Index: lib/scudo/standalone/CMakeLists.txt =================================================================== --- lib/scudo/standalone/CMakeLists.txt +++ lib/scudo/standalone/CMakeLists.txt @@ -68,8 +68,11 @@ internal_defs.h linux.h list.h + local_cache.h mutex.h platform.h + primary32.h + primary64.h quarantine.h release.h report.h Index: lib/scudo/standalone/local_cache.h =================================================================== --- /dev/null +++ lib/scudo/standalone/local_cache.h @@ -0,0 +1,177 @@ +//===-- local_cache.h -------------------------------------------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef SCUDO_LOCAL_CACHE_H_ +#define SCUDO_LOCAL_CACHE_H_ + +#include "internal_defs.h" +#include "stats.h" + +namespace scudo { + +template struct SizeClassAllocatorLocalCache { + typedef typename SizeClassAllocator::SizeClassMap SizeClassMap; + + struct TransferBatch { + static const u32 MaxNumCached = SizeClassMap::MaxNumCachedHint; + void setFromArray(void **Array, u32 N) { + DCHECK_LE(N, MaxNumCached); + for (u32 I = 0; I < N; I++) + Batch[I] = Array[I]; + Count = N; + } + void clear() { Count = 0; } + void add(void *P) { + DCHECK_LT(Count, MaxNumCached); + Batch[Count++] = P; + } + void copyToArray(void **Array) const { + for (u32 I = 0; I < Count; I++) + Array[I] = Batch[I]; + } + u32 getCount() const { return Count; } + void *get(u32 I) const { + DCHECK_LE(I, Count); + return Batch[I]; + } + static u32 MaxCached(uptr Size) { + return Min(MaxNumCached, SizeClassMap::getMaxCachedHint(Size)); + } + TransferBatch *Next; + + private: + u32 Count; + void *Batch[MaxNumCached]; + }; + + void initLinkerInitialized(GlobalStats *S, SizeClassAllocator *A) { + Stats.initLinkerInitialized(); + if (S) + S->link(&Stats); + Allocator = A; + } + + void init(GlobalStats *S, SizeClassAllocator *A) { + memset(this, 0, sizeof(*this)); + initLinkerInitialized(S, A); + } + + void destroy(GlobalStats *S) { + drain(); + if (S) + S->unlink(&Stats); + } + + void *allocate(uptr ClassId) { + CHECK_LT(ClassId, NumClasses); + PerClass *C = &PerClassArray[ClassId]; + if (C->Count == 0) { + if (UNLIKELY(!refill(C, ClassId))) + return nullptr; + DCHECK_GT(C->Count, 0); + } + // We read ClassSize first before accessing Chunks because it's adjacent to + // Count, while Chunks might be further off (depending on Count). That keeps + // the memory accesses in close quarters. + const uptr ClassSize = C->ClassSize; + void *P = C->Chunks[--C->Count]; + // The jury is still out as to whether any kind of PREFETCH here increases + // performance. It definitely decreases performance on Android though. + // if (!SCUDO_ANDROID) PREFETCH(P); + Stats.add(StatAllocated, ClassSize); + return P; + } + + void deallocate(uptr ClassId, void *P) { + CHECK_LT(ClassId, NumClasses); + PerClass *C = &PerClassArray[ClassId]; + // We still have to initialize the cache in the event that the first heap + // operation in a thread is a deallocation. + initCacheMaybe(C); + if (C->Count == C->MaxCount) + drain(C, ClassId); + // See comment in allocate() about memory accesses. + const uptr ClassSize = C->ClassSize; + C->Chunks[C->Count++] = P; + Stats.sub(StatAllocated, ClassSize); + } + + void drain() { + for (uptr I = 0; I < NumClasses; I++) { + PerClass *C = &PerClassArray[I]; + while (C->Count > 0) + drain(C, I); + } + } + + TransferBatch *createBatch(uptr ClassId, void *B) { + if (ClassId != SizeClassMap::BatchClassId) + B = allocate(SizeClassMap::BatchClassId); + return reinterpret_cast(B); + } + + LocalStats &getStats() { return Stats; } + +private: + static const uptr NumClasses = SizeClassMap::NumClasses; + struct PerClass { + u32 Count; + u32 MaxCount; + uptr ClassSize; + void *Chunks[2 * TransferBatch::MaxNumCached]; + }; + PerClass PerClassArray[NumClasses]; + LocalStats Stats; + SizeClassAllocator *Allocator; + + ALWAYS_INLINE void initCacheMaybe(PerClass *C) { + if (LIKELY(C->MaxCount)) + return; + initCache(); + DCHECK_NE(C->MaxCount, 0U); + } + + NOINLINE void initCache() { + for (uptr I = 0; I < NumClasses; I++) { + PerClass *P = &PerClassArray[I]; + const uptr Size = SizeClassAllocator::getSizeByClassId(I); + P->MaxCount = 2 * TransferBatch::MaxCached(Size); + P->ClassSize = Size; + } + } + + void destroyBatch(uptr ClassId, void *B) { + if (ClassId != SizeClassMap::BatchClassId) + deallocate(SizeClassMap::BatchClassId, B); + } + + NOINLINE bool refill(PerClass *C, uptr ClassId) { + initCacheMaybe(C); + TransferBatch *B = Allocator->popBatch(this, ClassId); + if (UNLIKELY(!B)) + return false; + DCHECK_GT(B->getCount(), 