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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifdef MOZ_JEMALLOC4
#define MOZ_JEMALLOC_IMPL
/* mozmemory_wrap.h needs to be included before MFBT headers */
#include "mozmemory_wrap.h"
#include <mozilla/Assertions.h>
#include "mozilla/Types.h"
#if defined(MOZ_SYSTEM_JEMALLOC)
#include MALLOC_H
#else
#define DLLEXPORT
#include "jemalloc/jemalloc.h"
#endif
#ifdef XP_WIN
#include <windows.h>
#endif
#ifdef XP_DARWIN
#include <sys/mman.h>
#endif
/* Override some jemalloc defaults */
#ifdef DEBUG
#define MOZ_MALLOC_BUILD_OPTIONS ",junk:true"
#else
#define MOZ_MALLOC_BUILD_OPTIONS ",junk:free"
#endif
#define MOZ_MALLOC_OPTIONS "narenas:1,tcache:false"
MFBT_DATA const char* je_(malloc_conf) =
MOZ_MALLOC_OPTIONS MOZ_MALLOC_BUILD_OPTIONS;
#ifdef ANDROID
#include <android/log.h>
static void
_je_malloc_message(void* cbopaque, const char* s)
{
__android_log_print(ANDROID_LOG_INFO, "GeckoJemalloc", "%s", s);
}
void (*je_(malloc_message))(void*, const char* s) = _je_malloc_message;
#endif
/* Jemalloc supports hooks that are called on chunk
* allocate/deallocate/commit/decommit/purge/etc.
*
* We currently only hook commit, decommit and purge. We do this to tweak
* the way chunks are handled so that RSS stays lower than it normally
* would with the default jemalloc uses.
* This somewhat matches the behavior of mozjemalloc, except it doesn't
* rely on a double purge on mac, instead purging directly. (Yes, this
* means we can get rid of jemalloc_purge_freed_pages at some point)
*
* The default for jemalloc is to do the following:
* - commit, decommit: nothing
* - purge: MEM_RESET on Windows, MADV_FREE on Mac/BSD, MADV_DONTNEED on Linux
*
* The hooks we setup do the following:
* on Windows:
* - commit: MEM_COMMIT
* - decommit: MEM_DECOMMIT
* on Mac:
* - purge: mmap new anonymous memory on top of the chunk
*
* We only set the above hooks, others are left with the default.
*/
#if defined(XP_WIN) || defined(XP_DARWIN)
class JemallocInit {
public:
JemallocInit()
{
chunk_hooks_t hooks;
size_t hooks_len;
unsigned narenas;
size_t mib[3];
size_t size;
size = sizeof(narenas);
je_(mallctl)("arenas.narenas", &narenas, &size, nullptr, 0);
size = sizeof(mib) / sizeof(mib[0]);
je_(mallctlnametomib)("arena.0.chunk_hooks", mib, &size);
/* Set the hooks on all the existing arenas. */
for (unsigned arena = 0; arena < narenas; arena++) {
mib[1] = arena;
hooks_len = sizeof(hooks);
je_(mallctlbymib)(mib, size, &hooks, &hooks_len, nullptr, 0);
#ifdef XP_WIN
hooks.commit = CommitHook;
hooks.decommit = DecommitHook;
#endif
#ifdef XP_DARWIN
hooks.purge = PurgeHook;
#endif
je_(mallctlbymib)(mib, size, nullptr, nullptr, &hooks, hooks_len);
}
}
private:
#ifdef XP_WIN
static bool
CommitHook(void* chunk, size_t size, size_t offset, size_t length,
unsigned arena_ind)
{
void* addr = reinterpret_cast<void*>(
reinterpret_cast<uintptr_t>(chunk) + static_cast<uintptr_t>(offset));
if (!VirtualAlloc(addr, length, MEM_COMMIT, PAGE_READWRITE))
return true;
return false;
}
static bool
DecommitHook(void* chunk, size_t size, size_t offset, size_t length,
unsigned arena_ind)
{
void* addr = reinterpret_cast<void*>(
reinterpret_cast<uintptr_t>(chunk) + static_cast<uintptr_t>(offset));
if (!VirtualFree(addr, length, MEM_DECOMMIT))
MOZ_CRASH();
return false;
}
#endif
#ifdef XP_DARWIN
static bool
PurgeHook(void* chunk, size_t size, size_t offset, size_t length,
unsigned arena_ind)
{
void* addr = reinterpret_cast<void*>(
reinterpret_cast<uintptr_t>(chunk) + static_cast<uintptr_t>(offset));
void* new_addr = mmap(addr, length, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0);
return (new_addr != addr);
}
#endif
};
/* For the static constructor from the class above */
JemallocInit gJemallocInit;
#endif
#else
#include <mozilla/Assertions.h>
#endif /* MOZ_JEMALLOC4 */
/* Provide an abort function for use in jemalloc code */
extern "C" void moz_abort() {
MOZ_CRASH();
}
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