a1c0d2fd4c
Add the mallopt function, and only a single option so far. Bug: 36401135 Test: Built and booted bullhead. Test: Ran jemalloc unit tests. Test: Ran bionic unit tests. Test: Ran a test that allocated and free'd a large piece of memory, Test: and verified that after changing the parameter, the PSS Test: sticks around (decay timer set to 1), the PSS is purged (decay Test: timer set to 0). Change-Id: I6927929b0c539c1023d34772d9e26bb6a8a45877
84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <malloc.h>
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#include <sys/param.h>
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#include <unistd.h>
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#include "jemalloc.h"
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#include "private/bionic_macros.h"
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void* je_pvalloc(size_t bytes) {
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size_t pagesize = getpagesize();
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size_t size = BIONIC_ALIGN(bytes, pagesize);
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if (size < bytes) {
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return NULL;
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}
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return je_memalign(pagesize, size);
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}
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#ifdef je_memalign
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#undef je_memalign
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#endif
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// The man page for memalign says it fails if boundary is not a power of 2,
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// but this is not true. Both glibc and dlmalloc round up to the next power
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// of 2, so we'll do the same.
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void* je_memalign_round_up_boundary(size_t boundary, size_t size) {
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if (boundary != 0) {
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if (!powerof2(boundary)) {
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boundary = BIONIC_ROUND_UP_POWER_OF_2(boundary);
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}
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} else {
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boundary = 1;
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}
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return je_memalign(boundary, size);
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}
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int je_mallopt(int param, int value) {
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// The only parameter we currently understand is M_DECAY_TIME.
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if (param == M_DECAY_TIME) {
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// Only support setting the value to 1 or 0.
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ssize_t decay_time;
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if (value) {
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decay_time = 1;
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} else {
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decay_time = 0;
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}
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// First get the total number of arenas.
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unsigned narenas;
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size_t sz = sizeof(unsigned);
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if (je_mallctl("arenas.narenas", &narenas, &sz, nullptr, 0) != 0) {
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return 0;
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}
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// Set the decay time for any arenas that will be created in the future.
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if (je_mallctl("arenas.decay_time", nullptr, nullptr, &decay_time, sizeof(decay_time)) != 0) {
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return 0;
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}
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// Change the decay on the already existing arenas.
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char buffer[100];
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for (unsigned i = 0; i < narenas; i++) {
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snprintf(buffer, sizeof(buffer), "arena.%d.decay_time", i);
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if (je_mallctl(buffer, nullptr, nullptr, &decay_time, sizeof(decay_time)) != 0) {
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break;
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}
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}
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return 1;
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}
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return 0;
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}
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