0); + B->copyToArray(C->Chunks); + C->Count = B->getCount(); + destroyBatch(ClassId, B); + return true; + } + + NOINLINE void drain(PerClass *C, uptr ClassId) { + const u32 Count = Min(C->MaxCount / 2, C->Count); + const uptr FirstIndexToDrain = C->Count - Count; + TransferBatch *B = createBatch(ClassId, C->Chunks[FirstIndexToDrain]); + B->setFromArray(&C->Chunks[FirstIndexToDrain], Count); + C->Count -= Count; + Allocator->pushBatch(ClassId, B); + } +}; + +} // namespace scudo + +#endif // SCUDO_LOCAL_CACHE_H_ Index: lib/scudo/standalone/primary32.h =================================================================== --- /dev/null +++ lib/scudo/standalone/primary32.h @@ -0,0 +1,388 @@ +//===-- primary32.h ---------------------------------------------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef SCUDO_PRIMARY32_H_ +#define SCUDO_PRIMARY32_H_ + +#include "bytemap.h" +#include "common.h" +#include "list.h" +#include "local_cache.h" +#include "release.h" +#include "report.h" +#include "stats.h" +#include "string_utils.h" + +namespace scudo { + +// SizeClassAllocator32 is an allocator for 32 or 64-bit address space. +// +// It maps Regions of 2^RegionSizeLog bytes aligned on a 2^RegionSizeLog bytes +// boundary, and keeps a bytemap of the mappable address space to track the size +// class they are associated with. +// +// Mapped regions are split into equally sized Blocks according to the size +// class they belong to, and the associated pointers are shuffled to prevent any +// predictable address pattern (the predictability increases with the block +// size). +// +// Regions for size class 0 are special and used to hold TransferBatches, which +// allow to transfer arrays of pointers from the global size class freelist to +// the thread specific freelist for said class, and back. +// +// Memory used by this allocator is never unmapped but can be partially +// reclaimed if the platform allows for it. + +template class SizeClassAllocator32 { +public: + typedef SizeClassMapT SizeClassMap; + // Regions should be large enough to hold the largest Block. + COMPILER_CHECK((1UL << RegionSizeLog) >= SizeClassMap::MaxSize); + typedef SizeClassAllocator32 ThisT; + typedef SizeClassAllocatorLocalCache CacheT; + typedef typename CacheT::TransferBatch TransferBatch; + + static uptr getSizeByClassId(uptr ClassId) { + return (ClassId == SizeClassMap::BatchClassId) + ? sizeof(TransferBatch) + : SizeClassMap::getSizeByClassId(ClassId); + } + + static bool canAllocate(uptr Size) { return Size <= SizeClassMap::MaxSize; } + + void initLinkerInitialized(s32 ReleaseToOsInterval) { + if (SCUDO_FUCHSIA) + reportError("SizeClassAllocator32 is not supported on Fuchsia"); + + PossibleRegions.initLinkerInitialized(); + MinRegionIndex = NumRegions; // MaxRegionIndex is already initialized to 0. + + u32 Seed; + if (UNLIKELY(!getRandom(reinterpret_cast(&Seed), sizeof(Seed)))) + Seed = + static_cast(getMonotonicTime() ^ + (reinterpret_cast(SizeClassInfoArray) >> 6)); + const uptr PageSize = getPageSizeCached(); + for (uptr I = 0; I < NumClasses; I++) { + SizeClassInfo *Sci = getSizeClassInfo(I); + Sci->RandState = getRandomU32(&Seed); + // See comment in the 64-bit primary about releasing smaller size classes. + Sci->CanRelease = (ReleaseToOsInterval > 0) && + (I != SizeClassMap::BatchClassId) && + (getSizeByClassId(I) >= (PageSize / 32)); + } + ReleaseToOsIntervalMs = ReleaseToOsInterval; + } + void init(s32 ReleaseToOsInterval) { + memset(this, 0, sizeof(*this)); + initLinkerInitialized(ReleaseToOsInterval); + } + + TransferBatch *popBatch(CacheT *C, uptr ClassId) { + DCHECK_LT(ClassId, NumClasses); + SizeClassInfo *Sci = getSizeClassInfo(ClassId); + BlockingMutexLock L(&Sci->Mutex); + TransferBatch *B = Sci->FreeList.front(); + if (B) + Sci->FreeList.pop_front(); + else { + B = populateFreeList(C, ClassId, Sci); + if (UNLIKELY(!B)) + return nullptr; + } + DCHECK_GT(B->getCount(), 0); + Sci->Stats.PoppedBlocks += B->getCount(); + return B; + } + + void pushBatch(uptr ClassId, TransferBatch *B) { + DCHECK_LT(ClassId, NumClasses); + DCHECK_GT(B->getCount(), 0); + SizeClassInfo *Sci = getSizeClassInfo(ClassId); + BlockingMutexLock L(&Sci->Mutex); + Sci->FreeList.push_front(B); + Sci->Stats.PushedBlocks += B->getCount(); + if (Sci->CanRelease) + releaseToOSMaybe(Sci, ClassId); + } + + void disable() { + for (uptr I = 0; I < NumClasses; I++) + getSizeClassInfo(I)->Mutex.lock(); + } + + void enable() { + for (sptr I = static_cast(NumClasses) - 1; I >= 0; I--) + getSizeClassInfo(I)->Mutex.unlock(); + } + + template void iterateOverBlocks(F Callback) { + for (uptr I = MinRegionIndex; I <= MaxRegionIndex; I++) + if (PossibleRegions[I]) { + const uptr BlockSize = getSizeByClassId(PossibleRegions[I]); + const uptr From = I * RegionSize; + const uptr To = From + (RegionSize / BlockSize) * BlockSize; + for (uptr Block = From; Block < To; Block += BlockSize) + Callback(Block); + } + } + + void printStats() { + // TODO(kostyak): get the RSS per region. + uptr TotalMapped = 0; + uptr PoppedBlocks = 0; + uptr PushedBlocks = 0; + for (uptr I = 0; I < NumClasses; I++) { + SizeClassInfo *Sci = getSizeClassInfo(I); + TotalMapped += Sci->AllocatedUser; + PoppedBlocks += Sci->Stats.PoppedBlocks; + PushedBlocks += Sci->Stats.PushedBlocks; + } + Printf("Stats: SizeClassAllocator32: %zuM mapped in %zu allocations; " + "remains %zu\n", + TotalMapped >> 20, PoppedBlocks, PoppedBlocks - PushedBlocks); + for (uptr I = 0; I < NumClasses; I++) + printStats(I, 0); + } + + void releaseToOS() { + for (uptr I = 1; I < NumClasses; I++) { + SizeClassInfo *Sci = getSizeClassInfo(I); + BlockingMutexLock L(&Sci->Mutex); + releaseToOSMaybe(Sci, I, /*Force=*/true); + } + } + +private: + static const uptr NumClasses = SizeClassMap::NumClasses; + static const uptr RegionSize = 1UL << RegionSizeLog; + static const uptr NumRegions = SCUDO_MMAP_RANGE_SIZE >> RegionSizeLog; +#if SCUDO_WORDSIZE == 32U + typedef FlatByteMap ByteMap; +#else + typedef TwoLevelByteMap<(NumRegions >> 12), 1UL << 12> ByteMap; +#endif + + struct SizeClassStats { + uptr PoppedBlocks; + uptr PushedBlocks; + }; + + struct ReleaseToOsInfo { + uptr PushedBlocksAtLastRelease; + uptr RangesReleased; + uptr LastReleasedBytes; + u64 LastReleaseAtNs; + }; + + struct ALIGNED(SCUDO_CACHE_LINE_SIZE) SizeClassInfo { + BlockingMutex Mutex; + IntrusiveList FreeList; + SizeClassStats Stats; + bool CanRelease; + u32 RandState; + uptr AllocatedUser; + ReleaseToOsInfo ReleaseInfo; + }; + COMPILER_CHECK(sizeof(SizeClassInfo) % SCUDO_CACHE_LINE_SIZE == 0); + + uptr computeRegionId(uptr Mem) { + const uptr Id = Mem >> RegionSizeLog; + CHECK_LT(Id, NumRegions); + return Id; + } + + uptr allocateRegionSlow() { + uptr MapSize = 2 * RegionSize; + const uptr MapBase = reinterpret_cast( + map(nullptr, MapSize, "scudo:primary", MAP_ALLOWNOMEM)); + if (UNLIKELY(!MapBase)) + return 0; + const uptr MapEnd = MapBase + MapSize; + uptr Region = MapBase; + if (isAligned(Region, RegionSize)) { + SpinMutexLock L(&RegionsStashMutex); + if (NumberOfStashedRegions < MaxStashedRegions) + RegionsStash[NumberOfStashedRegions++] = MapBase + RegionSize; + else + MapSize = RegionSize; + } else { + Region = roundUpTo(MapBase, RegionSize); + unmap(reinterpret_cast(MapBase), Region - MapBase); + MapSize = RegionSize; + } + const uptr End = Region + MapSize; + if (End != MapEnd) + unmap(reinterpret_cast(End), MapEnd - End); + return Region; + } + + uptr allocateRegion(uptr ClassId) { + DCHECK_LT(ClassId, NumClasses); + uptr Region = 0; + { + SpinMutexLock L(&RegionsStashMutex); + if (NumberOfStashedRegions > 0) + Region = RegionsStash[--NumberOfStashedRegions]; + } + if (!Region) + Region = allocateRegionSlow(); + if (LIKELY(Region)) { + if (ClassId) { + const uptr RegionIndex = computeRegionId(Region); + if (RegionIndex < MinRegionIndex) + MinRegionIndex = RegionIndex; + if (RegionIndex > MaxRegionIndex) + MaxRegionIndex = RegionIndex; + PossibleRegions.set(RegionIndex, static_cast(ClassId)); + } + } + return Region; + } + + SizeClassInfo *getSizeClassInfo(uptr ClassId) { + DCHECK_LT(ClassId, NumClasses); + return &SizeClassInfoArray[ClassId]; + } + + bool populateBatches(CacheT *C, SizeClassInfo *Sci, uptr ClassId, + TransferBatch **CurrentBatch, u32 MaxCount, + void **PointersArray, u32 Count) { + if (ClassId != SizeClassMap::BatchClassId) + shuffle(PointersArray, Count, &Sci->RandState); + TransferBatch *B = *CurrentBatch; + for (uptr I = 0; I < Count; I++) { + if (B && B->getCount() == MaxCount) { + Sci->FreeList.push_back(B); + B = nullptr; + } + if (!B) { + B = C->createBatch(ClassId, PointersArray[I]); + if (UNLIKELY(!B)) + return false; + B->clear(); + } + B->add(PointersArray[I]); + } + *CurrentBatch = B; + return true; + } + + NOINLINE TransferBatch *populateFreeList(CacheT *C, uptr ClassId, + SizeClassInfo *Sci) { + const uptr Region = allocateRegion(ClassId); + if (UNLIKELY(!Region)) + return nullptr; + C->getStats().add(StatMapped, RegionSize); + const uptr Size = getSizeByClassId(ClassId); + const u32 MaxCount = TransferBatch::MaxCached(Size); + DCHECK_GT(MaxCount, 0); + const uptr NumberOfBlocks = RegionSize / Size; + DCHECK_GT(NumberOfBlocks, 0); + TransferBatch *B = nullptr; + constexpr