-
Notifications
You must be signed in to change notification settings - Fork 13.6k
Revert "[scudo] Separated committed and decommitted entries." #101375
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This reverts commit 8b2688b.
@llvm/pr-subscribers-compiler-rt-sanitizer Author: None (ChiaHungDuan) ChangesReverts llvm/llvm-project#100818 Full diff: https://github.com/llvm/llvm-project/pull/101375.diff 1 Files Affected:
diff --git a/compiler-rt/lib/scudo/standalone/secondary.h b/compiler-rt/lib/scudo/standalone/secondary.h
index 0f0c4ca3a197b..d8505742d6054 100644
--- a/compiler-rt/lib/scudo/standalone/secondary.h
+++ b/compiler-rt/lib/scudo/standalone/secondary.h
@@ -180,14 +180,6 @@ template <typename T> class NonZeroLengthArray<T, 0> {
template <typename Config> class MapAllocatorCache {
public:
- typedef enum { COMMITTED = 0, DECOMMITTED = 1, NONE } EntryListT;
-
- // TODO: Refactor the intrusive list to support non-pointer link type
- typedef struct {
- u16 Head;
- u16 Tail;
- } ListInfo;
-
void getStats(ScopedString *Str) {
ScopedLock L(Mutex);
uptr Integral;
@@ -205,18 +197,13 @@ template <typename Config> class MapAllocatorCache {
SuccessfulRetrieves, CallsToRetrieve, Integral, Fractional);
Str->append("Cache Entry Info (Most Recent -> Least Recent):\n");
- auto printList = [&](EntryListT ListType) REQUIRES(Mutex) {
- for (u32 I = EntryLists[ListType].Head; I != CachedBlock::InvalidEntry;
- I = Entries[I].Next) {
- CachedBlock &Entry = Entries[I];
- Str->append(" StartBlockAddress: 0x%zx, EndBlockAddress: 0x%zx, "
- "BlockSize: %zu %s\n",
- Entry.CommitBase, Entry.CommitBase + Entry.CommitSize,
- Entry.CommitSize, Entry.Time == 0 ? "[R]" : "");
- }
- };
- printList(COMMITTED);
- printList(DECOMMITTED);
+ for (u32 I = LRUHead; I != CachedBlock::InvalidEntry; I = Entries[I].Next) {
+ CachedBlock &Entry = Entries[I];
+ Str->append(" StartBlockAddress: 0x%zx, EndBlockAddress: 0x%zx, "
+ "BlockSize: %zu %s\n",
+ Entry.CommitBase, Entry.CommitBase + Entry.CommitSize,
+ Entry.CommitSize, Entry.Time == 0 ? "[R]" : "");
+ }
}
// Ensure the default maximum specified fits the array.
@@ -240,10 +227,8 @@ template <typename Config> class MapAllocatorCache {
setOption(Option::ReleaseInterval, static_cast<sptr>(ReleaseToOsInterval));
// The cache is initially empty
- EntryLists[COMMITTED].Head = CachedBlock::InvalidEntry;
- EntryLists[COMMITTED].Tail = CachedBlock::InvalidEntry;
- EntryLists[DECOMMITTED].Head = CachedBlock::InvalidEntry;
- EntryLists[DECOMMITTED].Tail = CachedBlock::InvalidEntry;
+ LRUHead = CachedBlock::InvalidEntry;
+ LRUTail = CachedBlock::InvalidEntry;
// Available entries will be retrieved starting from the beginning of the
// Entries array
@@ -325,19 +310,15 @@ template <typename Config> class MapAllocatorCache {
// All excess entries are evicted from the cache
while (needToEvict()) {
// Save MemMaps of evicted entries to perform unmap outside of lock
- EntryListT EvictionListType;
- if (EntryLists[DECOMMITTED].Tail == CachedBlock::InvalidEntry)
- EvictionListType = COMMITTED;
- else
- EvictionListType = DECOMMITTED;
- remove(EntryLists[EvictionListType].Tail, EvictionListType);
+ EvictionMemMaps.push_back(Entries[LRUTail].MemMap);
+ remove(LRUTail);
}
- insert(Entry, (Entry.Time == 0) ? DECOMMITTED : COMMITTED);
+ insert(Entry);
if (OldestTime == 0)
OldestTime = Entry.Time;
- } while (0); // ScopedLock L(Mutex);
+ } while (0);
for (MemMapT &EvictMemMap : EvictionMemMaps)
EvictMemMap.unmap(EvictMemMap.getBase(), EvictMemMap.getCapacity());
@@ -354,69 +335,56 @@ template <typename Config> class MapAllocatorCache {
// 10% of the requested size proved to be the optimal choice for
// retrieving cached blocks after testing several options.
