[compiler-rt] [scudo] Add partial chunk heuristic to retrieval algorithm. (PR #104807)

[via llvm-commits]

================
@@ -659,8 +710,15 @@ MapAllocator<Config>::tryAllocateFromCache(const Options &Options, uptr Size,
                                            FillContentsMode FillContents) {
   CachedBlock Entry;
   uptr EntryHeaderPos;
+  uptr MaxAllowedFragmentedBytes;
+  const uptr PageSize = getPageSizeCached();
+
+  MaxAllowedFragmentedBytes = MaxUnusedCachePages * PageSize;
+  if (LIKELY(!useMemoryTagging<Config>(Options)))
+    MaxAllowedFragmentedBytes += CachedBlock::ReleaseMemoryUpperBound;
----------------
ChiaHungDuan wrote:

if (UNLIKELY(useMemoryTagging ...))
   MaxAllowedFragmentedBytes = ...;

https://github.com/llvm/llvm-project/pull/104807