/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2002-2013. 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_MSEG_H_
#define ERL_MSEG_H_
#include "sys.h"
#include "erl_alloc_types.h"
#include "erl_mmap.h"
/*
* We currently only enable mseg_alloc if we got
* a genuine mmap()/munmap() primitive. It is possible
* to utilize erts_mmap() withiout a mmap support but
* alloc_util needs to be prepared before we can do
* that.
*/
#ifdef ERTS_HAVE_GENUINE_OS_MMAP
# define HAVE_ERTS_MSEG 1
# define ERTS_HAVE_MSEG_SUPER_ALIGNED 1
#else
# define HAVE_ERTS_MSEG 0
# define ERTS_HAVE_MSEG_SUPER_ALIGNED 0
#endif
#if ERTS_HAVE_MSEG_SUPER_ALIGNED
# define MSEG_ALIGN_BITS ERTS_MMAP_SUPERALIGNED_BITS
#else
/* If we don't use super aligned multiblock carriers
* we will mmap with page size alignment (and thus use corresponding
* align bits).
*
* Current implementation needs this to be a constant and
* only uses this for user dev testing so setting page size
* to 4096 (12 bits) is fine.
*/
# define MSEG_ALIGN_BITS (12)
#endif
#if HAVE_ERTS_MSEG
#define MSEG_ALIGNED_SIZE (1 << MSEG_ALIGN_BITS)
#define ERTS_MSEG_FLG_NONE ((Uint)(0))
#define ERTS_MSEG_FLG_2POW ((Uint)(1 << 0))
#define ERTS_MSEG_VSN_STR "0.9"
typedef struct {
Uint amcbf;
Uint rmcbf;
Uint mcs;
Uint nos;
ErtsMMapInit mmap;
} ErtsMsegInit_t;
#define ERTS_MSEG_INIT_DEFAULT_INITIALIZER \
{ \
4*1024*1024, /* amcbf: Absolute max cache bad fit */ \
20, /* rmcbf: Relative max cache bad fit */ \
10, /* mcs: Max cache size */ \
1000, /* cci: Cache check interval */ \
ERTS_MMAP_INIT_DEFAULT_INITER \
}
typedef struct {
int cache;
int preserv;
UWord abs_shrink_th;
UWord rel_shrink_th;
int sched_spec;
#if HALFWORD_HEAP
int low_mem;
#endif
} ErtsMsegOpt_t;
extern const ErtsMsegOpt_t erts_mseg_default_opt;
void *erts_mseg_alloc(ErtsAlcType_t, UWord *, Uint);
void *erts_mseg_alloc_opt(ErtsAlcType_t, UWord *, Uint, const ErtsMsegOpt_t *);
void erts_mseg_dealloc(ErtsAlcType_t, void *, UWord, Uint);
void erts_mseg_dealloc_opt(ErtsAlcType_t, void *, UWord, Uint, const ErtsMsegOpt_t *);
void *erts_mseg_realloc(ErtsAlcType_t, void *, UWord, UWord *, Uint);
void *erts_mseg_realloc_opt(ErtsAlcType_t, void *, UWord, UWord *, Uint, const ErtsMsegOpt_t *);
void erts_mseg_clear_cache(void);
void erts_mseg_cache_check(void);
Uint erts_mseg_no( const ErtsMsegOpt_t *);
Uint erts_mseg_unit_size(void);
void erts_mseg_init(ErtsMsegInit_t *init);
void erts_mseg_late_init(void); /* Have to be called after all allocators,
threads and timers have been initialized. */
Eterm erts_mseg_info_options(int, int *, void*, Uint **, Uint *);
Eterm erts_mseg_info(int, int *, void*, int, Uint **, Uint *);
#endif /* #if HAVE_ERTS_MSEG */
UWord erts_mseg_test(UWord, UWord, UWord, UWord);
#endif /* #ifndef ERL_MSEG_H_ */
