[compiler-rt] 0dbd804 - [scudo] Only init RingBuffer when needed. (#85994)
via llvm-commits
llvm-commits at lists.llvm.org
Fri Mar 29 09:44:20 PDT 2024
Author: Christopher Ferris
Date: 2024-03-29T09:44:17-07:00
New Revision: 0dbd804a690720688d8234d8bdaee8f8f4fdcddc
URL: https://github.com/llvm/llvm-project/commit/0dbd804a690720688d8234d8bdaee8f8f4fdcddc
DIFF: https://github.com/llvm/llvm-project/commit/0dbd804a690720688d8234d8bdaee8f8f4fdcddc.diff
LOG: [scudo] Only init RingBuffer when needed. (#85994)
Only attempt to initialize the ring buffer when tracking is enabled.
Updated unit tests, and added a few new unit tests to verify the
RingBuffer is not initialized by default.
Verified that the two maps associated with the RingBuffer are not
created in processes by default.
Added:
Modified:
compiler-rt/lib/scudo/standalone/combined.h
compiler-rt/lib/scudo/standalone/tests/combined_test.cpp
Removed:
################################################################################
diff --git a/compiler-rt/lib/scudo/standalone/combined.h b/compiler-rt/lib/scudo/standalone/combined.h
index f4dd90aac66555..e7bc90cd0960ed 100644
--- a/compiler-rt/lib/scudo/standalone/combined.h
+++ b/compiler-rt/lib/scudo/standalone/combined.h
@@ -18,6 +18,7 @@
#include "local_cache.h"
#include "mem_map.h"
#include "memtag.h"
+#include "mutex.h"
#include "options.h"
#include "quarantine.h"
#include "report.h"
@@ -178,17 +179,17 @@ class Allocator {
Quarantine.init(
static_cast<uptr>(getFlags()->quarantine_size_kb << 10),
static_cast<uptr>(getFlags()->thread_local_quarantine_size_kb << 10));
-
- mapAndInitializeRingBuffer();
}
- void enableRingBuffer() {
+ void enableRingBuffer() NO_THREAD_SAFETY_ANALYSIS {
AllocationRingBuffer *RB = getRingBuffer();
if (RB)
RB->Depot->enable();
+ RingBufferInitLock.unlock();
}
- void disableRingBuffer() {
+ void disableRingBuffer() NO_THREAD_SAFETY_ANALYSIS {
+ RingBufferInitLock.lock();
AllocationRingBuffer *RB = getRingBuffer();
if (RB)
RB->Depot->disable();
@@ -915,9 +916,11 @@ class Allocator {
DCHECK(!Primary.Options.load().get(OptionBit::TrackAllocationStacks));
return;
}
- if (Track)
+
+ if (Track) {
+ initRingBufferMaybe();
Primary.Options.set(OptionBit::TrackAllocationStacks);
- else
+ } else
Primary.Options.clear(OptionBit::TrackAllocationStacks);
}
@@ -1092,6 +1095,9 @@ class Allocator {
0,
"invalid alignment");
+ // Lock to initialize the RingBuffer
+ HybridMutex RingBufferInitLock;
+
// Pointer to memory mapped area starting with AllocationRingBuffer struct,
// and immediately followed by Size elements of type Entry.
atomic_uptr RingBufferAddress = {};
@@ -1546,11 +1552,16 @@ class Allocator {
RBEntryStart)[N];
}
- void mapAndInitializeRingBuffer() {
- if (getFlags()->allocation_ring_buffer_size <= 0)
+ void initRingBufferMaybe() {
+ ScopedLock L(RingBufferInitLock);
+ if (getRingBuffer() != nullptr)
return;
- u32 AllocationRingBufferSize =
- static_cast<u32>(getFlags()->allocation_ring_buffer_size);
+
+ int ring_buffer_size = getFlags()->allocation_ring_buffer_size;
+ if (ring_buffer_size <= 0)
+ return;
+
+ u32 AllocationRingBufferSize = static_cast<u32>(ring_buffer_size);
// We store alloc and free stacks for each entry.
constexpr u32 kStacksPerRingBufferEntry = 2;
diff --git a/compiler-rt/lib/scudo/standalone/tests/combined_test.cpp b/compiler-rt/lib/scudo/standalone/tests/combined_test.cpp
index 6a311adc55e4bd..1a36155bcd423a 100644
--- a/compiler-rt/lib/scudo/standalone/tests/combined_test.cpp
+++ b/compiler-rt/lib/scudo/standalone/tests/combined_test.cpp
@@ -867,32 +867,86 @@ SCUDO_TYPED_TEST(ScudoCombinedTest, ReallocateInPlaceStress) {
}
}
+SCUDO_TYPED_TEST(ScudoCombinedTest, RingBufferDefaultDisabled) {
+ // The RingBuffer is not initialized until tracking is enabled for the
+ // first time.