constexpr u32 FragmentedBytesDivisor = 10;
+ bool Found = false;
CachedBlock Entry;
uptr EntryHeaderPos = 0;
- uptr OptimalFitIndex = CachedBlock::InvalidEntry;
{
ScopedLock L(Mutex);
CallsToRetrieve++;
if (EntriesCount == 0)
return false;
+ u32 OptimalFitIndex = 0;
uptr MinDiff = UINTPTR_MAX;
- EntryListT OptimalFitListType = NONE;
- auto FindAvailableEntry = [&](EntryListT ListType) REQUIRES(Mutex) {
- for (uptr I = EntryLists[ListType].Head; I != CachedBlock::InvalidEntry;
- I = Entries[I].Next) {
- const uptr CommitBase = Entries[I].CommitBase;
- const uptr CommitSize = Entries[I].CommitSize;
- const uptr AllocPos =
- roundDown(CommitBase + CommitSize - Size, Alignment);
- const uptr HeaderPos = AllocPos - HeadersSize;
- if (HeaderPos > CommitBase + CommitSize)
- continue;
- if (HeaderPos < CommitBase ||
- AllocPos > CommitBase + PageSize * MaxUnusedCachePages)
- continue;
-
- const uptr Diff = HeaderPos - CommitBase;
- // immediately use a cached block if it's size is close enough to
- // the requested size.
- const uptr MaxAllowedFragmentedBytes =
- (CommitBase + CommitSize - HeaderPos) / FragmentedBytesDivisor;
- if (Diff <= MaxAllowedFragmentedBytes) {
- OptimalFitIndex = I;
- EntryHeaderPos = HeaderPos;
- OptimalFitListType = ListType;
- return Entries[OptimalFitIndex];
- }
-
- // keep track of the smallest cached block
- // that is greater than (AllocSize + HeaderSize)
- if (Diff > MinDiff)
- continue;
+ for (u32 I = LRUHead; I != CachedBlock::InvalidEntry;
+ I = Entries[I].Next) {
+ const uptr CommitBase = Entries[I].CommitBase;
+ const uptr CommitSize = Entries[I].CommitSize;
+ const uptr AllocPos =
+ roundDown(CommitBase + CommitSize - Size, Alignment);
+ const uptr HeaderPos = AllocPos - HeadersSize;
+ if (HeaderPos > CommitBase + CommitSize)
+ continue;
+ if (HeaderPos < CommitBase ||
+ AllocPos > CommitBase + PageSize * MaxUnusedCachePages) {
+ continue;
+ }
+ Found = true;
+ const uptr Diff = HeaderPos - CommitBase;
+ // immediately use a cached block if it's size is close enough to the
+ // requested size.
