Than Ngo
2 months ago
parent
7187ed89f5
commit
ada748216c
@ -1,127 +0,0 @@
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diff -up chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_bucket.h.orig chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_bucket.h
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--- chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_bucket.h.orig 2024-04-12 21:56:54.000000000 +0200
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+++ chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_bucket.h 2024-04-14 20:53:16.043867871 +0200
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@@ -147,7 +147,13 @@ struct PartitionBucket {
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// Returns a slot number starting from the beginning of the slot span.
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PA_ALWAYS_INLINE size_t GetSlotNumber(size_t offset_in_slot_span) const {
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// See the static assertion for `kReciprocalShift` above.
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- PA_DCHECK(offset_in_slot_span <= kMaxBucketed);
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+ // TODO(casey.smalley@arm.com): triggers on Aarch64/Linux
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+ // systems with 64k system pages. Constants need to be
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+ // adjusted to prevent different parts of the allocator
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+ // from overlapping. For now this will allow 64k pages
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+ // to function on Aarch64/Linux systems, albeit not
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+ // very efficiently.
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+ PA_DCHECK(internal::SystemPageSize() == (size_t{1} << 16) || offset_in_slot_span <= kMaxBucketed);
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PA_DCHECK(slot_size <= kMaxBucketed);
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const size_t offset_in_slot =
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diff -up chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_page_constants.h.orig chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_page_constants.h
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--- chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_page_constants.h.orig 2024-04-14 20:53:16.043867871 +0200
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+++ chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_page_constants.h 2024-04-14 21:39:18.147052845 +0200
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@@ -17,10 +17,8 @@ namespace partition_alloc::internal {
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// PartitionPageSize() is 4 times the OS page size.
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static constexpr size_t kMaxSlotsPerSlotSpan = 4 * (1 << 14) / kSmallestBucket;
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#elif defined(PARTITION_ALLOCATOR_CONSTANTS_POSIX_NONCONST_PAGE_SIZE)
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-// System page size can be 4, 16, or 64 kiB on Linux on arm64. 64 kiB is
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-// currently (kMaxSlotsPerSlotSpanBits == 13) not supported by the code,
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-// so we use the 16 kiB maximum (64 kiB will crash).
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-static constexpr size_t kMaxSlotsPerSlotSpan = 4 * (1 << 14) / kSmallestBucket;
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+// System page size can be 4, 16, or 64 kiB on Linux on AArch64.
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+static constexpr size_t kMaxSlotsPerSlotSpan = 4 * (1 << 16) / kSmallestBucket;
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#else
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// A slot span can "span" multiple PartitionPages, but then its slot size is
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// larger, so it doesn't have as many slots.
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diff -up chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_root.cc.orig chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_root.cc
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--- chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_root.cc.orig 2024-04-14 20:53:16.044867889 +0200
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+++ chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_root.cc 2024-04-14 21:50:57.926716718 +0200
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@@ -952,12 +952,11 @@ void PartitionRoot::Init(PartitionOption
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(internal::SystemPageSize() == (size_t{1} << 14)));
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#elif BUILDFLAG(IS_LINUX) && defined(ARCH_CPU_ARM64)
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// Check runtime pagesize. Though the code is currently the same, it is
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- // not merged with the IS_APPLE case above as a 1 << 16 case needs to be
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- // added here in the future, to allow 64 kiB pagesize. That is only
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- // supported on Linux on arm64, not on IS_APPLE, but not yet present here
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- // as the rest of the PartitionAlloc does not currently support it.
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+ // not merged with the IS_APPLE case above as a 1 << 16 case is only
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+ // supported on Linux on AArch64.
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PA_CHECK((internal::SystemPageSize() == (size_t{1} << 12)) ||
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- (internal::SystemPageSize() == (size_t{1} << 14)));
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+ (internal::SystemPageSize() == (size_t{1} << 14)) ||
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+ (internal::SystemPageSize() == (size_t{1} << 16)));
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#endif
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::partition_alloc::internal::ScopedGuard guard{lock_};
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diff -up chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_page.h.me chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_page.h
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--- chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_page.h.me 2024-04-14 22:08:40.655011536 +0200
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+++ chromium-124.0.6367.49/base/allocator/partition_allocator/src/partition_alloc/partition_page.h 2024-04-14 22:12:46.665731577 +0200
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@@ -86,27 +86,25 @@ struct SlotSpanMetadata {
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// CHECK()ed in AllocNewSlotSpan().
