forked from OSchip/llvm-project
19ea1d46cc
Summary: The secondary allocator is slow, because we map and unmap each block on allocation and deallocation. While I really like the security benefits of such a behavior, this yields very disappointing performance numbers on Android for larger allocation benchmarks. So this change adds a free list to the secondary, that will hold recently deallocated chunks, and (currently) release the extraneous memory. This allows to save on some memory mapping operations on allocation and deallocation. I do not think that this lowers the security of the secondary, but can increase the memory footprint a little bit (RSS & VA). The maximum number of blocks the free list can hold is templatable, `0U` meaning that we fallback to the old behavior. The higher that number, the higher the extra memory footprint. I added default configurations for all our platforms, but they are likely to change in the near future based on needs and feedback. Reviewers: hctim, morehouse, cferris, pcc, eugenis, vitalybuka Subscribers: mgorny, #sanitizers, llvm-commits Tags: #sanitizers, #llvm Differential Revision: https://reviews.llvm.org/D69570 |
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| .. | ||
| BlocksRuntime | ||
| asan | ||
| builtins | ||
| cfi | ||
| crt | ||
| dfsan | ||
| fuzzer | ||
| gwp_asan | ||
| hwasan | ||
| interception | ||
| lsan | ||
| msan | ||
| profile | ||
| safestack | ||
| sanitizer_common | ||
| scudo | ||
| stats | ||
| tsan | ||
| ubsan | ||
| ubsan_minimal | ||
| xray | ||
| CMakeLists.txt | ||