* This fulfills the indicated allocation request out of the given extent (which * the caller should have ensured was big enough). If there's any unused space * before or after the resulting allocation, that space is given its own extent * and put back into extents. */
| 1054 | * and put back into extents. |
| 1055 | */ |
| 1056 | static extent_t * |
| 1057 | extent_recycle_split(tsdn_t *tsdn, arena_t *arena, |
| 1058 | extent_hooks_t **r_extent_hooks, rtree_ctx_t *rtree_ctx, extents_t *extents, |
| 1059 | void *new_addr, size_t size, size_t pad, size_t alignment, bool slab, |
| 1060 | szind_t szind, extent_t *extent, bool growing_retained) { |
| 1061 | extent_t *lead; |
| 1062 | extent_t *trail; |
| 1063 | extent_t *to_leak; |
| 1064 | extent_t *to_salvage; |
| 1065 | |
| 1066 | extent_split_interior_result_t result = extent_split_interior( |
| 1067 | tsdn, arena, r_extent_hooks, rtree_ctx, &extent, &lead, &trail, |
| 1068 | &to_leak, &to_salvage, new_addr, size, pad, alignment, slab, szind, |
| 1069 | growing_retained); |
| 1070 | |
| 1071 | if (!maps_coalesce && result != extent_split_interior_ok |
| 1072 | && !opt_retain) { |
| 1073 | /* |
| 1074 | * Split isn't supported (implies Windows w/o retain). Avoid |
| 1075 | * leaking the extents. |
| 1076 | */ |
| 1077 | assert(to_leak != NULL && lead == NULL && trail == NULL); |
| 1078 | extent_deactivate(tsdn, arena, extents, to_leak); |
| 1079 | return NULL; |
| 1080 | } |
| 1081 | |
| 1082 | if (result == extent_split_interior_ok) { |
| 1083 | if (lead != NULL) { |
| 1084 | extent_deactivate(tsdn, arena, extents, lead); |
| 1085 | } |
| 1086 | if (trail != NULL) { |
| 1087 | extent_deactivate(tsdn, arena, extents, trail); |
| 1088 | } |
| 1089 | return extent; |
| 1090 | } else { |
| 1091 | /* |
| 1092 | * We should have picked an extent that was large enough to |
| 1093 | * fulfill our allocation request. |
| 1094 | */ |
| 1095 | assert(result == extent_split_interior_error); |
| 1096 | if (to_salvage != NULL) { |
| 1097 | extent_deregister(tsdn, to_salvage); |
| 1098 | } |
| 1099 | if (to_leak != NULL) { |
| 1100 | void *leak = extent_base_get(to_leak); |
| 1101 | extent_deregister_no_gdump_sub(tsdn, to_leak); |
| 1102 | extents_abandon_vm(tsdn, arena, r_extent_hooks, extents, |
| 1103 | to_leak, growing_retained); |
| 1104 | assert(extent_lock_from_addr(tsdn, rtree_ctx, leak, |
| 1105 | false) == NULL); |
| 1106 | } |
| 1107 | return NULL; |
| 1108 | } |
| 1109 | unreachable(); |
| 1110 | } |
| 1111 | |
| 1112 | static bool |
| 1113 | extent_need_manual_zero(arena_t *arena) { |
no test coverage detected