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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2013-2018. All Rights Reserved.
*
* 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.
*
* %CopyrightEnd%
*/
#ifndef ERL_MMAP_H__
#define ERL_MMAP_H__
#include "sys.h"
#include "erl_printf.h"
#define ERTS_MMAP_SUPERALIGNED_BITS (18)
/* Affects hard limits for sbct and lmbcs documented in erts_alloc.xml */
#ifndef HAVE_MMAP
# define HAVE_MMAP 0
#endif
#ifndef HAVE_MREMAP
# define HAVE_MREMAP 0
#endif
#if HAVE_MMAP
# define ERTS_HAVE_OS_MMAP 1
# define ERTS_HAVE_GENUINE_OS_MMAP 1
# if HAVE_MREMAP
# define ERTS_HAVE_OS_MREMAP 1
# endif
/*
* MAP_NORESERVE is undefined in FreeBSD 10.x and later.
* This is to enable 64bit HiPE experimentally on FreeBSD.
* Note that on FreeBSD MAP_NORESERVE was "never implemented"
* even before 11.x (and the flag does not exist in /usr/src/sys/vm/mmap.c
* of 10.3-STABLE r301478 either), and HiPE was working on OTP 18.3.3,
* so mandating MAP_NORESERVE on FreeBSD might not be needed.
* See the following message on how MAP_NORESERVE was treated on FreeBSD:
* <http://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20150202/122958.html>
*/
# if defined(MAP_FIXED) && (defined(MAP_NORESERVE) || defined(__FreeBSD__))
# define ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION 1
# endif
#endif
#ifndef HAVE_VIRTUALALLOC
# define HAVE_VIRTUALALLOC 0
#endif
#if HAVE_VIRTUALALLOC
# define ERTS_HAVE_OS_MMAP 1
#endif
#ifdef ERTS_HAVE_GENUINE_OS_MMAP
# define HAVE_ERTS_MMAP 1
#else
# define HAVE_ERTS_MMAP 0
#endif
extern UWord erts_page_inv_mask;
typedef struct {
struct {
char *start;
char *end;
} virtual_range;
struct {
char *start;
char *end;
} predefined_area;
UWord scs; /* super carrier size */
int sco; /* super carrier only? */
UWord scrfsd; /* super carrier reserved free segment descriptors */
int scrpm; /* super carrier reserve physical memory */
}ErtsMMapInit;
#define ERTS_MMAP_INIT_DEFAULT_INITER \
{{NULL, NULL}, {NULL, NULL}, 0, 1, (1 << 16), 1}
#define ERTS_LITERAL_VIRTUAL_AREA_SIZE (UWORD_CONSTANT(1)*1024*1024*1024)
#define ERTS_MMAP_INIT_LITERAL_INITER \
{{NULL, NULL}, {NULL, NULL}, ERTS_LITERAL_VIRTUAL_AREA_SIZE, 1, (1 << 10), 0}
#define ERTS_SUPERALIGNED_SIZE \
(1 << ERTS_MMAP_SUPERALIGNED_BITS)
#define ERTS_INV_SUPERALIGNED_MASK \
((UWord) (ERTS_SUPERALIGNED_SIZE - 1))
#define ERTS_SUPERALIGNED_MASK \
(~ERTS_INV_SUPERALIGNED_MASK)
#define ERTS_SUPERALIGNED_FLOOR(X) \
(((UWord) (X)) & ERTS_SUPERALIGNED_MASK)
#define ERTS_SUPERALIGNED_CEILING(X) \
ERTS_SUPERALIGNED_FLOOR((X) + ERTS_INV_SUPERALIGNED_MASK)
#define ERTS_IS_SUPERALIGNED(X) \
(((UWord) (X) & ERTS_INV_SUPERALIGNED_MASK) == 0)
#define ERTS_INV_PAGEALIGNED_MASK \
(erts_page_inv_mask)
#define ERTS_PAGEALIGNED_MASK \
(~ERTS_INV_PAGEALIGNED_MASK)
#define ERTS_PAGEALIGNED_FLOOR(X) \
(((UWord) (X)) & ERTS_PAGEALIGNED_MASK)
#define ERTS_PAGEALIGNED_CEILING(X) \
ERTS_PAGEALIGNED_FLOOR((X) + ERTS_INV_PAGEALIGNED_MASK)
#define ERTS_IS_PAGEALIGNED(X) \
(((UWord) (X) & ERTS_INV_PAGEALIGNED_MASK) == 0)
#define ERTS_PAGEALIGNED_SIZE \
(ERTS_INV_PAGEALIGNED_MASK + 1)
struct process;
Eterm erts_mmap_debug_info(struct process*);
#if HAVE_ERTS_MMAP
typedef struct ErtsMemMapper_ ErtsMemMapper;
#define ERTS_MMAPFLG_OS_ONLY (((Uint32) 1) << 0)
