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Side by Side Diff: base/allocator/partition_allocator/PartitionAlloc.md

Issue 2518253002: Move Partition Allocator into Chromium base. (Closed)
Patch Set: Respond to more of Primiano's comments; move PartitionAllocator.* back to wtf; some build fixes Created 4 years ago
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1 # PartitionAlloc Design 1 # PartitionAlloc Design
2 2
3 This document explains a high-level design of PartitionAlloc. 3 This document explains a high-level design of PartitionAlloc.
4 If you're interested in its in-depth implementation, see comments 4 If you're interested in its in-depth implementation, see comments
5 in PartitionAlloc.h. 5 in PartitionAlloc.h.
6 6
7 [TOC] 7 [TOC]
8 8
9 ## Overview 9 ## Overview
10 10
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88 Linear overflow or underflow cannot corrupt the metadata. 88 Linear overflow or underflow cannot corrupt the metadata.
89 89
90 * Buckets are helpful to allocate different-sized objects on different addresses . 90 * Buckets are helpful to allocate different-sized objects on different addresses .
91 One page can contain only similar-sized objects. 91 One page can contain only similar-sized objects.
92 92
93 * Dereference of a freelist pointer should fault. 93 * Dereference of a freelist pointer should fault.
94 94
95 * Partial pointer overwrite of freelist pointer should fault. 95 * Partial pointer overwrite of freelist pointer should fault.
96 96
97 * Large allocations are guard-paged at the beginning and end. 97 * Large allocations are guard-paged at the beginning and end.
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