/* * %CopyrightBegin% * * Copyright Ericsson AB 2002-2011. All Rights Reserved. * * The contents of this file are subject to the Erlang Public License, * Version 1.1, (the "License"); you may not use this file except in * compliance with the License. You should have received a copy of the * Erlang Public License along with this software. If not, it can be * retrieved online at http://www.erlang.org/. * * Software distributed under the License is distributed on an "AS IS" * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See * the License for the specific language governing rights and limitations * under the License. * * %CopyrightEnd% */ /* * Description: A memory segment allocator. Segments that are deallocated * are kept for a while in a segment "cache" before they are * destroyed. When segments are allocated, cached segments * are used if possible instead of creating new segments. * * Author: Rickard Green */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include "sys.h" #include "erl_mseg.h" #include "global.h" #include "erl_threads.h" #include "erl_mtrace.h" #include "erl_time.h" #include "erl_alloc.h" #include "big.h" #include "erl_thr_progress.h" #if HAVE_ERTS_MSEG #define SEGTYPE ERTS_MTRACE_SEGMENT_ID #ifndef HAVE_GETPAGESIZE #define HAVE_GETPAGESIZE 0 #endif #ifdef _SC_PAGESIZE # define GET_PAGE_SIZE sysconf(_SC_PAGESIZE) #elif HAVE_GETPAGESIZE # define GET_PAGE_SIZE getpagesize() #else # error "Page size unknown" /* Implement some other way to get the real page size if needed! */ #endif #undef MIN #define MIN(X, Y) ((X) < (Y) ? (X) : (Y)) #undef MAX #define MAX(X, Y) ((X) > (Y) ? (X) : (Y)) #define INV_ALIGNED_MASK ((UWord) ((MSEG_ALIGNED_SIZE) - 1)) #define ALIGNED_MASK (~INV_ALIGNED_MASK) #define ALIGNED_FLOOR(X) (((UWord)(X)) & ALIGNED_MASK) #define ALIGNED_CEILING(X) ALIGNED_FLOOR((X) + INV_ALIGNED_MASK) #define MAP_IS_ALIGNED(X) (((UWord)(X) & (MSEG_ALIGNED_SIZE - 1)) == 0) #define IS_2POW(X) (((X) & ((X) - 1)) == 0) static ERTS_INLINE Uint ceil_2pow(Uint x) { int i = 1 << (4 + (sizeof(Uint) != 4 ? 1 : 0)); x--; do { x |= x >> i; } while(i >>= 1); return x + 1; } static const int debruijn[32] = { 0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8, 31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9 }; #define LOG2(X) (debruijn[((Uint32)(((X) & -(X)) * 0x077CB531U)) >> 27]) #define CACHE_AREAS (32 - MSEG_ALIGN_BITS) #define SIZE_TO_CACHE_AREA_IDX(S) (LOG2((S)) - MSEG_ALIGN_BITS) #define MAX_CACHE_SIZE (30) #define MSEG_FLG_IS_2POW(X) ((X) & ERTS_MSEG_FLG_2POW) #ifdef DEBUG #define DBG(F,...) fprintf(stderr, (F), __VA_ARGS__ ) #else #define DBG(F,...) do{}while(0) #endif static int atoms_initialized; typedef struct mem_kind_t MemKind; #if HALFWORD_HEAP static int initialize_pmmap(void); static void *pmmap(size_t size); static int pmunmap(void *p, size_t size); static void *pmremap(void *old_address, size_t old_size, size_t new_size); #endif #if HAVE_MMAP /* Mmap ... */ #define MMAP_PROT (PROT_READ|PROT_WRITE) #ifdef MAP_ANON # define MMAP_FLAGS (MAP_ANON|MAP_PRIVATE) # define MMAP_FD (-1) #else # define MMAP_FLAGS (MAP_PRIVATE) # define MMAP_FD mmap_fd static int mmap_fd; #endif #if HAVE_MREMAP # define HAVE_MSEG_RECREATE 1 #else # define HAVE_MSEG_RECREATE 0 #endif #if HALFWORD_HEAP #define CAN_PARTLY_DESTROY 0 #else #define CAN_PARTLY_DESTROY 1 #endif #else /* #if HAVE_MMAP */ #define CAN_PARTLY_DESTROY 0 #error "Not supported" #endif /* #if HAVE_MMAP */ const ErtsMsegOpt_t erts_mseg_default_opt = { 1, /* Use cache */ 1, /* Preserv data */ 0, /* Absolute shrink threshold */ 0, /* Relative shrink threshold */ 0 /* Scheduler specific */ #if HALFWORD_HEAP ,0 /* need low memory */ #endif }; typedef struct { Uint32 giga_no; Uint32 no; } CallCounter; typedef struct { CallCounter alloc; CallCounter dealloc; CallCounter realloc; CallCounter create; CallCounter create_resize; CallCounter destroy; #if HAVE_MSEG_RECREATE CallCounter recreate; #endif CallCounter clear_cache; CallCounter check_cache; } ErtsMsegCalls; typedef struct cache_t_ cache_t; struct cache_t_ { Uint size; void *seg; cache_t *next; }; typedef struct ErtsMsegAllctr_t_ ErtsMsegAllctr_t; struct mem_kind_t { cache_t cache[MAX_CACHE_SIZE]; cache_t *cache_area[CACHE_AREAS]; cache_t *cache_free; Sint cache_size; Uint cache_hits; struct { struct { Uint watermark; Uint no; Uint sz; } current; struct { Uint no; Uint sz; } max; struct { Uint no; Uint sz; } max_ever; } segments; ErtsMsegAllctr_t *ma; const char* name; MemKind* next; };/*MemKind*/ struct ErtsMsegAllctr_t_ { int ix; int is_init_done; int is_thread_safe; erts_mtx_t mtx; int is_cache_check_scheduled; MemKind* mk_list; #if HALFWORD_HEAP MemKind low_mem; MemKind hi_mem; #else MemKind the_mem; #endif Uint max_cache_size; Uint abs_max_cache_bad_fit; Uint rel_max_cache_bad_fit; ErtsMsegCalls calls; #if CAN_PARTLY_DESTROY Uint min_seg_size; #endif }; typedef union { ErtsMsegAllctr_t mseg_alloc; char align__[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(ErtsMsegAllctr_t))]; } ErtsAlgndMsegAllctr_t; static int no_mseg_allocators; static ErtsAlgndMsegAllctr_t *aligned_mseg_allctr; #ifdef ERTS_SMP #define ERTS_MSEG_ALLCTR_IX(IX) \ (&aligned_mseg_allctr[(IX)].mseg_alloc) #define ERTS_MSEG_ALLCTR_SS() \ ERTS_MSEG_ALLCTR_IX((int) erts_get_scheduler_id()) #define ERTS_MSEG_ALLCTR_OPT(OPT) \ ((OPT)->sched_spec ? ERTS_MSEG_ALLCTR_SS() : ERTS_MSEG_ALLCTR_IX(0)) #else #define ERTS_MSEG_ALLCTR_IX(IX) \ (&aligned_mseg_allctr[0].mseg_alloc) #define