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// The maximum number of bits needed to cover all currently supported OSes.
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- static constexpr size_t kMaxSlotsPerSlotSpanBits = 13;
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+ static constexpr size_t kMaxSlotsPerSlotSpanBits = 15;
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static_assert(kMaxSlotsPerSlotSpan < (1 << kMaxSlotsPerSlotSpanBits), "");
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- // |marked_full| isn't equivalent to being full. Slot span is marked as full
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- // iff it isn't on the active slot span list (or any other list).
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- uint32_t marked_full : 1;
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// |num_allocated_slots| is 0 for empty or decommitted slot spans, which can
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// be further differentiated by checking existence of the freelist.
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- uint32_t num_allocated_slots : kMaxSlotsPerSlotSpanBits;
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- uint32_t num_unprovisioned_slots : kMaxSlotsPerSlotSpanBits;
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+ uint16_t num_allocated_slots : kMaxSlotsPerSlotSpanBits;
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+ uint16_t num_unprovisioned_slots : kMaxSlotsPerSlotSpanBits;
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+
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+ // |marked_full| isn't equivalent to being full. Slot span is marked as full
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+ // iff it isn't on the active slot span list (or any other list).
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+ bool marked_full : 1;
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private:
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- const uint32_t can_store_raw_size_ : 1;
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- uint32_t freelist_is_sorted_ : 1;
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- uint32_t unused1_ : (32 - 1 - 2 * kMaxSlotsPerSlotSpanBits - 1 - 1);
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+ const uint8_t can_store_raw_size_ : 1;
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+ uint8_t freelist_is_sorted_ : 1;
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// If |in_empty_cache_|==1, |empty_cache_index| is undefined and mustn't be
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// used.
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- uint16_t in_empty_cache_ : 1;
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- uint16_t empty_cache_index_
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- : kMaxEmptyCacheIndexBits; // < kMaxFreeableSpans.
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- uint16_t unused2_ : (16 - 1 - kMaxEmptyCacheIndexBits);
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+ bool in_empty_cache_ : 1;
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+ uint8_t empty_cache_index_ : kMaxEmptyCacheIndexBits; // < kMaxFreeableSpans.
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// Can use only 48 bits (6B) in this bitfield, as this structure is embedded
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// in PartitionPage which has 2B worth of fields and must fit in 32B.
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@@ -246,18 +244,13 @@ static_assert(sizeof(SlotSpanMetadata) <
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"SlotSpanMetadata must fit into a Page Metadata slot.");
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inline constexpr SlotSpanMetadata::SlotSpanMetadata() noexcept
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- : marked_full(0),
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- num_allocated_slots(0),
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+ : num_allocated_slots(0),
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num_unprovisioned_slots(0),
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+ marked_full(0),
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can_store_raw_size_(false),
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freelist_is_sorted_(true),
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- unused1_(0),
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in_empty_cache_(0),
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- empty_cache_index_(0),
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- unused2_(0) {
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- (void)unused1_;
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- (void)unused2_;
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-}
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+ empty_cache_index_(0) {}
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inline SlotSpanMetadata::SlotSpanMetadata(const SlotSpanMetadata&) = default;
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@@ -752,7 +745,7 @@ PA_ALWAYS_INLINE void SlotSpanMetadata::
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size_t num_slots_per_span = bucket->get_slots_per_span();
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PA_DCHECK(num_slots_per_span <= kMaxSlotsPerSlotSpan);
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- num_unprovisioned_slots = static_cast<uint32_t>(num_slots_per_span);
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+ num_unprovisioned_slots = static_cast<uint16_t>(num_slots_per_span);
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PA_DCHECK(num_unprovisioned_slots);
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ToSuperPageExtent()->IncrementNumberOfNonemptySlotSpans();
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