 return 0; 66 } 67 68 // Set the decay time for any arenas that will be created in the future. 69 if (je_mallctl("arenas.decay_time", nullptr, nullptr, &decay_time, sizeof(decay_time)) != 0) { 70 return 0; 71 } 72 73 // Change the decay on the already existing arenas. 74 char buffer[100]; 75 for (unsigned i = 0; i < narenas; i++) { 76 snprintf(buffer, sizeof(buffer), "arena.%d.decay_time", i); 77 if (je_mallctl(buffer, nullptr, nullptr, &decay_time, sizeof(decay_time)) != 0) { 78 break; 79 } 80 } 81 return 1; 82 } 83 return 0; 84 } 85
