diff options
Diffstat (limited to 'lib/talloc')
| -rw-r--r-- | lib/talloc/ABI/pytalloc-util-2.0.8.sigs | 6 | ||||
| -rw-r--r-- | lib/talloc/ABI/talloc-2.0.8.sigs | 63 | ||||
| -rw-r--r-- | lib/talloc/talloc.c | 277 | ||||
| -rw-r--r-- | lib/talloc/talloc.h | 19 | ||||
| -rw-r--r-- | lib/talloc/wscript | 2 |
5 files changed, 327 insertions, 40 deletions
diff --git a/lib/talloc/ABI/pytalloc-util-2.0.8.sigs b/lib/talloc/ABI/pytalloc-util-2.0.8.sigs new file mode 100644 index 0000000000..961c1a84d0 --- /dev/null +++ b/lib/talloc/ABI/pytalloc-util-2.0.8.sigs @@ -0,0 +1,6 @@ +pytalloc_CObject_FromTallocPtr: PyObject *(void *) +pytalloc_Check: int (PyObject *) +pytalloc_GetObjectType: PyTypeObject *(void) +pytalloc_reference_ex: PyObject *(PyTypeObject *, TALLOC_CTX *, void *) +pytalloc_steal: PyObject *(PyTypeObject *, void *) +pytalloc_steal_ex: PyObject *(PyTypeObject *, TALLOC_CTX *, void *) diff --git a/lib/talloc/ABI/talloc-2.0.8.sigs b/lib/talloc/ABI/talloc-2.0.8.sigs new file mode 100644 index 0000000000..15a9e9554f --- /dev/null +++ b/lib/talloc/ABI/talloc-2.0.8.sigs @@ -0,0 +1,63 @@ +_talloc: void *(const void *, size_t) +_talloc_array: void *(const void *, size_t, unsigned int, const char *) +_talloc_free: int (void *, const char *) +_talloc_get_type_abort: void *(const void *, const char *, const char *) +_talloc_memdup: void *(const void *, const void *, size_t, const char *) +_talloc_move: void *(const void *, const void *) +_talloc_realloc: void *(const void *, void *, size_t, const char *) +_talloc_realloc_array: void *(const void *, void *, size_t, unsigned int, const char *) +_talloc_reference_loc: void *(const void *, const void *, const char *) +_talloc_set_destructor: void (const void *, int (*)(void *)) +_talloc_steal_loc: void *(const void *, const void *, const char *) +_talloc_zero: void *(const void *, size_t, const char *) +_talloc_zero_array: void *(const void *, size_t, unsigned int, const char *) +talloc_asprintf: char *(const void *, const char *, ...) +talloc_asprintf_append: char *(char *, const char *, ...) +talloc_asprintf_append_buffer: char *(char *, const char *, ...) +talloc_autofree_context: void *(void) +talloc_check_name: void *(const void *, const char *) +talloc_disable_null_tracking: void (void) +talloc_enable_leak_report: void (void) +talloc_enable_leak_report_full: void (void) +talloc_enable_null_tracking: void (void) +talloc_enable_null_tracking_no_autofree: void (void) +talloc_find_parent_byname: void *(const void *, const char *) +talloc_free_children: void (void *) +talloc_get_name: const char *(const void *) +talloc_get_size: size_t (const void *) +talloc_increase_ref_count: int (const void *) +talloc_init: void *(const char *, ...) +talloc_is_parent: int (const void *, const void *) +talloc_named: void *(const void *, size_t, const char *, ...) +talloc_named_const: void *(const void *, size_t, const char *) +talloc_parent: void *(const void *) +talloc_parent_name: const char *(const void *) +talloc_pool: void *(const void *, size_t) +talloc_realloc_fn: void *(const void *, void *, size_t) +talloc_reference_count: size_t (const void *) +talloc_reparent: void *(const void *, const void *, const void *) +talloc_report: void (const void *, FILE *) +talloc_report_depth_cb: void (const void *, int, int, void (*)(const void *, int, int, int, void *), void *) +talloc_report_depth_file: void (const void *, int, int, FILE *) +talloc_report_full: void (const void *, FILE *) +talloc_set_abort_fn: void (void (*)(const char *)) +talloc_set_log_fn: void (void (*)(const char *)) +talloc_set_log_stderr: void (void) +talloc_set_memlimit: int (const void *, size_t) +talloc_set_name: const char *(const void *, const char *, ...) +talloc_set_name_const: void (const void *, const char *) +talloc_show_parents: void (const void *, FILE *) +talloc_strdup: char *(const void *, const char *) +talloc_strdup_append: char *(char *, const char *) +talloc_strdup_append_buffer: char *(char *, const char *) +talloc_strndup: char *(const void *, const char *, size_t) +talloc_strndup_append: char *(char *, const char *, size_t) +talloc_strndup_append_buffer: char *(char *, const char *, size_t) +talloc_total_blocks: size_t (const void *) +talloc_total_size: size_t (const void *) +talloc_unlink: int (const void *, void *) +talloc_vasprintf: char *(const void *, const char *, va_list) +talloc_vasprintf_append: char *(char *, const char *, va_list) +talloc_vasprintf_append_buffer: char *(char *, const char *, va_list) +talloc_version_major: int (void) +talloc_version_minor: int (void) diff --git a/lib/talloc/talloc.c b/lib/talloc/talloc.c index 18ee548095..afc44b338f 100644 --- a/lib/talloc/talloc.c +++ b/lib/talloc/talloc.c @@ -71,6 +71,7 @@ #define TALLOC_FLAG_LOOP 0x02 #define TALLOC_FLAG_POOL 0x04 /* This is a talloc pool */ #define TALLOC_FLAG_POOLMEM 0x08 /* This is allocated in a pool */ + #define TALLOC_MAGIC_REFERENCE ((const char *)1) /* by default we abort when given a bad pointer (such as when talloc_free() is called @@ -221,12 +222,50 @@ static struct { TC_UNDEFINE_GROW_VALGRIND_CHUNK(_tc, _new_size); \ } while (0) +#define TALLOC_MEMLIMIT_CHECK(limit, size) do { \ + struct talloc_memlimit *l; \ + for (l = limit; l != NULL; l = l->upper) { \ + if (l->max_size != 0 && \ + ((l->max_size <= l->cur_size) || \ + (l->max_size - l->cur_size < TC_HDR_SIZE+size))) { \ + errno = ENOMEM; \ + return NULL; \ + } \ + } \ +} while(0) + +#define TALLOC_MEMLIMIT_UPDATE(limit, o_size, n_size) do { \ + struct talloc_memlimit *l; \ + ssize_t d; \ + if (o_size == 0) { \ + d = n_size + TC_HDR_SIZE; \ + } else { \ + d = n_size - o_size; \ + } \ + for (l = limit; l != NULL; l = l->upper) { \ + ssize_t new_size = l->cur_size + d; \ + if (new_size < 0) { \ + talloc_abort("cur_size memlimit counter not correct!"); \ + errno = EINVAL; \ + return NULL; \ + } \ + l->cur_size = new_size; \ + } \ +} while(0) + struct talloc_reference_handle { struct talloc_reference_handle *next, *prev; void *ptr; const char *location; }; +struct talloc_memlimit { + struct talloc_chunk *parent; + struct talloc_memlimit *upper; + size_t max_size; + size_t cur_size; +}; + typedef int (*talloc_destructor_t)(void *); struct talloc_chunk { @@ -239,6 +278,15 @@ struct talloc_chunk { unsigned flags; /* + * limit semantics: + * if 'limit' is set it means all *new* children of the context will + * be limited to a total aggregate size ox max_size for memory + * allocations. + * cur_size is used to kep track of the current use + */ + struct talloc_memlimit *limit; + + /* * "pool" has dual use: * * For the talloc pool itself (i.e. TALLOC_FLAG_POOL is set), "pool" @@ -543,6 +591,7 @@ static struct talloc_chunk *talloc_alloc_pool(struct talloc_chunk *parent, static inline void *__talloc(const void *context, size_t size) { struct talloc_chunk *tc = NULL; + struct talloc_memlimit *limit = NULL; if (unlikely(context == NULL)) { context = null_context; @@ -553,8 +602,15 @@ static inline void *__talloc(const void *context, size_t size) } if (context != NULL) { - tc = talloc_alloc_pool(talloc_chunk_from_ptr(context), - TC_HDR_SIZE+size); + struct talloc_chunk *ptc = talloc_chunk_from_ptr(context); + + if (ptc->limit != NULL) { + limit = ptc->limit; + } + + TALLOC_MEMLIMIT_CHECK(limit, (TC_HDR_SIZE+size)); + + tc = talloc_alloc_pool(ptc, TC_HDR_SIZE+size); } if (tc == NULL) { @@ -564,6 +620,15 @@ static inline void *__talloc(const void *context, size_t size) tc->pool = NULL; } + if (limit != NULL) { + struct talloc_memlimit *l; + + for (l = limit; l != NULL; l = l->upper) { + l->cur_size += TC_HDR_SIZE+size; + } + } + + tc->limit = limit; tc->size = size; tc->destructor = NULL; tc->child = NULL; @@ -852,6 +917,29 @@ static inline int _talloc_free_internal(void *ptr, const char *location) tc->flags |= TALLOC_FLAG_FREE; + /* + * If we are part of a memory limited context hierarchy + * we need to subtract the memory used from the counters + */ + if (tc->limit) { + struct talloc_memlimit *l; + + for (l = tc->limit; l != NULL; l = l->upper) { + if (l->cur_size >= tc->size+TC_HDR_SIZE) { + l->cur_size -= tc->size+TC_HDR_SIZE; + } else { + talloc_abort("cur_size memlimit counter not correct!"); + return 0; + } + } + + if (tc->limit->parent == tc) { + free(tc->limit); + } + + tc->limit = NULL; + } + /* we mark the freed memory with where we called the free * from. This means on a double free error we can report where * the first free came from @@ -880,6 +968,10 @@ static inline int _talloc_free_internal(void *ptr, const char *location) return 0; } +static size_t _talloc_total_limit_size(const void *ptr, + struct talloc_memlimit *old_limit, + struct talloc_memlimit *new_limit); + /* move a lump of memory from one talloc context to another return the ptr on success, or NULL if it could not be transferred. @@ -888,6 +980,7 @@ static inline int _talloc_free_internal(void *ptr, const char *location) static void *_talloc_steal_internal(const void *new_ctx, const void *ptr) { struct talloc_chunk *tc, *new_tc; + size_t ctx_size = 0; if (unlikely(!ptr)) { return NULL; @@ -899,6 +992,19 @@ static void *_talloc_steal_internal(const void *new_ctx, const void *ptr) tc = talloc_chunk_from_ptr(ptr); + if (tc->limit != NULL) { + + ctx_size = _talloc_total_limit_size(ptr, NULL, NULL); + + TALLOC_MEMLIMIT_UPDATE(tc->limit->upper, ctx_size, 0); + + if (tc->limit->parent == tc) { + tc->limit->upper = NULL; + } else { + tc->limit = NULL; + } + } + if (unlikely(new_ctx == NULL)) { if (tc->parent) { _TLIST_REMOVE(tc->parent->child, tc); @@ -909,7 +1015,7 @@ static void *_talloc_steal_internal(const void *new_ctx, const void *ptr) if (tc->prev) tc->prev->next = tc->next; if (tc->next) tc->next->prev = tc->prev; } - + tc->parent = tc->next = tc->prev = NULL; return discard_const_p(void, ptr); } @@ -935,6 +1041,19 @@ static void *_talloc_steal_internal(const void *new_ctx, const void *ptr) if (new_tc->child) new_tc->child->parent = NULL; _TLIST_ADD(new_tc->child, tc); + if (tc->limit || new_tc->limit) { + ctx_size = _talloc_total_limit_size(ptr, tc->limit, + new_tc->limit); + } + + if (new_tc->limit) { + struct talloc_memlimit *l; + + for (l = new_tc->limit; l != NULL; l = l->upper) { + l->cur_size += ctx_size; + } + } + return discard_const_p(void, ptr); } @@ -1068,7 +1187,7 @@ _PUBLIC_ int talloc_unlink(const void *context, void *ptr) if (tc_c != talloc_parent_chunk(ptr)) { return -1; } - + tc_p = talloc_chunk_from_ptr(ptr); if (tc_p->refs == NULL) { @@ -1411,6 +1530,10 @@ _PUBLIC_ void *_talloc_realloc(const void *context, void *ptr, size_t size, cons return NULL; } + if (tc->limit && (size - tc->size > 0)) { + TALLOC_MEMLIMIT_CHECK(tc->limit, (size - tc->size)); + } + /* handle realloc inside a talloc_pool */ if (unlikely(tc->flags & TALLOC_FLAG_POOLMEM)) { pool_tc = (union talloc_pool_chunk *)tc->pool; @@ -1418,7 +1541,7 @@ _PUBLIC_ void *_talloc_realloc(const void *context, void *ptr, size_t size, cons #if (ALWAYS_REALLOC == 0) /* don't shrink if we have less than 1k to gain */ - if (size < tc->size) { + if (size < tc->size && tc->limit == NULL) { if (pool_tc) { void *next_tc = tc_next_chunk(tc); TC_INVALIDATE_SHRINK_CHUNK(tc, size); @@ -1526,6 +1649,7 @@ _PUBLIC_ void *_talloc_realloc(const void *context, void *ptr, size_t size, cons if (new_chunk_size == old_chunk_size) { TC_UNDEFINE_GROW_CHUNK(tc, size); tc->flags &= ~TALLOC_FLAG_FREE; + TALLOC_MEMLIMIT_UPDATE(tc->limit, tc->size, size); tc->size = size; return ptr; } @@ -1541,6 +1665,7 @@ _PUBLIC_ void *_talloc_realloc(const void *context, void *ptr, size_t size, cons if (space_left >= space_needed) { TC_UNDEFINE_GROW_CHUNK(tc, size); tc->flags &= ~TALLOC_FLAG_FREE; + TALLOC_MEMLIMIT_UPDATE(tc->limit, tc->size, size); tc->size = size; pool_tc->hdr.c.pool = tc_next_chunk(tc); return ptr; @@ -1589,6 +1714,7 @@ got_new_ptr: tc->next->prev = tc; } + TALLOC_MEMLIMIT_UPDATE(tc->limit, tc->size, size); tc->size = size; _talloc_set_name_const(TC_PTR_FROM_CHUNK(tc), name); @@ -1607,10 +1733,16 @@ _PUBLIC_ void *_talloc_move(const void *new_ctx, const void *_pptr) return ret; } -/* - return the total size of a talloc pool (subtree) -*/ -_PUBLIC_ size_t talloc_total_size(const void *ptr) +enum talloc_mem_count_type { + TOTAL_MEM_SIZE, + TOTAL_MEM_BLOCKS, + TOTAL_MEM_LIMIT, +}; + +static size_t _talloc_total_mem_internal(const void *ptr, + enum talloc_mem_count_type type, + struct talloc_memlimit *old_limit, + struct talloc_memlimit *new_limit) { size_t total = 0; struct talloc_chunk *c, *tc; @@ -1624,17 +1756,50 @@ _PUBLIC_ size_t talloc_total_size(const void *ptr) tc = talloc_chunk_from_ptr(ptr); + if (old_limit || new_limit) { + if (tc->limit && tc->limit->upper == old_limit) { + tc->limit->upper = new_limit; + } + } + + /* optimize in the memlimits case */ + if (type == TOTAL_MEM_LIMIT && + tc->limit != NULL && + tc->limit != old_limit && + tc->limit->parent == tc) { + return tc->limit->cur_size; + } + if (tc->flags & TALLOC_FLAG_LOOP) { return 0; } tc->flags |= TALLOC_FLAG_LOOP; - if (likely(tc->name != TALLOC_MAGIC_REFERENCE)) { - total = tc->size; + if (old_limit || new_limit) { + if (old_limit == tc->limit) { + tc->limit = new_limit; + } } - for (c=tc->child;c;c=c->next) { - total += talloc_total_size(TC_PTR_FROM_CHUNK(c)); + + switch (type) { + case TOTAL_MEM_SIZE: + if (likely(tc->name != TALLOC_MAGIC_REFERENCE)) { + total = tc->size; + } + break; + case TOTAL_MEM_BLOCKS: + total++; + break; + case TOTAL_MEM_LIMIT: + if (likely(tc->name != TALLOC_MAGIC_REFERENCE)) { + total = tc->size + TC_HDR_SIZE; + } + break; + } + for (c = tc->child; c; c = c->next) { + total += _talloc_total_mem_internal(TC_PTR_FROM_CHUNK(c), type, + old_limit, new_limit); } tc->flags &= ~TALLOC_FLAG_LOOP; @@ -1643,36 +1808,19 @@ _PUBLIC_ size_t talloc_total_size(const void *ptr) } /* + return the total size of a talloc pool (subtree) +*/ +_PUBLIC_ size_t talloc_total_size(const void *ptr) +{ + return _talloc_total_mem_internal(ptr, TOTAL_MEM_SIZE, NULL, NULL); +} + +/* return the total number of blocks in a talloc pool (subtree) */ _PUBLIC_ size_t talloc_total_blocks(const void *ptr) { - size_t total = 0; - struct talloc_chunk *c, *tc; - - if (ptr == NULL) { - ptr = null_context; - } - if (ptr == NULL) { - return 0; - } - - tc = talloc_chunk_from_ptr(ptr); - - if (tc->flags & TALLOC_FLAG_LOOP) { - return 0; - } - - tc->flags |= TALLOC_FLAG_LOOP; - - total++; - for (c=tc->child;c;c=c->next) { - total += talloc_total_blocks(TC_PTR_FROM_CHUNK(c)); - } - - tc->flags &= ~TALLOC_FLAG_LOOP; - - return total; + return _talloc_total_mem_internal(ptr, TOTAL_MEM_BLOCKS, NULL, NULL); } /* @@ -1734,6 +1882,7 @@ _PUBLIC_ void talloc_report_depth_cb(const void *ptr, int depth, int max_depth, static void talloc_report_depth_FILE_helper(const void *ptr, int depth, int max_depth, int is_ref, void *_f) { const char *name = talloc_get_name(ptr); + struct talloc_chunk *tc; FILE *f = (FILE *)_f; if (is_ref) { @@ -1741,6 +1890,16 @@ static void talloc_report_depth_FILE_helper(const void *ptr, int depth, int max_ return; } + tc = talloc_chunk_from_ptr(ptr); + if (tc->limit && tc->limit->parent == tc) { + fprintf(f, "%*s%-30s is a memlimit context" + " (max_size = %lu bytes, cur_size = %lu bytes)\n", + depth*4, "", + name, + (unsigned long)tc->limit->max_size, + (unsigned long)tc->limit->cur_size); + } + if (depth == 0) { fprintf(f,"%stalloc report on '%s' (total %6lu bytes in %3lu blocks)\n", (max_depth < 0 ? "full " :""), name, @@ -2359,3 +2518,43 @@ _PUBLIC_ int talloc_is_parent(const void *context, const void *ptr) { return _talloc_is_parent(context, ptr, TALLOC_MAX_DEPTH); } + +/* + return the total size of memory used by this context and all children +*/ +static size_t _talloc_total_limit_size(const void *ptr, + struct talloc_memlimit *old_limit, + struct talloc_memlimit *new_limit) +{ + return _talloc_total_mem_internal(ptr, TOTAL_MEM_LIMIT, + old_limit, new_limit); +} + +_PUBLIC_ int talloc_set_memlimit(const void *ctx, size_t max_size) +{ + struct talloc_chunk *tc = talloc_chunk_from_ptr(ctx); + struct talloc_memlimit *orig_limit; + struct talloc_memlimit *limit = NULL; + + if (tc->limit && tc->limit->parent == tc) { + tc->limit->max_size = max_size; + return 0; + } + orig_limit = tc->limit; + + limit = malloc(sizeof(struct talloc_memlimit)); + if (limit == NULL) { + return 1; + } + limit->parent = tc; + limit->max_size = max_size; + limit->cur_size = _talloc_total_limit_size(ctx, tc->limit, limit); + + if (orig_limit) { + limit->upper = orig_limit; + } else { + limit->upper = NULL; + } + + return 0; +} diff --git a/lib/talloc/talloc.h b/lib/talloc/talloc.h index e48dc09a40..f3cbcd0e7c 100644 --- a/lib/talloc/talloc.h +++ b/lib/talloc/talloc.h @@ -1842,6 +1842,25 @@ void talloc_set_log_fn(void (*log_fn)(const char *message)); */ void talloc_set_log_stderr(void); +/** + * @brief Set a max memory limit for the current context hierarchy + * This affects all children of this context and constrain any + * allocation in the hierarchy to never exceed the limit set. + * The limit can be removed by setting 0 (unlimited) as the + * max_size by calling the funciton again on the sam context. + * Memory limits can also be nested, meaning a hild can have + * a stricter memory limit than a parent. + * Memory limits are enforced only at memory allocation time. + * Stealing a context into a 'limited' hierarchy properly + * updates memory usage but does *not* cause failure if the + * move causes the new parent to exceed its limits. However + * any further allocation on that hierarchy will then fail. + * + * @param[in] ctx The talloc context to set the limit on + * @param[in] max_size The (new) max_size + */ +int talloc_set_memlimit(const void *ctx, size_t max_size); + /* @} ******************************************************************/ #if TALLOC_DEPRECATED diff --git a/lib/talloc/wscript b/lib/talloc/wscript index 447406bf6e..8d3246b26b 100644 --- a/lib/talloc/wscript +++ b/lib/talloc/wscript @@ -1,7 +1,7 @@ #!/usr/bin/env python APPNAME = 'talloc' -VERSION = '2.0.7' +VERSION = '2.0.8' blddir = 'bin' |