ac578f2587
Add a new mallopt flag that purges any pending decaying pages.
Test: boots and works
bug 117795621
Change-Id: Ib250ae2b705b6a368c1efb801d6a7be54e075acb
(cherry pciekd from commit 5083e833a6)
96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
/*
|
|
* Copyright (C) 2014 The Android Open Source Project
|
|
*
|
|
* Licensed 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 <malloc.h>
|
|
#include <sys/param.h>
|
|
#include <unistd.h>
|
|
|
|
#include "jemalloc.h"
|
|
#include "private/bionic_macros.h"
|
|
|
|
void* je_pvalloc(size_t bytes) {
|
|
size_t pagesize = getpagesize();
|
|
size_t size = __BIONIC_ALIGN(bytes, pagesize);
|
|
if (size < bytes) {
|
|
return nullptr;
|
|
}
|
|
return je_memalign(pagesize, size);
|
|
}
|
|
|
|
#ifdef je_memalign
|
|
#undef je_memalign
|
|
#endif
|
|
|
|
// The man page for memalign says it fails if boundary is not a power of 2,
|
|
// but this is not true. Both glibc and dlmalloc round up to the next power
|
|
// of 2, so we'll do the same.
|
|
void* je_memalign_round_up_boundary(size_t boundary, size_t size) {
|
|
if (boundary != 0) {
|
|
if (!powerof2(boundary)) {
|
|
boundary = BIONIC_ROUND_UP_POWER_OF_2(boundary);
|
|
}
|
|
} else {
|
|
boundary = 1;
|
|
}
|
|
return je_memalign(boundary, size);
|
|
}
|
|
|
|
int je_mallopt(int param, int value) {
|
|
// The only parameter we currently understand is M_DECAY_TIME.
|
|
if (param == M_DECAY_TIME) {
|
|
// Only support setting the value to 1 or 0.
|
|
ssize_t decay_time;
|
|
if (value) {
|
|
decay_time = 1;
|
|
} else {
|
|
decay_time = 0;
|
|
}
|
|
// First get the total number of arenas.
|
|
unsigned narenas;
|
|
size_t sz = sizeof(unsigned);
|
|
if (je_mallctl("arenas.narenas", &narenas, &sz, nullptr, 0) != 0) {
|
|
return 0;
|
|
}
|
|
|
|
// Set the decay time for any arenas that will be created in the future.
|
|
if (je_mallctl("arenas.decay_time", nullptr, nullptr, &decay_time, sizeof(decay_time)) != 0) {
|
|
return 0;
|
|
}
|
|
|
|
// Change the decay on the already existing arenas.
|
|
char buffer[100];
|
|
for (unsigned i = 0; i < narenas; i++) {
|
|
snprintf(buffer, sizeof(buffer), "arena.%d.decay_time", i);
|
|
if (je_mallctl(buffer, nullptr, nullptr, &decay_time, sizeof(decay_time)) != 0) {
|
|
break;
|
|
}
|
|
}
|
|
return 1;
|
|
} else if (param == M_PURGE) {
|
|
unsigned narenas;
|
|
size_t sz = sizeof(unsigned);
|
|
if (je_mallctl("arenas.narenas", &narenas, &sz, nullptr, 0) != 0) {
|
|
return 0;
|
|
}
|
|
char buffer[100];
|
|
snprintf(buffer, sizeof(buffer), "arena.%u.purge", narenas);
|
|
if (je_mallctl(buffer, nullptr, nullptr, nullptr, 0) != 0) {
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|