+ const uptr MaxAllowedFragmentedBytes =
+ (CommitBase + CommitSize - HeaderPos) / FragmentedBytesDivisor;
+ if (Diff <= MaxAllowedFragmentedBytes) {
OptimalFitIndex = I;
- MinDiff = Diff;
- OptimalFitListType = ListType;
EntryHeaderPos = HeaderPos;
+ break;
}
- CachedBlock FoundEntry;
- if (OptimalFitIndex != CachedBlock::InvalidEntry)
- FoundEntry = Entries[OptimalFitIndex];
- return FoundEntry;
- };
-
- // Prioritize valid fit from COMMITTED entries over
- // optimal fit from DECOMMITTED entries
- Entry = FindAvailableEntry(COMMITTED);
- if (!Entry.isValid())
- Entry = FindAvailableEntry(DECOMMITTED);
-
- if (!Entry.isValid())
- return false;
-
- remove(OptimalFitIndex, OptimalFitListType);
- SuccessfulRetrieves++;
- } // ScopedLock L(Mutex);
+ // keep track of the smallest cached block
+ // that is greater than (AllocSize + HeaderSize)
+ if (Diff > MinDiff)
+ continue;
+ OptimalFitIndex = I;
+ MinDiff = Diff;
+ EntryHeaderPos = HeaderPos;
+ }
+ if (Found) {
+ Entry = Entries[OptimalFitIndex];
+ remove(OptimalFitIndex);
+ SuccessfulRetrieves++;
+ }
+ }
+ if (!Found)
+ return false;
*H = reinterpret_cast<LargeBlock::Header *>(
LargeBlock::addHeaderTag<Config>(EntryHeaderPos));
@@ -480,15 +448,10 @@ template <typename Config> class MapAllocatorCache {
Quarantine[I].invalidate();
}
}
- auto disableLists = [&](EntryListT EntryList) REQUIRES(Mutex) {
- for (u32 I = EntryLists[COMMITTED].Head; I != CachedBlock::InvalidEntry;
- I = Entries[I].Next) {
- Entries[I].MemMap.setMemoryPermission(Entries[I].CommitBase,
- Entries[I].CommitSize, 0);
- }
- };
- disableLists(COMMITTED);
- disableLists(DECOMMITTED);
+ for (u32 I = LRUHead; I != CachedBlock::InvalidEntry; I = Entries[I].Next) {
+ Entries[I].MemMap.setMemoryPermission(Entries[I].CommitBase,
+ Entries[I].CommitSize, 0);
+ }
QuarantinePos = -1U;
}
@@ -503,7 +466,7 @@ template <typename Config> class MapAllocatorCache {
return (EntriesCount >= atomic_load_relaxed(&MaxEntriesCount));
}
- void insert(const CachedBlock &Entry, EntryListT ListType) REQUIRES(Mutex) {
+ void insert(const CachedBlock &Entry) REQUIRES(Mutex) {
DCHECK_LT(EntriesCount, atomic_load_relaxed(&MaxEntriesCount));
// Cache should be populated with valid entries when not empty
@@ -512,92 +475,71 @@ template <typename Config> class MapAllocatorCache {
u32 FreeIndex = AvailableHead;
AvailableHead = Entries[AvailableHead].Next;
+ if (EntriesCount == 0) {
+ LRUTail = static_cast<u16>(FreeIndex);
+ } else {
+ // Check list order
+ if (EntriesCount > 1)
+ DCHECK_GE(Entries[LRUHead].Time, Entries[Entries[LRUHead].Next].Time);
+ Entries[LRUHead].Prev = static_cast<u16>(FreeIndex);
+ }
+
Entries[FreeIndex] = Entry;
- pushFront(FreeIndex, ListType);
+ Entries[FreeIndex].Next = LRUHead;
+ Entries[FreeIndex].Prev = CachedBlock::InvalidEntry;
+ LRUHead = static_cast<u16>(FreeIndex);
EntriesCount++;
- if (Entries[EntryLists[ListType].Head].Next != CachedBlock::InvalidEntry) {
- DCHECK_GE(Entries[EntryLists[ListType].Head].Time,
- Entries[Entries[EntryLists[ListType].Head].Next].Time);
- }
// Availability stack should not have available entries when all entries
// are in use
if (EntriesCount == Config::getEntriesArraySize())
DCHECK_EQ(AvailableHead, CachedBlock::InvalidEntry);
}
- // Joins the entries adjacent to Entries[I], effectively
- // unlinking Entries[I] from the list
- void unlink(uptr I, EntryListT ListType) REQUIRES(Mutex) {
- if (I == EntryLists[ListType].Head)
- EntryLists[ListType].Head = Entries[I].Next;
+ void remove(uptr I) REQUIRES(Mutex) {
+ DCHECK(Entries[I].isValid());
+
+ Entries[I].invalidate();
+
+ if (I == LRUHead)
+ LRUHead = Entries[I].Next;
else
Entries[Entries[I].Prev].Next = Entries[I].Next;
