[compiler-rt] [scudo] Store more blocks in each TransferBatch (PR #70390)

[Christopher Ferris via llvm-commits]

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@@ -746,33 +726,57 @@ template <typename Config> class SizeClassAllocator32 {
       // Block used by `BatchGroup` is from BatchClassId. Turn the block into
       // `TransferBatch` with single block.
       TransferBatchT *TB = reinterpret_cast<TransferBatchT *>(BG);
-      TB->clear();
-      TB->add(
-          compactPtr(SizeClassMap::BatchClassId, reinterpret_cast<uptr>(TB)));
+      ToArray[0] =
+          compactPtr(SizeClassMap::BatchClassId, reinterpret_cast<uptr>(TB));
       Sci->FreeListInfo.PoppedBlocks += 1;
-      return TB;
+      return 1U;
     }
 
+    // So far, instead of always fill blocks to `MaxBlockCount`, we only examine
+    // single `TransferBatch` to minimize the time spent in the primary
+    // allocator. Besides, the sizes of `TransferBatch` and
+    // `CacheT::getMaxCached()` may also impact the times of accessing the
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cferris1000 wrote:

times of -> time spent

https://github.com/llvm/llvm-project/pull/70390