uptr ShuffleArraySize = 48; + void *ShuffleArray[ShuffleArraySize]; + u32 Count = 0; + const uptr AllocatedUser = NumberOfBlocks * Size; + for (uptr I = Region; I < Region + AllocatedUser; I += Size) { + ShuffleArray[Count++] = reinterpret_cast(I); + if (Count == ShuffleArraySize) { + if (UNLIKELY(!populateBatches(C, Sci, ClassId, &B, MaxCount, + ShuffleArray, Count))) + return nullptr; + Count = 0; + } + } + if (Count) { + if (UNLIKELY(!populateBatches(C, Sci, ClassId, &B, MaxCount, ShuffleArray, + Count))) + return nullptr; + } + DCHECK(B); + DCHECK_GT(B->getCount(), 0); + Sci->AllocatedUser += AllocatedUser; + if (Sci->CanRelease) + Sci->ReleaseInfo.LastReleaseAtNs = getMonotonicTime(); + return B; + } + + void printStats(uptr ClassId, uptr Rss) { + SizeClassInfo *Sci = getSizeClassInfo(ClassId); + if (Sci->AllocatedUser == 0) + return; + const uptr InUse = Sci->Stats.PoppedBlocks - Sci->Stats.PushedBlocks; + const uptr AvailableChunks = Sci->AllocatedUser / getSizeByClassId(ClassId); + Printf(" %02zu (%6zu): mapped: %6zuK popped: %7zu pushed: %7zu inuse: %6zu" + " avail: %6zu rss: %6zuK\n", + ClassId, getSizeByClassId(ClassId), Sci->AllocatedUser >> 10, + Sci->Stats.PoppedBlocks, Sci->Stats.PushedBlocks, InUse, + AvailableChunks, Rss >> 10); + } + + NOINLINE void releaseToOSMaybe(SizeClassInfo *Sci, uptr ClassId, + bool Force = false) { + const uptr BlockSize = getSizeByClassId(ClassId); + const uptr PageSize = getPageSizeCached(); + + CHECK_GE(Sci->Stats.PoppedBlocks, Sci->Stats.PushedBlocks); + const uptr N = Sci->Stats.PoppedBlocks - Sci->Stats.PushedBlocks; + if (N * BlockSize < PageSize) + return; // No chance to release anything. + if ((Sci->Stats.PushedBlocks - Sci->ReleaseInfo.PushedBlocksAtLastRelease) * + BlockSize < + PageSize) { + return; // Nothing new to release. + } + + if (!Force) { + const s32 IntervalMs = ReleaseToOsIntervalMs; + if (IntervalMs < 0) + return; + if (Sci->ReleaseInfo.LastReleaseAtNs + IntervalMs * 1000000ULL > + getMonotonicTime()) { + return; // Memory was returned recently. + } + } + + // TODO(kostyak): currently not ideal as we loop over all regions and + // iterate multiple times over the same freelist if a ClassId spans multiple + // regions. But it will have to do for now. + for (uptr I = MinRegionIndex; I <= MaxRegionIndex; I++) { + if (PossibleRegions[I] == ClassId) { + ReleaseRecorder Recorder(I * RegionSize); + releaseFreeMemoryToOS(&Sci->FreeList, I * RegionSize, + RegionSize / PageSize, BlockSize, &Recorder); + if (Recorder.getReleasedRangesCount() > 0) { + Sci->ReleaseInfo.PushedBlocksAtLastRelease = Sci->Stats.PushedBlocks; + Sci->ReleaseInfo.RangesReleased += Recorder.getReleasedRangesCount(); + Sci->ReleaseInfo.LastReleasedBytes = Recorder.getReleasedBytes(); + } + } + } + Sci->ReleaseInfo.LastReleaseAtNs = getMonotonicTime(); + } + + SizeClassInfo SizeClassInfoArray[NumClasses]; + + ByteMap PossibleRegions; + // Keep track of the lowest & highest regions allocated to avoid looping + // through the whole NumRegions. + uptr MinRegionIndex; + uptr MaxRegionIndex; + s32 ReleaseToOsIntervalMs; + // Unless several threads request regions simultaneously from different size + // classes, the stash rarely contains more than 1 entry. + static constexpr uptr MaxStashedRegions = 4; + StaticSpinMutex RegionsStashMutex; + uptr NumberOfStashedRegions; + uptr RegionsStash[MaxStashedRegions]; +}; + +} // namespace scudo + +#endif // SCUDO_PRIMARY32_H_ Index: lib/scudo/standalone/primary64.h =================================================================== --- /dev/null +++ lib/scudo/standalone/primary64.h @@ -0,0 +1,373 @@ +//===-- primary64.h ---------------------------------------------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef SCUDO_PRIMARY64_H_ +#define SCUDO_PRIMARY64_H_ + +#include "bytemap.h" +#include "common.h" +#include "list.h" +#include "local_cache.h" +#include "release.h" +#include "stats.h" +#include "string_utils.h" + +namespace scudo { + +// SizeClassAllocator64 is an allocator tuned for 64-bit address space. +// +// It starts by reserving NumClasses * 2^RegionSizeLog bytes, equally divided in +// Regions, specific to each size class. Note that the base of that mapping is +// random (based to the platform specific map() capabilities), and that each +// Region actually starts at a random offset from its base. +// +// Regions are mapped incrementally on demand to fulfill allocation requests, +// those mappings being split into equally sized Blocks based on the size class +// they belong to. The Blocks created are shuffled to prevent predictable +// address patterns (the predictability increases with the size of the Blocks). +// +// The 1st Region (for size class 0) holds the TransferBatches. This is a +// structure used to transfer arrays of available pointers from the class size +// freelist to the thread specific freelist, and back. +// +// The memory used by this allocator is never unmapped, but can be partially +// released it the platform allows for it. + +template class SizeClassAllocator64 { +public: + typedef SizeClassMapT SizeClassMap; + typedef SizeClassAllocator64 ThisT; + typedef SizeClassAllocatorLocalCache CacheT; + typedef typename CacheT::TransferBatch TransferBatch; + + static uptr getSizeByClassId(uptr ClassId) { + return (ClassId == SizeClassMap::BatchClassId) + ? sizeof(TransferBatch) + : SizeClassMap::getSizeByClassId(ClassId); + } + + static bool canAllocate(uptr Size) { return Size <= SizeClassMap::MaxSize; } + + void initLinkerInitialized(s32 ReleaseToOsInterval) { + // Reserve the space required for the Primary. + PrimaryBase = reinterpret_cast( + map(nullptr, PrimarySize, "scudo:primary", MAP_NOACCESS, &Data)); + + RegionInfoArray = reinterpret_cast( + map(nullptr, sizeof(RegionInfo) * NumClasses, "scudo:regioninfo")); + DCHECK_EQ(reinterpret_cast(RegionInfoArray) % SCUDO_CACHE_LINE_SIZE, + 0); + + u32 Seed; + if (UNLIKELY(!getRandom(reinterpret_cast(&Seed), sizeof(Seed)))) + Seed = static_cast(getMonotonicTime() ^ (PrimaryBase >> 12)); + const uptr PageSize = getPageSizeCached(); + for (uptr I = 0; I < NumClasses; I++) { + RegionInfo *Region = getRegionInfo(I); + // The actual start of a region is offseted by a random number of pages. + Region->RegionBeg = + getRegionBaseByClassId(I) + (getRandomModN(&Seed, 16) + 1) * PageSize; + // Releasing smaller size classes doesn't necessarily yield to a meaningul + // RSS impact: there are more blocks per page, they are randomized around, + // and thus pages are less likely to be entirely empty. On top of this, + // attempting to release those require more iterations and memory accesses + // which ends up being fairly costly. The current lower limit is mostly + // arbitrary and based on empirical observations. + // TODO(kostyak): make the lower limit a runtime option + Region->CanRelease = (ReleaseToOsInterval > 0) && + (I != SizeClassMap::BatchClassId) && + (getSizeByClassId(I) >= (PageSize / 32)); + Region->RandState = getRandomU32(&Seed); + } + ReleaseToOsIntervalMs = ReleaseToOsInterval; + } + void init(s32 ReleaseToOsInterval) { + memset(this, 0, sizeof(*this)); + initLinkerInitialized(ReleaseToOsInterval); + } + + TransferBatch *popBatch(CacheT *C, uptr ClassId) { + DCHECK_LT(ClassId, NumClasses); + RegionInfo *Region = getRegionInfo(ClassId); + BlockingMutexLock L(&Region->Mutex); + TransferBatch *B = Region->FreeList.front(); + if (B) + Region->FreeList.pop_front(); + else { + B = populateFreeList(C, ClassId, Region); + if (UNLIKELY(!B)) + return nullptr; + } + DCHECK_GT(B->getCount(), 0); + Region->Stats.PoppedBlocks += B->getCount(); + return B; + } + + void pushBatch(uptr ClassId, TransferBatch *B) { + DCHECK_GT(B->getCount(), 0); + RegionInfo *Region = getRegionInfo(ClassId); + BlockingMutexLock L(&Region->Mutex); + Region->FreeList.push_front(B); + Region->Stats.PushedBlocks += B->getCount(); + if (Region->CanRelease) + releaseToOSMaybe(Region, ClassId); + } + + void disable() { + for (uptr I = 0; I < NumClasses; I++) + getRegionInfo(I)->Mutex.lock(); + } + + void enable() { + for (sptr I = static_cast(NumClasses) - 1; I >= 0; I--) + getRegionInfo(I)->Mutex.unlock(); + } + + template void iterateOverBlocks(F Callback) const { + for (uptr I = 1; I < NumClasses; I++) { + const RegionInfo *Region = getRegionInfo(I); + const uptr BlockSize = getSizeByClassId(I); + const uptr From = Region->RegionBeg; + const uptr To = From + Region->AllocatedUser; + for (uptr Block = From; Block < To; Block += BlockSize) + Callback(Block); + } + } + + void printStats() const { + // TODO(kostyak): get the RSS per region. + uptr TotalMapped = 0; + uptr PoppedBlocks = 0; + uptr PushedBlocks = 0; + for (uptr I = 0; I < NumClasses; I++) { + RegionInfo *Region = getRegionInfo(I); + if (Region->MappedUser) + TotalMapped += Region->MappedUser; + PoppedBlocks += Region->Stats.PoppedBlocks; + PushedBlocks += Region->Stats.PushedBlocks; + } + Printf("Stats: Primary64: %zuM mapped (%zuM rss) in %zu allocations; " + "remains %zu\n", + TotalMapped >> 20, 0, PoppedBlocks, PoppedBlocks - PushedBlocks); + + for (uptr I = 0; I < NumClasses; I++) + printStats(I, 0); + } + + void releaseToOS() { + for (uptr I = 