ERTS_MSEG_ALLCTR_SS() \ (&aligned_mseg_allctr[0].mseg_alloc) #define ERTS_MSEG_ALLCTR_OPT(OPT) \ (&aligned_mseg_allctr[0].mseg_alloc) #endif #define ERTS_MSEG_LOCK(MA) \ do { \ if ((MA)->is_thread_safe) \ erts_mtx_lock(&(MA)->mtx); \ } while (0) #define ERTS_MSEG_UNLOCK(MA) \ do { \ if ((MA)->is_thread_safe) \ erts_mtx_unlock(&(MA)->mtx); \ } while (0) #define ERTS_MSEG_ALLOC_STAT(C,SZ) \ do { \ C->segments.current.no++; \ if (C->segments.max.no < C->segments.current.no) \ C->segments.max.no = C->segments.current.no; \ if (C->segments.current.watermark < C->segments.current.no) \ C->segments.current.watermark = C->segments.current.no; \ C->segments.current.sz += (SZ); \ if (C->segments.max.sz < C->segments.current.sz) \ C->segments.max.sz = C->segments.current.sz; \ } while (0) #define ERTS_MSEG_DEALLOC_STAT(C,SZ) \ do { \ ASSERT(C->segments.current.no > 0); \ C->segments.current.no--; \ ASSERT(C->segments.current.sz >= (SZ)); \ C->segments.current.sz -= (SZ); \ } while (0) #define ERTS_MSEG_REALLOC_STAT(C,OSZ, NSZ) \ do { \ ASSERT(C->segments.current.sz >= (OSZ)); \ C->segments.current.sz -= (OSZ); \ C->segments.current.sz += (NSZ); \ } while (0) #define ONE_GIGA (1000000000) #define ZERO_CC(MA, CC) ((MA)->calls.CC.no = 0, \ (MA)->calls.CC.giga_no = 0) #define INC_CC(MA, CC) ((MA)->calls.CC.no == ONE_GIGA - 1 \ ? ((MA)->calls.CC.giga_no++, \ (MA)->calls.CC.no = 0) \ : (MA)->calls.CC.no++) #define DEC_CC(MA, CC) ((MA)->calls.CC.no == 0 \ ? ((MA)->calls.CC.giga_no--, \ (MA)->calls.CC.no = ONE_GIGA - 1) \ : (MA)->calls.CC.no--) static erts_mtx_t init_atoms_mutex; /* Also needed when !USE_THREADS */ static ERTS_INLINE void schedule_cache_check(ErtsMsegAllctr_t *ma) { if (!ma->is_cache_check_scheduled && ma->is_init_done) { erts_set_aux_work_timeout(ma->ix, ERTS_SSI_AUX_WORK_MSEG_CACHE_CHECK, 1); ma->is_cache_check_scheduled = 1; } } /* remove ErtsMsegAllctr_t from arguments? * only used for statistics */ static ERTS_INLINE void * mmap_align(ErtsMsegAllctr_t *ma, void *addr, size_t length, int prot, int flags, int fd, off_t offset) { void *seg, *aseg; unsigned long diff; seg = mmap(addr, length, prot, flags, fd, offset); if (MAP_IS_ALIGNED(seg) || seg == MAP_FAILED) { return seg; } if (ma) INC_CC(ma, create_resize); munmap(seg, length); if ((seg = mmap(addr, length + MSEG_ALIGNED_SIZE, prot, flags, fd, offset)) == MAP_FAILED) { return seg; } /* ceil to aligned pointer */ aseg = (void *)(((unsigned long)(seg + MSEG_ALIGNED_SIZE)) & (~(MSEG_ALIGNED_SIZE - 1))); diff = aseg - seg; if (diff > 0) { munmap(seg, diff); } if (MSEG_ALIGNED_SIZE - diff > 0) { munmap((void *) (aseg + length), MSEG_ALIGNED_SIZE - diff); } return aseg; } static ERTS_INLINE void * mseg_create(ErtsMsegAllctr_t *ma, MemKind* mk, Uint size) { void *seg; ASSERT(size % MSEG_ALIGNED_SIZE == 0); #if HALFWORD_HEAP if (mk == &ma->low_mem) { seg = pmmap(size); if ((unsigned long) seg & CHECK_POINTER_MASK) { erts_fprintf(stderr,"Pointer mask failure (0x%08lx)\n",(unsigned long) seg); return NULL; } } else #endif { #if HAVE_MMAP { seg = (void *) mmap_align(ma, (void *) 0, (size_t) size, MMAP_PROT, MMAP_FLAGS, MMAP_FD, 0); if (seg == (void *) MAP_FAILED) seg = NULL; } #else # error "Missing mseg_create() implementation" #endif } INC_CC(ma, create); return seg; } static ERTS_INLINE void mseg_destroy(ErtsMsegAllctr_t *ma, MemKind* mk, void *seg, Uint size) { ERTS_DECLARE_DUMMY(int res); #if HALFWORD_HEAP if (mk == &ma->low_mem) { res = pmunmap((void *) seg, size); } else #endif { #ifdef HAVE_MMAP res = munmap((void *) seg, size); #else # error "Missing mseg_destroy() implementation" #endif } ASSERT(size % MSEG_ALIGNED_SIZE == 0); ASSERT(res == 0); INC_CC(ma, destroy); } #if HAVE_MSEG_RECREATE static ERTS_INLINE void * mseg_recreate(ErtsMsegAllctr_t *ma, MemKind* mk, void *old_seg, Uint old_size, Uint new_size) { void *new_seg; ASSERT(old_size % MSEG_ALIGNED_SIZE == 0); ASSERT(new_size % MSEG_ALIGNED_SIZE == 0); #if HALFWORD_HEAP if (mk == &ma->low_mem) { new_seg = (void *) pmremap((void *) old_seg, (size_t) old_size, (size_t) new_size); } else #endif { #if HAVE_MREMAP #if defined(__NetBSD__) new_seg = (void *) mremap((void *) old_seg, (size_t) old_size, NULL, (size_t) new_size, 0); #else new_seg = (void *) mremap((void *) old_seg, (size_t) old_size, (size_t) new_size, MREMAP_MAYMOVE); #endif if (new_seg == (void *) MAP_FAILED) new_seg = NULL; #else #error "Missing mseg_recreate() implementation" #endif } INC_CC(ma, recreate); return new_seg; } #endif /* #if HAVE_MSEG_RECREATE */ #ifdef DEBUG #define ERTS_DBG_MA_CHK_THR_ACCESS(MA) \ do { \ if ((MA)->is_thread_safe) \ ERTS_LC_ASSERT(erts_lc_mtx_is_locked(&(MA)->mtx) \ || erts_smp_thr_progress_is_blocking() \ || ERTS_IS_CRASH_DUMPING); \ else \ ERTS_LC_ASSERT((MA)->ix == (int) erts_get_scheduler_id() \ || erts_smp_thr_progress_is_blocking() \ || ERTS_IS_CRASH_DUMPING); \ } while (0) #define ERTS_DBG_MK_CHK_THR_ACCESS(MK) \ ERTS_DBG_MA_CHK_THR_ACCESS((MK)->ma) #else #define ERTS_DBG_MA_CHK_THR_ACCESS(MA) #define ERTS_DBG_MK_CHK_THR_ACCESS(MK) #endif /* NEW CACHE interface */ static ERTS_INLINE cache_t *mseg_cache_alloc_descriptor(MemKind *mk) { cache_t *c = mk->cache_free; ERTS_DBG_MK_CHK_THR_ACCESS(mk); if (c) mk->cache_free = c->next; return c; } static ERTS_INLINE void mseg_cache_free_descriptor(MemKind *mk, cache_t *c) { ERTS_DBG_MK_CHK_THR_ACCESS(mk); ASSERT(c); c->seg = NULL; c->size = 0; c->next = mk->cache_free; mk->cache_free = c; } static ERTS_INLINE int cache_bless_segment(MemKind *mk, void *seg, Uint size) { ERTS_DBG_MK_CHK_THR_ACCESS(mk); if IS_2POW(size) { int ix = SIZE_TO_CACHE_AREA_IDX(size); cache_t *c; if (ix < CACHE_AREAS && mk->cache_free) { ASSERT( (1 << (ix + MSEG_ALIGN_BITS)) == size); /* unlink from free cache list */ c = mseg_cache_alloc_descriptor(mk); /* link to cache area */ c->seg = seg; c->size = size; c->next = mk->cache_area[ix]; mk->cache_area[ix] = c; mk->cache_size++; return 1; } } return 0; } static ERTS_INLINE void *cache_get_segment(MemKind *mk, Uint size) { ERTS_DBG_MK_CHK_THR_ACCESS(mk); if (IS_2POW(size)) { int i, ix = SIZE_TO_CACHE_AREA_IDX(size); void *seg; cache_t *c; Uint csize; for( i = ix; i < CACHE_AREAS; i++) { if ((c = mk->cache_area[i]) == NULL) continue; ASSERT(IS_2POW(c->size)); /* unlink from cache area */ csize = c->size; seg = c->seg; c->next = NULL; mk->cache_area[i] = c->next; mk->cache_size--; mk->cache_hits++; /* link to free cache list */ mseg_cache_free_descriptor(mk, c); ASSERT(!(mk->cache_size < 0)); /* divvy up the cache - if needed */ while( i > ix) { csize = csize >> 1; /* try to cache half of it */ if (!cache_bless_segment(mk, (char *)seg + csize, csize)) { /* wouldn't cache .. destroy it instead */ mseg_destroy(mk->ma, mk, (char *)seg + csize, csize); } i--; } ASSERT(csize == size); return seg; } } return NULL; } /* *_mseg_check_*_cache * Slowly remove segments cached in the allocator by * using callbacks from aux-work in the scheduler. */ static ERTS_INLINE Uint mseg_drop_memkind_cache_size(MemKind *mk, int ix) { cache_t *c = NULL, *next = NULL; c = mk->cache_area[ix]; ASSERT( c != NULL ); while (c) { next = c->next; if (erts_mtrace_enabled) erts_mtrace_crr_free(SEGTYPE, SEGTYPE, c->seg); mseg_destroy(mk->ma, mk, c->seg, c->size); mseg_cache_free_descriptor(mk, c); mk->segments.current.watermark--; mk->cache_size--; c = next; } mk->cache_area[ix] = NULL; ASSERT( mk->cache_size >= 0 ); return mk->cache_size; } /* mseg_check_memkind_cache * - Check if we can empty some cached segments in this * MemKind. */ static Uint mseg_check_memkind_cache(MemKind *mk) { int i; /* remove biggest first (less likly to be reused) */ ERTS_DBG_MK_CHK_THR_ACCESS(mk); for (i = CACHE_AREAS - 1; i > 0; i--) { if (mk->cache_area[i] != NULL) return mseg_drop_memkind_cache_size(mk, i); } return 0; } /* mseg_cache_check * - Check if we have some cache we can purge * in any of the memkinds. */ static void mseg_cache_check(ErtsMsegAllctr_t *ma) { MemKind* mk; Uint empty_cache = 1; ERTS_MSEG_LOCK(ma); for (mk = ma->mk_list; mk; mk = mk->next) { if (mseg_check_memkind_cache(mk)) empty_cache = 0; } /* If all MemKinds caches are empty, * remove aux-work callback */ if (empty_cache) { ma->is_cache_check_scheduled = 0; erts_set_aux_work_timeout(ma->ix, ERTS_SSI_AUX_WORK_MSEG_CACHE_CHECK, 0); } INC_CC(ma, check_cache); ERTS_MSEG_UNLOCK(ma); } /* erts_mseg_cache_check * - This is a callback that is scheduled as aux-work from * schedulers and is called at some interval if we have a cache * on this mseg-allocator and memkind. * - Purpose: Empty cache slowly so we don't collect mapped areas * and bloat memory. */ void erts_mseg_cache_check(void) { mseg_cache_check(ERTS_MSEG_ALLCTR_SS()); } /* *_mseg_clear_*_cache * Remove cached segments from the allocator completely */ static void mseg_clear_memkind_cache(MemKind *mk) { int i; for (i = 0; i < CACHE_AREAS; i++) { if (mk->cache_area[i] == NULL) continue; mseg_drop_memkind_cache_size(mk, i); } } static void mseg_clear_cache(ErtsMsegAllctr_t *ma) { MemKind* mk; ERTS_MSEG_LOCK(ma); ERTS_DBG_MA_CHK_THR_ACCESS(ma); for (mk = ma->mk_list; mk; mk = mk->next) { mseg_clear_memkind_cache(mk); } INC_CC(ma, clear_cache); ERTS_MSEG_UNLOCK(ma); } void erts_mseg_clear_cache(void) { mseg_clear_cache(ERTS_MSEG_ALLCTR_SS()); mseg_clear_cache(ERTS_MSEG_ALLCTR_IX(0)); } static ERTS_INLINE MemKind* memkind(ErtsMsegAllctr_t *ma, const ErtsMsegOpt_t *opt) { #if HALFWORD_HEAP return opt->low_mem ? &ma->low_mem : &ma->hi_mem; #else return &ma->the_mem; #endif } static void * mseg_alloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, Uint *size_p, Uint flags, const ErtsMsegOpt_t *opt) { Uint size; void *seg; MemKind* mk = memkind(ma, opt); INC_CC(ma, alloc); /* Carrier align */ size = ALIGNED_CEILING(*size_p); /* Cache optim (if applicable) */ if (MSEG_FLG_IS_2POW(flags) && !IS_2POW(size)) size = ceil_2pow(size); #if CAN_PARTLY_DESTROY if (size < ma->min_seg_size) ma->min_seg_size = size; #endif if (opt->cache && mk->cache_size > 0 && (seg = cache_get_segment(mk, size)) != NULL) goto done; if ((seg = mseg_create(ma, mk, size)) == NULL) size = 0; done: *size_p = size; if (seg) { if (erts_mtrace_enabled) erts_mtrace_crr_alloc(seg, atype, ERTS_MTRACE_SEGMENT_ID, size); ERTS_MSEG_ALLOC_STAT(mk,size); } return seg; } static void mseg_dealloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg, Uint size, const ErtsMsegOpt_t *opt) { MemKind* mk = memkind(ma, opt); ERTS_MSEG_DEALLOC_STAT(mk,size); if (opt->cache && cache_bless_segment(mk, seg, size)) { schedule_cache_check(ma); goto done; } if (erts_mtrace_enabled) erts_mtrace_crr_free(atype, SEGTYPE, seg); mseg_destroy(ma, mk, seg, size); done: INC_CC(ma, dealloc); } static void * mseg_realloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg, Uint old_size, Uint *new_size_p, Uint flags, const ErtsMsegOpt_t *opt) { MemKind* mk; void *new_seg; Uint new_size; if (!seg || !old_size) { new_seg = mseg_alloc(ma, atype, new_size_p, flags, opt); DEC_CC(ma, alloc); return new_seg; } if (!