+ auto *Allocator = this->Allocator.get();
+ EXPECT_EQ(0u, Allocator->getRingBufferSize());
+ EXPECT_EQ(nullptr, Allocator->getRingBufferAddress());
+}
+
+SCUDO_TYPED_TEST(ScudoCombinedTest, RingBufferInitOnce) {
+ auto *Allocator = this->Allocator.get();
+ Allocator->setTrackAllocationStacks(true);
+
+ auto RingBufferSize = Allocator->getRingBufferSize();
+ ASSERT_GT(RingBufferSize, 0u);
+ auto *RingBufferAddress = Allocator->getRingBufferAddress();
+ EXPECT_NE(nullptr, RingBufferAddress);
+
+ // Enable tracking again to verify that the initialization only happens once.
+ Allocator->setTrackAllocationStacks(true);
+ ASSERT_EQ(RingBufferSize, Allocator->getRingBufferSize());
+ EXPECT_EQ(RingBufferAddress, Allocator->getRingBufferAddress());
+}
+
SCUDO_TYPED_TEST(ScudoCombinedTest, RingBufferSize) {
auto *Allocator = this->Allocator.get();
- auto Size = Allocator->getRingBufferSize();
- ASSERT_GT(Size, 0u);
- EXPECT_EQ(Allocator->getRingBufferAddress()[Size - 1], '\0');
+ Allocator->setTrackAllocationStacks(true);
+
+ auto RingBufferSize = Allocator->getRingBufferSize();
+ ASSERT_GT(RingBufferSize, 0u);
+ EXPECT_EQ(Allocator->getRingBufferAddress()[RingBufferSize - 1], '\0');
}
SCUDO_TYPED_TEST(ScudoCombinedTest, RingBufferAddress) {
auto *Allocator = this->Allocator.get();
- auto *Addr = Allocator->getRingBufferAddress();
- EXPECT_NE(Addr, nullptr);
- EXPECT_EQ(Addr, Allocator->getRingBufferAddress());
+ Allocator->setTrackAllocationStacks(true);
+
+ auto *RingBufferAddress = Allocator->getRingBufferAddress();
+ EXPECT_NE(RingBufferAddress, nullptr);
+ EXPECT_EQ(RingBufferAddress, Allocator->getRingBufferAddress());
+}
+
+SCUDO_TYPED_TEST(ScudoCombinedTest, StackDepotDefaultDisabled) {
+ // The StackDepot is not initialized until tracking is enabled for the
+ // first time.
+ auto *Allocator = this->Allocator.get();
+ EXPECT_EQ(0u, Allocator->getStackDepotSize());
+ EXPECT_EQ(nullptr, Allocator->getStackDepotAddress());
+}
+
+SCUDO_TYPED_TEST(ScudoCombinedTest, StackDepotInitOnce) {
+ auto *Allocator = this->Allocator.get();
+ Allocator->setTrackAllocationStacks(true);
+
+ auto StackDepotSize = Allocator->getStackDepotSize();
+ EXPECT_GT(StackDepotSize, 0u);
+ auto *StackDepotAddress = Allocator->getStackDepotAddress();
+ EXPECT_NE(nullptr, StackDepotAddress);
+
+ // Enable tracking again to verify that the initialization only happens once.
+ Allocator->setTrackAllocationStacks(true);
+ EXPECT_EQ(StackDepotSize, Allocator->getStackDepotSize());
+ EXPECT_EQ(StackDepotAddress, Allocator->getStackDepotAddress());
}
SCUDO_TYPED_TEST(ScudoCombinedTest, StackDepotSize) {
auto *Allocator = this->Allocator.get();
- auto Size = Allocator->getStackDepotSize();
- ASSERT_GT(Size, 0u);
- EXPECT_EQ(Allocator->getStackDepotAddress()[Size - 1], '\0');
+ Allocator->setTrackAllocationStacks(true);
+
+ auto StackDepotSize = Allocator->getStackDepotSize();
+ EXPECT_GT(StackDepotSize, 0u);
+ EXPECT_EQ(Allocator->getStackDepotAddress()[StackDepotSize - 1], '\0');
}
SCUDO_TYPED_TEST(ScudoCombinedTest, StackDepotAddress) {
auto *Allocator = this->Allocator.get();
- auto *Addr = Allocator->getStackDepotAddress();
- EXPECT_NE(Addr, nullptr);
- EXPECT_EQ(Addr, Allocator->getStackDepotAddress());
+ Allocator->setTrackAllocationStacks(true);
+
+ auto *StackDepotAddress = Allocator->getStackDepotAddress();
+ EXPECT_NE(StackDepotAddress, nullptr);
+ EXPECT_EQ(StackDepotAddress, Allocator->getStackDepotAddress());
}
SCUDO_TYPED_TEST(ScudoCombinedTest, StackDepot) {
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