1; I < NumClasses; I++) { + RegionInfo *Region = getRegionInfo(I); + BlockingMutexLock L(&Region->Mutex); + releaseToOSMaybe(Region, I, /*Force=*/true); + } + } + +private: + static const uptr RegionSize = 1UL << RegionSizeLog; + static const uptr NumClasses = SizeClassMap::NumClasses; + static const uptr PrimarySize = RegionSize * NumClasses; + + // Call map for user memory with at least this size. + static const uptr MapSizeIncrement = 1UL << 16; + + struct RegionStats { + uptr PoppedBlocks; + uptr PushedBlocks; + }; + + struct ReleaseToOsInfo { + uptr PushedBlocksAtLastRelease; + uptr RangesReleased; + uptr LastReleasedBytes; + u64 LastReleaseAtNs; + }; + + struct ALIGNED(SCUDO_CACHE_LINE_SIZE) RegionInfo { + BlockingMutex Mutex; + IntrusiveList FreeList; + RegionStats Stats; + bool CanRelease; + bool Exhausted; + u32 RandState; + uptr RegionBeg; + uptr MappedUser; // Bytes mapped for user memory. + uptr AllocatedUser; // Bytes allocated for user memory. + MapPlatformData Data; + ReleaseToOsInfo ReleaseInfo; + }; + COMPILER_CHECK(sizeof(RegionInfo) % SCUDO_CACHE_LINE_SIZE == 0); + + uptr PrimaryBase; + RegionInfo *RegionInfoArray; + MapPlatformData Data; + s32 ReleaseToOsIntervalMs; + + RegionInfo *getRegionInfo(uptr ClassId) const { + DCHECK_LT(ClassId, NumClasses); + return &RegionInfoArray[ClassId]; + } + + uptr getRegionBaseByClassId(uptr ClassId) const { + return PrimaryBase + (ClassId << RegionSizeLog); + } + + bool populateBatches(CacheT *C, RegionInfo *Region, uptr ClassId, + TransferBatch **CurrentBatch, u32 MaxCount, + void **PointersArray, u32 Count) { + // No need to shuffle the batches size class. + if (ClassId != SizeClassMap::BatchClassId) + shuffle(PointersArray, Count, &Region->RandState); + TransferBatch *B = *CurrentBatch; + for (uptr I = 0; I < Count; I++) { + if (B && B->getCount() == MaxCount) { + Region->FreeList.push_back(B); + B = nullptr; + } + if (!B) { + B = C->createBatch(ClassId, PointersArray[I]); + if (UNLIKELY(!B)) + return false; + B->clear(); + } + B->add(PointersArray[I]); + } + *CurrentBatch = B; + return true; + } + + NOINLINE TransferBatch *populateFreeList(CacheT *C, uptr ClassId, + RegionInfo *Region) { + const uptr Size = getSizeByClassId(ClassId); + const u32 MaxCount = TransferBatch::MaxCached(Size); + + const uptr RegionBeg = Region->RegionBeg; + const uptr MappedUser = Region->MappedUser; + const uptr TotalUserBytes = Region->AllocatedUser + MaxCount * Size; + // Map more space for blocks, if necessary. + if (LIKELY(TotalUserBytes > MappedUser)) { + // Do the mmap for the user memory. + const uptr UserMapSize = + roundUpTo(TotalUserBytes - MappedUser, MapSizeIncrement); + const uptr RegionBase = RegionBeg - getRegionBaseByClassId(ClassId); + if (UNLIKELY(RegionBase + MappedUser + UserMapSize > RegionSize)) { + if (!Region->Exhausted) { + Region->Exhausted = true; + printStats(); + Printf( + "Scudo OOM: The process has Exhausted %zuM for size class %zu.\n", + RegionSize >> 20, Size); + } + return nullptr; + } + if (MappedUser == 0) + Region->Data = Data; + if (UNLIKELY(!map(reinterpret_cast(RegionBeg + MappedUser), + UserMapSize, "scudo:primary", + MAP_ALLOWNOMEM | MAP_RESIZABLE, &Region->Data))) + return nullptr; + Region->MappedUser += UserMapSize; + C->getStats().add(StatMapped, UserMapSize); + } + + const uptr NumberOfBlocks = Min( + 8UL * MaxCount, (Region->MappedUser - Region->AllocatedUser) / Size); + DCHECK_GT(NumberOfBlocks, 0); + + TransferBatch *B = nullptr; + constexpr uptr ShuffleArraySize = 48; + void *ShuffleArray[ShuffleArraySize]; + u32 Count = 0; + const uptr P = RegionBeg + Region->AllocatedUser; + const uptr AllocatedUser = NumberOfBlocks * Size; + for (uptr I = P; I < P + AllocatedUser; I += Size) { + ShuffleArray[Count++] = reinterpret_cast(I); + if (Count == ShuffleArraySize) { + if (UNLIKELY(!populateBatches(C, Region, ClassId, &B, MaxCount, + ShuffleArray, Count))) + return nullptr; + Count = 0; + } + } + if (Count) { + if (UNLIKELY(!populateBatches(C, Region, ClassId, &B, MaxCount, + ShuffleArray, Count))) + return nullptr; + } + DCHECK(B); + CHECK_GT(B->getCount(), 0); + + Region->AllocatedUser += AllocatedUser; + Region->Exhausted = false; + if (Region->CanRelease) + Region->ReleaseInfo.LastReleaseAtNs = getMonotonicTime(); + + return B; + } + + void printStats(uptr ClassId, uptr Rss) const { + RegionInfo *Region = getRegionInfo(ClassId); + if (Region->MappedUser == 0) + return; + const uptr InUse = Region->Stats.PoppedBlocks - Region->Stats.PushedBlocks; + const uptr AvailableChunks = + Region->AllocatedUser / getSizeByClassId(ClassId); + Printf("%s %02zu (%6zu): mapped: %6zuK popped: %7zu pushed: %7zu inuse: " + "%6zu avail: %6zu rss: %6zuK releases: %6zu last released: %6zuK " + "region: 0x%zx (0x%zx)\n", + Region->Exhausted ? "F" : " ", ClassId, getSizeByClassId(ClassId), + Region->MappedUser >> 10, Region->Stats.PoppedBlocks, + Region->Stats.PushedBlocks, InUse, AvailableChunks, Rss >> 10, + Region->ReleaseInfo.RangesReleased, + Region->ReleaseInfo.LastReleasedBytes >> 10, Region->RegionBeg, + getRegionBaseByClassId(ClassId)); + } + + NOINLINE void releaseToOSMaybe(RegionInfo *Region, uptr ClassId, + bool Force = false) { + const uptr BlockSize = getSizeByClassId(ClassId); + const uptr PageSize = getPageSizeCached(); + + CHECK_GE(Region->Stats.PoppedBlocks, Region->Stats.PushedBlocks); + const uptr N = Region->Stats.PoppedBlocks - Region->Stats.PushedBlocks; + if (N * BlockSize < PageSize) + return; // No chance to release anything. + if ((Region->Stats.PushedBlocks - + Region->ReleaseInfo.PushedBlocksAtLastRelease) * + BlockSize < + PageSize) { + return; // Nothing new to release. + } + + if (!Force) { + const s32 IntervalMs = ReleaseToOsIntervalMs; + if (IntervalMs < 0) + return; + if (Region->ReleaseInfo.LastReleaseAtNs + IntervalMs * 1000000ULL > + getMonotonicTime()) { + return; // Memory was returned recently. + } + } + + ReleaseRecorder Recorder(Region->RegionBeg, &Region->Data); + releaseFreeMemoryToOS(&Region->FreeList, Region->RegionBeg, + roundUpTo(Region->AllocatedUser, PageSize) / PageSize, + BlockSize, &Recorder); + + if (Recorder.getReleasedRangesCount() > 0) { + Region->ReleaseInfo.PushedBlocksAtLastRelease = + Region->Stats.PushedBlocks; + Region->ReleaseInfo.RangesReleased += Recorder.getReleasedRangesCount(); + Region->ReleaseInfo.LastReleasedBytes = Recorder.getReleasedBytes(); + } + Region->ReleaseInfo.LastReleaseAtNs = getMonotonicTime(); + } +}; + +} // namespace scudo + +#endif // SCUDO_PRIMARY64_H_ Index: lib/scudo/standalone/tests/CMakeLists.txt =================================================================== --- lib/scudo/standalone/tests/CMakeLists.txt +++ lib/scudo/standalone/tests/CMakeLists.txt @@ -57,6 +57,7 @@ list_test.cc map_test.cc mutex_test.cc + primary_test.cc quarantine_test.cc release_test.cc report_test.cc Index: lib/scudo/standalone/tests/primary_test.cc =================================================================== --- /dev/null +++ lib/scudo/standalone/tests/primary_test.cc @@ -0,0 +1,176 @@ +//===-- primary_test.cc -----------------------------------------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "primary32.h" +#include "primary64.h" +#include "size_class_map.h" + +#include "gtest/gtest.h" + +#include +#include +#include + +// Note that with small enough regions, the SizeClassAllocator64 also works on +// 32-bit architectures. It's not something we want to encourage, but we still +// should ensure the tests pass. + +template static void testPrimary() { + const scudo::uptr NumberOfAllocations = 32U; + std::unique_ptr Allocator(new Primary); + Allocator->init(/*ReleaseToOsInterval=*/-1); + typename Primary::CacheT Cache; + Cache.init(nullptr, Allocator.get()); + for (scudo::uptr I = 0; I <= 16U; I++) { + const scudo::uptr Size = 1UL << I; + if (!Primary::canAllocate(Size)) + continue; + const scudo::uptr ClassId = Primary::SizeClassMap::getClassIdBySize(Size); + void *Pointers[NumberOfAllocations]; + for (scudo::uptr J = 0; J < NumberOfAllocations; J++) { + void *P = Cache.allocate(ClassId); + memset(P, 'B', Size); + Pointers[J] = P; + } + for (scudo::uptr J = 0; J < NumberOfAllocations; J++) + Cache.deallocate(ClassId, Pointers[J]); + } + Cache.destroy(nullptr); + Allocator->releaseToOS(); + Allocator->printStats(); +} + +TEST(ScudoPrimaryTest, BasicPrimary) { + using SizeClassMap = scudo::DefaultSizeClassMap; + testPrimary>(); + testPrimary>(); +} + +// The 64-bit SizeClassAllocator can be easily OOM'd with small region sizes. +// For the 32-bit one, it requires actually exhausting memory, so we skip it. +TEST(ScudoPrimaryTest, Primary64OOM) { + using Primary = scudo::SizeClassAllocator64; + using TransferBatch = Primary::CacheT::TransferBatch; + Primary Allocator; + Allocator.init(/*ReleaseToOsInterval=*/-1); + typename Primary::CacheT Cache; + scudo::GlobalStats Stats; + Stats.init(); + Cache.init(&Stats, &Allocator); + bool AllocationFailed = false; + std::vector Batches; + const scudo::uptr ClassId = Primary::SizeClassMap::LargestClassId; + const scudo::uptr Size = Primary::getSizeByClassId(ClassId); + for (scudo::uptr I = 0; I < 10000U; I++) { + TransferBatch *B = Allocator.popBatch(&Cache, ClassId); + if (!B) { + AllocationFailed = true; + break; + } + for (scudo::uptr J = 0; J < B->getCount(); J++) + memset(B->get(J), 'B', Size); + Batches.push_back(B); + } + while (!Batches.empty()) { + Allocator.pushBatch(ClassId, Batches.back()); + Batches.pop_back(); + } + Cache.destroy(nullptr); + Allocator.releaseToOS(); + Allocator.printStats(); + EXPECT_EQ(AllocationFailed, true); +} + +template static void testIteratePrimary() { + std::unique_ptr Allocator(new Primary); + Allocator->init(/*ReleaseToOsInterval=*/-1); + typename Primary::CacheT Cache; + Cache.init(nullptr, Allocator.get()); + std::vector> V; + for (scudo::uptr I = 0; I < 64U; I++) { + const scudo::uptr Size = std::rand() % Primary::SizeClassMap::MaxSize; + const scudo::uptr ClassId = Primary::SizeClassMap::getClassIdBySize(Size); + void *P = Cache.allocate(ClassId); + V.push_back(std::make_pair(ClassId, P)); + } + scudo::uptr Found = 0; + auto Lambda = [V, &Found](scudo::uptr Block) { + for (const auto &Pair : V) { + if (Pair.second == reinterpret_cast(Block)) + Found++; + } + }; + Allocator->disable(); + Allocator->iterateOverBlocks(Lambda); + Allocator->enable(); + EXPECT_EQ(Found, V.size()); + while (!V.empty()) { + auto Pair = V.back(); + Cache.deallocate(Pair.first, Pair.second); + V.pop_back(); + } + Cache.destroy(nullptr); + Allocator->releaseToOS(); + Allocator->printStats(); +} + +TEST(ScudoPrimaryTest, PrimaryIterate) { + using SizeClassMap = scudo::DefaultSizeClassMap; + testIteratePrimary>(); + testIteratePrimary>(); +} + +static std::mutex Mutex; +static std::condition_variable Cv; +static bool Ready = false; + +template static void performAllocations(Primary *Allocator) { + static THREADLOCAL typename Primary::CacheT Cache; + Cache.init(nullptr, Allocator); + std::vector> V; + { + std::unique_lock Lock(Mutex); + while (!Ready) + Cv.wait(Lock); + } + for (scudo::uptr I = 0; I < 256U; I++) { + const scudo::uptr Size = std::rand() % Primary::SizeClassMap::MaxSize; + const scudo::uptr ClassId = Primary::SizeClassMap::getClassIdBySize(Size); + void *P = Cache.allocate(ClassId); + V.push_back(std::make_pair(ClassId, P)); + } + while (!V.empty()) { + auto Pair = V.back(); + Cache.deallocate(Pair.first, Pair.second); + V.pop_back(); + } + Cache.destroy(nullptr); +} + +template static void testPrimaryThreaded() { + std::unique_ptr Allocator(new Primary); + Allocator->init(/*ReleaseToOsInterval=*/-1); + std::thread Threads[10]; + for (scudo::uptr I = 0; I < 10U; I++) + Threads[I] = std::thread(performAllocations, Allocator.get()); + { + std::unique_lock Lock(Mutex); + Ready = true; + Cv.notify_all(); + } + for (auto &T : Threads) + T.join(); + Allocator->releaseToOS(); + Allocator->printStats(); +} + +TEST(ScudoPrimaryTest, PrimaryThreaded) { + using SizeClassMap = scudo::SvelteSizeClassMap; + testPrimaryThreaded>(); + testPrimaryThreaded>(); +} Index: lib/scudo/standalone/tests/secondary_test.cc =================================================================== --- lib/scudo/standalone/tests/secondary_test.cc +++ lib/scudo/standalone/tests/secondary_test.cc @@ -38,7 +38,7 @@ L->deallocate(P); std::vector V; - for (scudo::u8 I = 0; I < 32; I++) + for (scudo::uptr I = 0; I < 32U; I++) V.push_back(L->allocate(Size)); std::random_shuffle(V.begin(), V.end()); while (!V.empty()) { @@ -84,7 +84,7 @@ L->init(nullptr); std::vector V; const scudo::uptr PageSize = scudo::getPageSizeCached(); - for (scudo::u8 I = 0; I < 32; I++) + for (scudo::uptr I = 0; I < 32U; I++) V.push_back(L->allocate((std::rand() % 16) * PageSize)); auto Lambda = [V](scudo::uptr Block) { EXPECT_NE(std::find(V.begin(), V.end(), reinterpret_cast(Block)), @@ -100,19 +100,19 @@ L->printStats(); } -std::mutex Mutex; -std::condition_variable Cv; -bool Ready = false; +static std::mutex Mutex; +static std::condition_variable Cv; +static bool Ready = false; static void performAllocations(scudo::MapAllocator *L) { + std::vector V; + const scudo::uptr PageSize = scudo::getPageSizeCached(); { std::unique_lock Lock(Mutex); while (!Ready) Cv.wait(Lock); } - std::vector V; - const scudo::uptr PageSize = scudo::getPageSizeCached(); - for (scudo::u8 I = 0; I < 32; I++) + for (scudo::uptr I = 0; I < 32U; I++) V.push_back(L->allocate((std::rand() % 16) * PageSize)); while (!V.empty()) { L->deallocate(V.back()); @@ -124,7 +124,7 @@ scudo::MapAllocator *L = new scudo::MapAllocator; L->init(nullptr); std::thread Threads[10]; - for (scudo::uptr I = 0; I < 10; I++) + for (scudo::uptr I = 0; I < 10U; I++) Threads[I] = std::thread(performAllocations, L); { std::unique_lock Lock(Mutex);