(*new_size_p)) { mseg_dealloc(ma, atype, seg, old_size, opt); DEC_CC(ma, dealloc); return NULL; } mk = memkind(ma, opt); new_seg = seg; /* Carrier align */ new_size = ALIGNED_CEILING(*new_size_p); /* Cache optim (if applicable) */ if (MSEG_FLG_IS_2POW(flags) && !IS_2POW(new_size)) new_size = ceil_2pow(new_size); if (new_size == old_size) ; else if (new_size < old_size) { Uint shrink_sz = old_size - new_size; #if CAN_PARTLY_DESTROY if (new_size < ma->min_seg_size) ma->min_seg_size = new_size; #endif /* +Mrsbcst */ if (shrink_sz < opt->abs_shrink_th && 100*shrink_sz < opt->rel_shrink_th*old_size) { new_size = old_size; } else { #if CAN_PARTLY_DESTROY if (erts_mtrace_enabled) erts_mtrace_crr_realloc(new_seg, atype, SEGTYPE, seg, new_size); mseg_destroy(ma, mk, ((char *) seg) + new_size, shrink_sz); #elif HAVE_MSEG_RECREATE goto do_recreate; #else new_seg = mseg_alloc(ma, atype, &new_size, flags, opt); if (!new_seg) new_size = old_size; else { sys_memcpy(((char *) new_seg), ((char *) seg), MIN(new_size, old_size)); mseg_dealloc(ma, atype, seg, old_size, opt); } #endif } } else { if (!opt->preserv) { mseg_dealloc(ma, atype, seg, old_size, opt); new_seg = mseg_alloc(ma, atype, &new_size, flags, opt); } else { #if HAVE_MSEG_RECREATE #if !CAN_PARTLY_DESTROY do_recreate: #endif new_seg = mseg_recreate(ma, mk, (void *) seg, old_size, new_size); if (erts_mtrace_enabled) erts_mtrace_crr_realloc(new_seg, atype, SEGTYPE, seg, new_size); if (!new_seg) new_size = old_size; #else new_seg = mseg_alloc(ma, atype, &new_size, flags, opt); if (!new_seg) new_size = old_size; else { sys_memcpy(((char *) new_seg), ((char *) seg), MIN(new_size, old_size)); mseg_dealloc(ma, atype, seg, old_size, opt); } #endif } } INC_CC(ma, realloc); ASSERT(!MSEG_FLG_IS_2POW(flags) || IS_2POW(new_size)); *new_size_p = new_size; ERTS_MSEG_REALLOC_STAT(mk, old_size, new_size); return new_seg; } /* --- Info stuff ---------------------------------------------------------- */ static struct { Eterm version; Eterm options; Eterm amcbf; Eterm rmcbf; Eterm mcs; Eterm memkind; Eterm name; Eterm status; Eterm cached_segments; Eterm cache_hits; Eterm segments; Eterm segments_size; Eterm segments_watermark; Eterm calls; Eterm mseg_alloc; Eterm mseg_dealloc; Eterm mseg_realloc; Eterm mseg_create; Eterm mseg_create_resize; Eterm mseg_destroy; #if HAVE_MSEG_RECREATE Eterm mseg_recreate; #endif Eterm mseg_clear_cache; Eterm mseg_check_cache; #ifdef DEBUG Eterm end_of_atoms; #endif } am; static void ERTS_INLINE atom_init(Eterm *atom, char *name) { *atom = am_atom_put(name, strlen(name)); } #define AM_INIT(AM) atom_init(&am.AM, #AM) static void init_atoms(ErtsMsegAllctr_t *ma) { #ifdef DEBUG Eterm *atom; #endif ERTS_MSEG_UNLOCK(ma); erts_mtx_lock(&init_atoms_mutex); if (!atoms_initialized) { #ifdef DEBUG for (atom = (Eterm *) &am; atom <= &am.end_of_atoms; atom++) { *atom = THE_NON_VALUE; } #endif AM_INIT(version); AM_INIT(memkind); AM_INIT(name); AM_INIT(options); AM_INIT(amcbf); AM_INIT(rmcbf); AM_INIT(mcs); AM_INIT(status); AM_INIT(cached_segments); AM_INIT(cache_hits); AM_INIT(segments); AM_INIT(segments_size); AM_INIT(segments_watermark); AM_INIT(calls); AM_INIT(mseg_alloc); AM_INIT(mseg_dealloc); AM_INIT(mseg_realloc); AM_INIT(mseg_create); AM_INIT(mseg_create_resize); AM_INIT(mseg_destroy); #if HAVE_MSEG_RECREATE AM_INIT(mseg_recreate); #endif AM_INIT(mseg_clear_cache); AM_INIT(mseg_check_cache); #ifdef DEBUG for (atom = (Eterm *) &am; atom < &am.end_of_atoms; atom++) { ASSERT(*atom != THE_NON_VALUE); } #endif } ERTS_MSEG_LOCK(ma); atoms_initialized = 1; erts_mtx_unlock(&init_atoms_mutex); } #define bld_uint erts_bld_uint #define bld_cons erts_bld_cons #define bld_tuple erts_bld_tuple #define bld_string erts_bld_string #define bld_2tup_list erts_bld_2tup_list /* * bld_unstable_uint() (instead of bld_uint()) is used when values may * change between size check and actual build. This because a value * that would fit a small when size check is done may need to be built * as a big when the actual build is performed. Caller is required to * HRelease after build. */ static ERTS_INLINE Eterm bld_unstable_uint(Uint **hpp, Uint *szp, Uint ui) { Eterm res = THE_NON_VALUE; if (szp) *szp += BIG_UINT_HEAP_SIZE; if (hpp) { if (IS_USMALL(0, ui)) res = make_small(ui); else { res = uint_to_big(ui, *hpp); *hpp += BIG_UINT_HEAP_SIZE; } } return res; } static ERTS_INLINE void add_2tup(Uint **hpp, Uint *szp, Eterm *lp, Eterm el1, Eterm el2) { *lp = bld_cons(hpp, szp, bld_tuple(hpp, szp, 2, el1, el2), *lp); } static ERTS_INLINE void add_3tup(Uint **hpp, Uint *szp, Eterm *lp, Eterm el1, Eterm el2, Eterm el3) { *lp = bld_cons(hpp, szp, bld_tuple(hpp, szp, 3, el1, el2, el3), *lp); } static ERTS_INLINE void add_4tup(Uint **hpp, Uint *szp, Eterm *lp, Eterm el1, Eterm el2, Eterm el3, Eterm el4) { *lp = bld_cons(hpp, szp, bld_tuple(hpp, szp, 4, el1, el2, el3, el4), *lp); } static Eterm info_options(ErtsMsegAllctr_t *ma, char *prefix, int *print_to_p, void *print_to_arg, Uint **hpp, Uint *szp) { Eterm res = THE_NON_VALUE; if (print_to_p) { int to = *print_to_p; void *arg = print_to_arg; erts_print(to, arg, "%samcbf: %beu\n", prefix, ma->abs_max_cache_bad_fit); erts_print(to, arg, "%srmcbf: %beu\n", prefix, ma->rel_max_cache_bad_fit); erts_print(to, arg, "%smcs: %beu\n", prefix, ma->max_cache_size); } if (hpp || szp) { if (!atoms_initialized) init_atoms(ma); res = NIL; add_2tup(hpp, szp, &res, am.mcs, bld_uint(hpp, szp, ma->max_cache_size)); add_2tup(hpp, szp, &res, am.rmcbf, bld_uint(hpp, szp, ma->rel_max_cache_bad_fit)); add_2tup(hpp, szp, &res, am.amcbf, bld_uint(hpp, szp, ma->abs_max_cache_bad_fit)); } return res; } static Eterm info_calls(ErtsMsegAllctr_t *ma, int *print_to_p, void *print_to_arg, Uint **hpp, Uint *szp) { Eterm res = THE_NON_VALUE; if (print_to_p) { #define PRINT_CC(TO, TOA, CC) \ if (ma->calls.CC.giga_no == 0) \ erts_print(TO, TOA, "mseg_%s calls: %b32u\n", #CC, ma->calls.CC.no); \ else \ erts_print(TO, TOA, "mseg_%s calls: %b32u%09b32u\n", #CC, \ ma->calls.CC.giga_no, ma->calls.CC.no) int to = *print_to_p; void *arg = print_to_arg; PRINT_CC(to, arg, alloc); PRINT_CC(to, arg, dealloc); PRINT_CC(to, arg, realloc); PRINT_CC(to, arg, create); PRINT_CC(to, arg, create_resize); PRINT_CC(to, arg, destroy); #if HAVE_MSEG_RECREATE PRINT_CC(to, arg, recreate); #endif PRINT_CC(to, arg, clear_cache); PRINT_CC(to, arg, check_cache); #undef PRINT_CC } if (hpp || szp) { res = NIL; add_3tup(hpp, szp, &res, am.mseg_check_cache, bld_unstable_uint(hpp, szp, ma->calls.check_cache.giga_no), bld_unstable_uint(hpp, szp, ma->calls.check_cache.no)); add_3tup(hpp, szp, &res, am.mseg_clear_cache, bld_unstable_uint(hpp, szp, ma->calls.clear_cache.giga_no), bld_unstable_uint(hpp, szp, ma->calls.clear_cache.no)); #if HAVE_MSEG_RECREATE add_3tup(hpp, szp, &res, am.mseg_recreate, bld_unstable_uint(hpp, szp, ma->calls.recreate.giga_no), bld_unstable_uint(hpp, szp, ma->calls.recreate.no)); #endif add_3tup(hpp, szp, &res, am.mseg_destroy, bld_unstable_uint(hpp, szp, ma->calls.destroy.giga_no), bld_unstable_uint(hpp, szp, ma->calls.destroy.no)); add_3tup(hpp, szp, &res, am.mseg_create, bld_unstable_uint(hpp, szp, ma->calls.create.giga_no), bld_unstable_uint(hpp, szp, ma->calls.create.no)); add_3tup(hpp, szp, &res, am.mseg_create_resize, bld_unstable_uint(hpp, szp, ma->calls.create_resize.giga_no), bld_unstable_uint(hpp, szp, ma->calls.create_resize.no)); add_3tup(hpp, szp, &res, am.mseg_realloc, bld_unstable_uint(hpp, szp, ma->calls.realloc.giga_no), bld_unstable_uint(hpp, szp, ma->calls.realloc.no)); add_3tup(hpp, szp, &res, am.mseg_dealloc, bld_unstable_uint(hpp, szp, ma->calls.dealloc.giga_no), bld_unstable_uint(hpp, szp, ma->calls.dealloc.no)); add_3tup(hpp, szp, &res, am.mseg_alloc, bld_unstable_uint(hpp, szp, ma->calls.alloc.giga_no), bld_unstable_uint(hpp, szp, ma->calls.alloc.no)); } return res; } static Eterm info_status(ErtsMsegAllctr_t *ma, MemKind* mk, int *print_to_p, void *print_to_arg, int begin_new_max_period, Uint **hpp, Uint *szp) { Eterm res = THE_NON_VALUE; if (mk->segments.max_ever.no < mk->segments.max.no) mk->segments.max_ever.no = mk->segments.max.no; if (mk->segments.max_ever.sz < mk->segments.max.sz) mk->segments.max_ever.sz = mk->segments.max.sz; if (print_to_p) { int to = *print_to_p; void *arg = print_to_arg; erts_print(to, arg, "cached_segments: %beu\n", mk->cache_size); erts_print(to, arg, "cache_hits: %beu\n", mk->cache_hits); erts_print(to, arg, "segments: %beu %beu %beu\n", mk->segments.current.no, mk->segments.max.no, mk->segments.max_ever.no); erts_print(to, arg, "segments_size: %beu %beu %beu\n", mk->segments.current.sz, mk->segments.max.sz, mk->segments.max_ever.sz); erts_print(to, arg, "segments_watermark: %beu\n", mk->segments.current.watermark); } if (hpp || szp) { res = NIL; add_2tup(hpp, szp, &res, am.segments_watermark, bld_unstable_uint(hpp, szp, mk->segments.current.watermark)); add_4tup(hpp, szp, &res, am.segments_size, bld_unstable_uint(hpp, szp, mk->segments.current.sz), bld_unstable_uint(hpp, szp, mk->segments.max.sz), bld_unstable_uint(hpp, szp, mk->segments.max_ever.sz)); add_4tup(hpp, szp, &res, am.segments, bld_unstable_uint(hpp, szp, mk->segments.current.no), bld_unstable_uint(hpp, szp, mk->segments.max.no), bld_unstable_uint(hpp, szp, mk->segments.max_ever.no)); add_2tup(hpp, szp, &res, am.cache_hits, bld_unstable_uint(hpp, szp, mk->cache_hits)); add_2tup(hpp, szp, &res, am.cached_segments, bld_unstable_uint(hpp, szp, mk->cache_size)); } if (begin_new_max_period) { mk->segments.max.no = mk->segments.current.no; mk->segments.max.sz = mk->segments.current.sz; } return res; } static Eterm info_memkind(ErtsMsegAllctr_t *ma, MemKind* mk, int *print_to_p, void *print_to_arg, int begin_max_per, Uint **hpp, Uint *szp) { Eterm res = THE_NON_VALUE; Eterm atoms[3]; Eterm values[3]; if (print_to_p) { erts_print(*print_to_p, print_to_arg, "memory kind: %s\n", mk->name); } if (hpp || szp) { atoms[0] = am.name; atoms[1] = am.status; atoms[2] = am.calls; values[0] = erts_bld_string(hpp, szp, mk->name); } values[1] = info_status(ma, mk, print_to_p, print_to_arg, begin_max_per, hpp, szp); values[2] = info_calls(ma, print_to_p, print_to_arg, hpp, szp); if (hpp || szp) res = bld_2tup_list(hpp, szp, 3, atoms, values); return res; } static Eterm info_version(ErtsMsegAllctr_t *ma, int *print_to_p, void *print_to_arg, Uint **hpp, Uint *szp) { Eterm res = THE_NON_VALUE; if (print_to_p) { erts_print(*print_to_p, print_to_arg, "version: %s\n", ERTS_MSEG_VSN_STR); } if (hpp || szp) { res = bld_string(hpp, szp, ERTS_MSEG_VSN_STR); } return res; } /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\ * Exported functions * \* */ Eterm erts_mseg_info_options(int ix, int *print_to_p, void *print_to_arg, Uint **hpp, Uint *szp) { ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_IX(ix); Eterm res; ERTS_MSEG_LOCK(ma); ERTS_DBG_MA_CHK_THR_ACCESS(ma); res = info_options(ma, "option ", print_to_p, print_to_arg, hpp, szp); ERTS_MSEG_UNLOCK(ma); return res; } Eterm erts_mseg_info(int ix, int *print_to_p, void *print_to_arg, int begin_max_per, Uint **hpp, Uint *szp) { ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_IX(ix); Eterm res = THE_NON_VALUE; Eterm atoms[4]; Eterm values[4]; Uint n = 0; ERTS_MSEG_LOCK(ma); ERTS_DBG_MA_CHK_THR_ACCESS(ma); if (hpp || szp) { if (!atoms_initialized) init_atoms(ma); atoms[0] = am.version; atoms[1] = am.options; atoms[2] = am.memkind; atoms[3] = am.memkind; } values[n++] = info_version(ma, print_to_p, print_to_arg, hpp, szp); values[n++] = info_options(ma, "option ", print_to_p, print_to_arg, hpp, szp); #if HALFWORD_HEAP values[n++] = info_memkind(ma, &ma->low_mem, print_to_p, print_to_arg, begin_max_per, hpp, szp); values[n++] = info_memkind(ma, &ma->hi_mem, print_to_p, print_to_arg, begin_max_per, hpp, szp); #else values[n++] = info_memkind(ma, &ma->the_mem, print_to_p, print_to_arg, begin_max_per, hpp, szp); #endif if (hpp || szp) res = bld_2tup_list(hpp, szp, n, atoms, values); ERTS_MSEG_UNLOCK(ma); return res; } void * erts_mseg_alloc_opt(ErtsAlcType_t atype, Uint *size_p, Uint flags, const ErtsMsegOpt_t *opt) { ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_OPT(opt); void *seg; ERTS_MSEG_LOCK(ma); ERTS_DBG_MA_CHK_THR_ACCESS(ma); seg = mseg_alloc(ma, atype, size_p, flags, opt); ERTS_MSEG_UNLOCK(ma); return seg; } void * erts_mseg_alloc(ErtsAlcType_t atype, Uint *size_p, Uint flags) { return erts_mseg_alloc_opt(atype, size_p, flags, &erts_mseg_default_opt); } void erts_mseg_dealloc_opt(ErtsAlcType_t atype, void *seg, Uint size, const ErtsMsegOpt_t *opt) { ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_OPT(opt); ERTS_MSEG_LOCK(ma); ERTS_DBG_MA_CHK_THR_ACCESS(ma); mseg_dealloc(ma, atype, seg, size, opt); ERTS_MSEG_UNLOCK(ma); } void erts_mseg_dealloc(ErtsAlcType_t atype, void *seg, Uint size) { erts_mseg_dealloc_opt(atype, seg, size, &erts_mseg_default_opt); } void * erts_mseg_realloc_opt(ErtsAlcType_t atype, void *seg, Uint old_size, Uint *new_size_p, Uint flags, const ErtsMsegOpt_t *opt) { ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_OPT(opt); void *new_seg; ERTS_MSEG_LOCK(ma); ERTS_DBG_MA_CHK_THR_ACCESS(ma); new_seg = mseg_realloc(ma, atype, seg, old_size, new_size_p, flags, opt); ERTS_MSEG_UNLOCK(ma); return new_seg; } void * erts_mseg_realloc(ErtsAlcType_t atype, void *seg, Uint old_size, Uint *new_size_p, Uint flags) { return erts_mseg_realloc_opt(atype, seg, old_size, new_size_p, flags, &erts_mseg_default_opt); } Uint erts_mseg_no(const ErtsMsegOpt_t *opt) { ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_OPT(opt); MemKind* mk; Uint n = 0; ERTS_MSEG_LOCK(ma); ERTS_DBG_MA_CHK_THR_ACCESS(ma); for (mk=ma->mk_list; mk; mk=mk->next) { n += mk->segments.current.no; } ERTS_MSEG_UNLOCK(ma); return n; } Uint erts_mseg_unit_size(void) { return MSEG_ALIGNED_SIZE; } static void mem_kind_init(ErtsMsegAllctr_t *ma, MemKind* mk, const char* name) { int i; for (i = 0; i < CACHE_AREAS; i++) { mk->cache_area[i] = NULL; } mk->cache_free = NULL; for (i = 0; i < MAX_CACHE_SIZE; i++) { mk->cache[i].seg = NULL; mk->cache[i].size = 0; mk->cache[i].next = mk->cache_free; mk->cache_free = &(mk->cache[i]); } mk->cache_size = 0; mk->cache_hits = 0; mk->segments.current.watermark = 0; mk->segments.current.no = 0; mk->segments.current.sz = 0; mk->segments.max.no = 0; mk->segments.max.sz = 0; mk->segments.max_ever.no = 0; mk->segments.max_ever.sz = 0; mk->ma = ma; mk->name = name; mk->next = ma->mk_list; ma->mk_list = mk; } void erts_mseg_init(ErtsMsegInit_t *init) { int i; UWord x; #ifdef ERTS_SMP no_mseg_allocators = init->nos + 1; #else no_mseg_allocators = 1; #endif x = (UWord) malloc(sizeof(ErtsAlgndMsegAllctr_t) *no_mseg_allocators + (ERTS_CACHE_LINE_SIZE-1)); if (x & ERTS_CACHE_LINE_MASK) x = (x & ~ERTS_CACHE_LINE_MASK) + ERTS_CACHE_LINE_SIZE; ASSERT((x & ERTS_CACHE_LINE_MASK) == 0); aligned_mseg_allctr = (ErtsAlgndMsegAllctr_t *) x; atoms_initialized = 0; erts_mtx_init(&init_atoms_mutex, "mseg_init_atoms"); #if HAVE_MMAP && !defined(MAP_ANON) mmap_fd = open("/dev/zero", O_RDWR); if (mmap_fd < 0) erl_exit(ERTS_ABORT_EXIT, "erts_mseg: unable to open /dev/zero\n"); #endif #if HAVE_MMAP && HALFWORD_HEAP initialize_pmmap(); #endif if (!IS_2POW(GET_PAGE_SIZE)) erl_exit(ERTS_ABORT_EXIT, "erts_mseg: Unexpected page_size %beu\n", GET_PAGE_SIZE); ASSERT((MSEG_ALIGNED_SIZE % GET_PAGE_SIZE) == 0); for (i = 0; i < no_mseg_allocators; i++) { ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_IX(i); ma->ix = i; ma->is_init_done = 0; if (i != 0) ma->is_thread_safe = 0; else { ma->is_thread_safe = 1; erts_mtx_init(&ma->mtx, "mseg"); } ma->is_cache_check_scheduled = 0; /* Options ... */ ma->abs_max_cache_bad_fit = init->amcbf; ma->rel_max_cache_bad_fit = init->rmcbf; ma->max_cache_size = init->mcs; if (ma->max_cache_size > MAX_CACHE_SIZE) ma->max_cache_size = MAX_CACHE_SIZE; ma->mk_list = NULL; #if HALFWORD_HEAP mem_kind_init(ma, &ma->low_mem, "low memory"); mem_kind_init(ma, &ma->hi_mem, "high memory"); #else mem_kind_init(ma, &ma->the_mem, "all memory"); #endif sys_memzero((void *) &ma->calls, sizeof(ErtsMsegCalls)); #if CAN_PARTLY_DESTROY ma->min_seg_size = ~((Uint) 0); #endif } } static ERTS_INLINE Uint tot_cache_size(ErtsMsegAllctr_t *ma) { MemKind* mk; Uint sz = 0; ERTS_DBG_MA_CHK_THR_ACCESS(ma); for (mk=ma->mk_list; mk; mk=mk->next) { sz += mk->cache_size; } return sz; } /* * erts_mseg_late_init() have to be called after all allocators, * threads and