- if (I == EntryLists[ListType].Tail)
- EntryLists[ListType].Tail = Entries[I].Prev;
+ if (I == LRUTail)
+ LRUTail = Entries[I].Prev;
else
Entries[Entries[I].Next].Prev = Entries[I].Prev;
- }
- // Invalidates Entries[I], removes Entries[I] from list, and pushes
- // Entries[I] onto the stack of available entries
- void remove(uptr I, EntryListT ListType) REQUIRES(Mutex) {
- DCHECK(Entries[I].isValid());
-
- Entries[I].invalidate();
-
- unlink(I, ListType);
Entries[I].Next = AvailableHead;
AvailableHead = static_cast<u16>(I);
EntriesCount--;
// Cache should not have valid entries when not empty
if (EntriesCount == 0) {
- DCHECK_EQ(EntryLists[COMMITTED].Head, CachedBlock::InvalidEntry);
- DCHECK_EQ(EntryLists[COMMITTED].Tail, CachedBlock::InvalidEntry);
- DCHECK_EQ(EntryLists[DECOMMITTED].Head, CachedBlock::InvalidEntry);
- DCHECK_EQ(EntryLists[DECOMMITTED].Tail, CachedBlock::InvalidEntry);
+ DCHECK_EQ(LRUHead, CachedBlock::InvalidEntry);
+ DCHECK_EQ(LRUTail, CachedBlock::InvalidEntry);
}
}
- inline void pushFront(uptr I, EntryListT ListType) REQUIRES(Mutex) {
- if (EntryLists[ListType].Tail == CachedBlock::InvalidEntry)
- EntryLists[ListType].Tail = static_cast<u16>(I);
- else
- Entries[EntryLists[ListType].Head].Prev = static_cast<u16>(I);
-
- Entries[I].Next = EntryLists[ListType].Head;
- Entries[I].Prev = CachedBlock::InvalidEntry;
- EntryLists[ListType].Head = static_cast<u16>(I);
- }
-
void empty() {
MemMapT MapInfo[Config::getEntriesArraySize()];
uptr N = 0;
{
ScopedLock L(Mutex);
- auto emptyList = [&](EntryListT ListType) REQUIRES(Mutex) {
- for (uptr I = EntryLists[ListType].Head;
- I != CachedBlock::InvalidEntry;) {
- uptr ToRemove = I;
- I = Entries[I].Next;
- MapInfo[N] = Entries[ToRemove].MemMap;
- remove(ToRemove, ListType);
- N++;
- }
- };
- emptyList(COMMITTED);
- emptyList(DECOMMITTED);
+ for (uptr I = 0; I < Config::getEntriesArraySize(); I++) {
+ if (!Entries[I].isValid())
+ continue;
+ MapInfo[N] = Entries[I].MemMap;
+ remove(I);
+ N++;
+ }
EntriesCount = 0;
}
for (uptr I = 0; I < N; I++) {
MemMapT &MemMap = MapInfo[I];
MemMap.unmap(MemMap.getBase(), MemMap.getCapacity());
}
-
- for (uptr I = 0; I < Config::getEntriesArraySize(); I++)
- DCHECK(!Entries[I].isValid());
}
void releaseIfOlderThan(CachedBlock &Entry, u64 Time) REQUIRES(Mutex) {
@@ -619,13 +561,8 @@ template <typename Config> class MapAllocatorCache {
OldestTime = 0;
for (uptr I = 0; I < Config::getQuarantineSize(); I++)
releaseIfOlderThan(Quarantine[I], Time);
- for (uptr I = 0; I < Config::getEntriesArraySize(); I++) {
- if (Entries[I].isValid() && Entries[I].Time && Entries[I].Time <= Time) {
- unlink(I, COMMITTED);
- pushFront(I, DECOMMITTED);
- }
+ for (uptr I = 0; I < Config::getEntriesArraySize(); I++)
releaseIfOlderThan(Entries[I], Time);
- }
}
HybridMutex Mutex;
@@ -642,12 +579,10 @@ template <typename Config> class MapAllocatorCache {
NonZeroLengthArray<CachedBlock, Config::getQuarantineSize()>
Quarantine GUARDED_BY(Mutex) = {};
- // EntryLists stores the head and tail indices of all
- // lists being used to store valid cache entries.
- // Currently there are lists storing COMMITTED and DECOMMITTED entries.
- // COMMITTED entries are those that are not madvise()'d
- // DECOMMITTED entries are those that are madvise()'d
- ListInfo EntryLists[2] GUARDED_BY(Mutex) = {};
+ // The LRUHead of the cache is the most recently used cache entry
+ u16 LRUHead GUARDED_BY(Mutex) = 0;
+ // The LRUTail of the cache is the least recently used cache entry
+ u16 LRUTail GUARDED_BY(Mutex) = 0;
// The AvailableHead is the top of the stack of available entries
u16 AvailableHead GUARDED_BY(Mutex) = 0;
};
|
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Reverts #100818