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scudo: Use more size classes in the malloc_free_loop benchmarks. 

As a result of recent changes to the Android size classes, the malloc_free_loop
benchmark started exhausting the 8192 size class at 32768 iterations. To avoid
this problem (and to make the test more realistic), change the benchmark to
use a variety of size classes.

Differential Revision: https://reviews.llvm.org/D73918
This commit is contained in:
Peter Collingbourne 2020-02-03 12:39:59 -08:00
parent 4b05fc248b
commit 47cda0cb36
1 changed files with 4 additions and 2 deletions
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6
compiler-rt/lib/scudo/standalone/benchmarks/malloc_benchmark.cpp
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@ -69,12 +69,14 @@ static void BM_malloc_free_loop(benchmark::State &State) {
void *Ptrs[NumIters];
for (auto _ : State) {
size_t SizeLog2 = 0;
for (void *&Ptr : Ptrs) {
Ptr = Allocator->allocate(8192, scudo::Chunk::Origin::Malloc);
Ptr = Allocator->allocate(1 << SizeLog2, scudo::Chunk::Origin::Malloc);
auto *Data = reinterpret_cast<uint8_t *>(Ptr);
for (size_t I = 0; I < 8192; I += PageSize)
for (size_t I = 0; I < 1 << SizeLog2; I += PageSize)
Data[I] = 1;
benchmark::DoNotOptimize(Ptr);
SizeLog2 = (SizeLog2 + 1) % 16;
}
for (void *&Ptr : Ptrs)
Allocator->deallocate(Ptr, scudo::Chunk::Origin::Malloc);