timers have been initialized. */ void erts_mseg_late_init(void) { ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_SS(); ERTS_MSEG_LOCK(ma); ERTS_DBG_MA_CHK_THR_ACCESS(ma); ma->is_init_done = 1; if (tot_cache_size(ma)) schedule_cache_check(ma); ERTS_MSEG_UNLOCK(ma); } #endif /* #if HAVE_ERTS_MSEG */ unsigned long erts_mseg_test(unsigned long op, unsigned long a1, unsigned long a2, unsigned long a3) { switch (op) { #if HAVE_ERTS_MSEG case 0x400: /* Have erts_mseg */ return (unsigned long) 1; case 0x401: return (unsigned long) erts_mseg_alloc(ERTS_ALC_A_INVALID, (Uint *) a1, (Uint) 0); case 0x402: erts_mseg_dealloc(ERTS_ALC_A_INVALID, (void *) a1, (Uint) a2); return (unsigned long) 0; case 0x403: return (unsigned long) erts_mseg_realloc(ERTS_ALC_A_INVALID, (void *) a1, (Uint) a2, (Uint *) a3, (Uint) 0); case 0x404: erts_mseg_clear_cache(); return (unsigned long) 0; case 0x405: return (unsigned long) erts_mseg_no(&erts_mseg_default_opt); case 0x406: { ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_IX(0); unsigned long res; ERTS_MSEG_LOCK(ma); res = (unsigned long) tot_cache_size(ma); ERTS_MSEG_UNLOCK(ma); return res; } #else /* #if HAVE_ERTS_MSEG */ case 0x400: /* Have erts_mseg */ return (unsigned long) 0; #endif /* #if HAVE_ERTS_MSEG */ default: ASSERT(0); return ~((unsigned long) 0); } } #if HALFWORD_HEAP /* * Very simple page oriented mmap replacer. Works in the lower * 32 bit address range of a 64bit program. * Implements anonymous mmap mremap and munmap with address order first fit. * The free list is expected to be very short... * To be used for compressed pointers in Erlang halfword emulator * implementation. The MacOS X version is more of a toy, it's not really * for production as the halfword erlang VM relies on Linux specific memory * mapping tricks. */ /* #define HARDDEBUG 1 */ #ifdef HARDDEBUG static void dump_freelist(void) { FreeBlock *p = first; while (p) { fprintf(stderr, "p = %p\r\np->num = %ld\r\np->next = %p\r\n\r\n", (void *) p, (unsigned long) p->num, (void *) p->next); p = p->next; } } #define HARDDEBUG_HW_INCOMPLETE_ALIGNMENT(PTR, SZ) \ fprintf(stderr,"Mapping of address %p with size %ld " \ "does not map complete pages (%s:%d)\r\n", \ (void *) (PTR), (unsigned long) (SZ),__FILE__, __LINE__) #define HARDDEBUG_HW_UNALIGNED_ALIGNMENT(PTR, SZ) \ fprintf(stderr,"Mapping of address %p with size %ld " \ "is not page aligned (%s:%d)\r\n", \ (void *) (PTR), (unsigned long) (SZ),__FILE__, __LINE__) #define HARDDEBUG_MAP_FAILED(PTR, SZ) \ fprintf(stderr, "Could not actually map memory " \ "at address %p with size %ld (%s:%d) ..\r\n", \ (void *) (PTR), (unsigned long) (SZ),__FILE__, __LINE__) #else #define HARDDEBUG_HW_INCOMPLETE_ALIGNMENT(PTR, SZ) do{}while(0) #define HARDDEBUG_HW_UNALIGNED_ALIGNMENT(PTR, SZ) do{}while(0) #define HARDDEBUG_MAP_FAILED(PTR, SZ) do{}while(0) #endif #ifdef __APPLE__ #define MAP_ANONYMOUS MAP_ANON #endif #define INIT_LOCK() do {erts_mtx_init(&pmmap_mutex, "pmmap");} while(0) #define TAKE_LOCK() do {erts_mtx_lock(&pmmap_mutex);} while(0) #define RELEASE_LOCK() do {erts_mtx_unlock(&pmmap_mutex);} while(0) static erts_mtx_t pmmap_mutex; /* Also needed when !USE_THREADS */ typedef struct _free_block { unsigned long num; /*pages*/ struct _free_block *next; } FreeBlock; /* Protect with lock */ static FreeBlock *first; static void *do_map(void *ptr, size_t sz) { void *res; if (ALIGNED_CEILING(sz) != sz) { HARDDEBUG_HW_INCOMPLETE_ALIGNMENT(ptr, sz); return NULL; } if (((unsigned long) ptr) % MSEG_ALIGNED_SIZE) { HARDDEBUG_HW_UNALIGNED_ALIGNMENT(ptr, sz); return NULL; } #if HAVE_MMAP res = mmap(ptr, sz, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1 , 0); #else # error "Missing mmap support" #endif if (res == MAP_FAILED) { HARDDEBUG_MAP_FAILED(ptr, sz); return NULL; } return res; } static int do_unmap(void *ptr, size_t sz) { void *res; if (ALIGNED_CEILING(sz) != sz) { HARDDEBUG_HW_INCOMPLETE_ALIGNMENT(ptr, sz); return 1; } if (((unsigned long) ptr) % MSEG_ALIGNED_SIZE) { HARDDEBUG_HW_UNALIGNED_ALIGNMENT(ptr, sz); return 1; } res = mmap(ptr, sz, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_FIXED, -1 , 0); if (res == MAP_FAILED) { HARDDEBUG_MAP_FAILED(ptr, sz); return 1; } return 0; } #ifdef __APPLE__ /* * The first 4 gig's are protected on Macos X for 64bit processes :( * The range 0x1000000000 - 0x10FFFFFFFF is selected as an arbitrary * value of a normally unused range... Real MMAP's will avoid * it and all 32bit compressed pointers can be in that range... * More expensive than on Linux where expansion of compressed * poiters involves no masking (as they are in the first 4 gig's). * It's also very uncertain if the MAP_NORESERVE flag really has * any effect in MacOS X. Swap space may always be allocated... */ #define SET_RANGE_MIN() /* nothing */ #define RANGE_MIN 0x1000000000UL #define RANGE_MAX 0x1100000000UL #define RANGE_MASK (RANGE_MIN) #define EXTRA_MAP_FLAGS (MAP_FIXED) #else static size_t range_min; #define SET_RANGE_MIN() do { range_min = (size_t) sbrk(0); } while (0) #define RANGE_MIN range_min #define RANGE_MAX 0x100000000UL #define RANGE_MASK 0UL #define EXTRA_MAP_FLAGS (0) #endif static int initialize_pmmap(void) { char *p,*q,*rptr; size_t rsz; FreeBlock *initial; SET_RANGE_MIN(); if (sizeof(void *) != 8) { erl_exit(1,"Halfword emulator cannot be run in 32bit mode"); } p = (char *) RANGE_MIN; q = (char *) RANGE_MAX; rsz = ALIGNED_FLOOR(q - p); rptr = mmap_align(NULL, (void *) p, rsz, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | EXTRA_MAP_FLAGS, -1 , 0); #ifdef HARDDEBUG printf("p=%p, rsz = %ld, pages = %ld, got range = %p -> %p\r\n", p, (unsigned long) rsz, (unsigned long) (rsz / MSEG_ALIGNED_SIZE), (void *) rptr, (void*)(rptr + rsz)); #endif if ((UWord)(rptr + rsz) > RANGE_MAX) { size_t rsz_trunc = RANGE_MAX - (UWord)rptr; #ifdef HARDDEBUG printf("Reducing mmap'ed memory from %lu to %lu Mb, reduced range = %p -> %p\r\n", rsz/(1024*1024), rsz_trunc/(1024*1024), rptr, rptr+rsz_trunc); #endif munmap((void*)RANGE_MAX, rsz - rsz_trunc); rsz = rsz_trunc; } if (!do_map(rptr, MSEG_ALIGNED_SIZE)) { erl_exit(1,"Could not actually mmap first page for halfword emulator...