#define ERTS_MMAPFLG_SUPERCARRIER_ONLY (((Uint32) 1) << 1)
#define ERTS_MMAPFLG_SUPERALIGNED (((Uint32) 1) << 2)
void *erts_mmap(ErtsMemMapper*, Uint32 flags, UWord *sizep);
void erts_munmap(ErtsMemMapper*, Uint32 flags, void *ptr, UWord size);
void *erts_mremap(ErtsMemMapper*, Uint32 flags, void *ptr, UWord old_size, UWord *sizep);
int erts_mmap_in_supercarrier(ErtsMemMapper*, void *ptr);
void erts_mmap_init(ErtsMemMapper*, ErtsMMapInit*);
struct erts_mmap_info_struct
{
UWord sizes[6];
UWord segs[6];
UWord os_used;
};
Eterm erts_mmap_info(ErtsMemMapper*, fmtfn_t *print_to_p, void *print_to_arg,
Eterm** hpp, Uint* szp, struct erts_mmap_info_struct*);
Eterm erts_mmap_info_options(ErtsMemMapper*,
char *prefix, fmtfn_t *print_to_p, void *print_to_arg,
Uint **hpp, Uint *szp);
#ifdef ERTS_WANT_MEM_MAPPERS
# include "erl_alloc_types.h"
extern ErtsMemMapper erts_dflt_mmapper;
# if defined(ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION)
# if defined(ARCH_64)
extern ErtsMemMapper erts_literal_mmapper;
# endif
# endif /* ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION */
#endif /* ERTS_WANT_MEM_MAPPERS */
/*#define HARD_DEBUG_MSEG*/
#ifdef HARD_DEBUG_MSEG
# define HARD_DBG_INSERT_MSEG hard_dbg_insert_mseg
# define HARD_DBG_REMOVE_MSEG hard_dbg_remove_mseg
void hard_dbg_insert_mseg(void* seg, UWord sz);
void hard_dbg_remove_mseg(void* seg, UWord sz);
#else
# define HARD_DBG_INSERT_MSEG(SEG,SZ)
# define HARD_DBG_REMOVE_MSEG(SEG,SZ)
#endif
#endif /* HAVE_ERTS_MMAP */
/* Marks the given memory region as unused without freeing it, letting the OS
* reclaim its physical memory with the promise that we'll get it back (without
* its contents) the next time it's accessed. */
ERTS_GLB_INLINE void erts_mem_discard(void *p, UWord size);
#if ERTS_GLB_INLINE_INCL_FUNC_DEF
#ifdef VALGRIND
#include <valgrind/memcheck.h>
ERTS_GLB_INLINE void erts_mem_discard(void *ptr, UWord size) {
VALGRIND_MAKE_MEM_UNDEFINED(ptr, size);
}
#elif defined(DEBUG)
/* Try to provoke crashes by filling the discard region with garbage. It's
* extremely hard to find bugs where we've discarded too much, as the
* region often retains its old contents if it's accessed before the OS
* reclaims it. */
ERTS_GLB_INLINE void erts_mem_discard(void *ptr, UWord size) {
static const char pattern[] = "DISCARDED";
char *data;
int i;
for(i = 0, data = ptr; i < size; i++) {
data[i] = pattern[i % sizeof(pattern)];
}
}
#elif defined(HAVE_SYS_MMAN_H)
#include <sys/mman.h>
ERTS_GLB_INLINE void erts_mem_discard(void *ptr, UWord size) {
#ifdef MADV_FREE
/* This is preferred as it doesn't necessarily free the pages right
* away, which is a bit faster than MADV_DONTNEED. */
madvise(ptr, size, MADV_FREE);
#else
madvise(ptr, size, MADV_DONTNEED);
#endif
}
#elif defined(_WIN32)
#include <winbase.h>
/* MEM_RESET is defined on all supported versions of Windows, and has the
* same semantics as MADV_FREE. */
ERTS_GLB_INLINE void erts_mem_discard(void *ptr, UWord size) {
VirtualAlloc(ptr, size, MEM_RESET, PAGE_READWRITE);
}
#else
/* Dummy implementation. */
ERTS_GLB_INLINE void erts_mem_discard(void *ptr, UWord size) {
(void)ptr;
(void)size;
}
#endif
#endif /* ERTS_GLB_INLINE_INCL_FUNC_DEF */
#endif /* ERL_MMAP_H__ */
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