\n"); } initial = (FreeBlock *) rptr; initial->num = (rsz / MSEG_ALIGNED_SIZE); initial->next = NULL; first = initial; INIT_LOCK(); return 0; } static void *pmmap(size_t size) { size_t real_size = ALIGNED_CEILING(size); size_t num_pages = real_size / MSEG_ALIGNED_SIZE; FreeBlock **block; FreeBlock *tail; FreeBlock *res; TAKE_LOCK(); for (block = &first; *block != NULL && (*block)->num < num_pages; block = &((*block)->next)) ; if (!(*block)) { RELEASE_LOCK(); return NULL; } if ((*block)->num == num_pages) { /* nice, perfect fit */ res = *block; *block = (*block)->next; } else { tail = (FreeBlock *) (((char *) ((void *) (*block))) + real_size); if (!do_map(tail, MSEG_ALIGNED_SIZE)) { HARDDEBUG_MAP_FAILED(tail, MSEG_ALIGNED_SIZE); RELEASE_LOCK(); return NULL; } tail->num = (*block)->num - num_pages; tail->next = (*block)->next; res = *block; *block = tail; } RELEASE_LOCK(); if (!do_map(res, real_size)) { HARDDEBUG_MAP_FAILED(res, real_size); return NULL; } return (void *) res; } static int pmunmap(void *p, size_t size) { size_t real_size = ALIGNED_CEILING(size); size_t num_pages = real_size / MSEG_ALIGNED_SIZE; FreeBlock *block; FreeBlock *last; FreeBlock *nb = (FreeBlock *) p; ASSERT(((unsigned long)p & CHECK_POINTER_MASK)==0); if (real_size > MSEG_ALIGNED_SIZE) { if (do_unmap(((char *) p) + MSEG_ALIGNED_SIZE, real_size - MSEG_ALIGNED_SIZE)) { return 1; } } TAKE_LOCK(); last = NULL; block = first; while(block != NULL && ((void *) block) < p) { last = block; block = block->next; } if (block != NULL && ((void *) block) == ((void *) (((char *) p) + real_size))) { /* Merge new free block with following */ nb->num = block->num + num_pages; nb->next = block->next; if (do_unmap(block, MSEG_ALIGNED_SIZE)) { RELEASE_LOCK(); return 1; } } else { /* just link in */ nb->num = num_pages; nb->next = block; } if (last != NULL) { if (p == ((void *) (((char *) last) + (last->num * MSEG_ALIGNED_SIZE)))) { /* Merge with previous */ last->num += nb->num; last->next = nb->next; if (do_unmap(nb, MSEG_ALIGNED_SIZE)) { RELEASE_LOCK(); return 1; } } else { last->next = nb; } } else { first = nb; } RELEASE_LOCK(); return 0; } static void *pmremap(void *old_address, size_t old_size, size_t new_size) { size_t new_real_size = ALIGNED_CEILING(new_size); size_t new_num_pages = new_real_size / MSEG_ALIGNED_SIZE; size_t old_real_size = ALIGNED_CEILING(old_size); size_t old_num_pages = old_real_size / MSEG_ALIGNED_SIZE; if (new_num_pages == old_num_pages) { return old_address; } else if (new_num_pages < old_num_pages) { /* Shrink */ size_t nfb_pages = old_num_pages - new_num_pages; size_t nfb_real_size = old_real_size - new_real_size; void *vnfb = (void *) (((char *)old_address) + new_real_size); FreeBlock *nfb = (FreeBlock *) vnfb; FreeBlock **block; TAKE_LOCK(); for (block = &first; *block != NULL && (*block) < nfb; block = &((*block)->next)) ; if (!(*block) || (*block) > ((FreeBlock *)(((char *) vnfb) + nfb_real_size))) { /* Normal link in */ if (nfb_pages > 1) { if (do_unmap((void *)(((char *) vnfb) + MSEG_ALIGNED_SIZE), (nfb_pages - 1)*MSEG_ALIGNED_SIZE)) { return NULL; } } nfb->next = (*block); nfb->num = nfb_pages; (*block) = nfb; } else { /* block merge */ nfb->next = (*block)->next; nfb->num = nfb_pages + (*block)->num; /* unmap also the first page of the next freeblock */ (*block) = nfb; if (do_unmap((void *)(((char *) vnfb) + MSEG_ALIGNED_SIZE), nfb_pages*MSEG_ALIGNED_SIZE)) { return NULL; } } RELEASE_LOCK(); return old_address; } else { /* Enlarge */ FreeBlock **block; void *old_end = (void *) (((char *)old_address) + old_real_size); TAKE_LOCK(); for (block = &first; *block != NULL && (*block) < (FreeBlock *) old_address; block = &((*block)->next)) ; if ((*block) == NULL || old_end > ((void *) RANGE_MAX) || (*block) != old_end || (*block)->num < (new_num_pages - old_num_pages)) { /* cannot extend */ void *result; RELEASE_LOCK(); result = pmmap(new_size); if (result == NULL) { return NULL; } memcpy(result,old_address,old_size); if (pmunmap(old_address,old_size)) { /* Oups... */ pmunmap(result,new_size); return NULL; } return result; } else { /* extend */ size_t remaining_pages = (*block)->num - (new_num_pages - old_num_pages); if (!remaining_pages) { void *p = (void *) (((char *) (*block)) + MSEG_ALIGNED_SIZE); void *n = (*block)->next; size_t x = ((*block)->num - 1) * MSEG_ALIGNED_SIZE; if (x > 0) { if (do_map(p,x) == NULL) { RELEASE_LOCK(); return NULL; } } (*block) = n; } else { FreeBlock *nfb = (FreeBlock *) ((void *) (((char *) old_address) + new_real_size)); void *p = (void *) (((char *) (*block)) + MSEG_ALIGNED_SIZE); if (do_map(p,new_real_size - old_real_size) == NULL) { RELEASE_LOCK(); return NULL; } nfb->num = remaining_pages; nfb->next = (*block)->next; (*block) = nfb; } RELEASE_LOCK(); return old_address; } } } #endif /* HALFWORD_HEAP */