weaselab/conflict-set
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Code Issues 4 Packages Releases 13 Activity

Use deferred release instead of hacky dontInvalidate logic

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This commit is contained in:
Andrew Noyes
2024-10-30 14:16:36 -07:00
parent b6bfc6f48d
commit 4e685bbc3b
1 changed files with 32 additions and 28 deletions
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60
ConflictSet.cpp
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@@ -1849,7 +1849,7 @@ void freeAndMakeCapacityAtLeast(Node *&self, int capacity,
newSelf->copyChildrenAndKeyFrom(*self0);
getInTree(self, impl) = newSelf;
if (kUseFreeList) {
writeContext->release(self0);
writeContext->deferRelease(self0, newSelf);
} else {
removeNode(self0);
safe_free(self0, self0->size());
@@ -1862,7 +1862,7 @@ void freeAndMakeCapacityAtLeast(Node *&self, int capacity,
newSelf->copyChildrenAndKeyFrom(*self3);
getInTree(self, impl) = newSelf;
if (kUseFreeList) {
writeContext->release(self3);
writeContext->deferRelease(self3, newSelf);
} else {
removeNode(self3);
safe_free(self3, self3->size());
@@ -1875,7 +1875,7 @@ void freeAndMakeCapacityAtLeast(Node *&self, int capacity,
newSelf->copyChildrenAndKeyFrom(*self16);
getInTree(self, impl) = newSelf;
if (kUseFreeList) {
writeContext->release(self16);
writeContext->deferRelease(self16, newSelf);
} else {
removeNode(self16);
safe_free(self16, self16->size());
@@ -1888,7 +1888,7 @@ void freeAndMakeCapacityAtLeast(Node *&self, int capacity,
newSelf->copyChildrenAndKeyFrom(*self48);
getInTree(self, impl) = newSelf;
if (kUseFreeList) {
writeContext->release(self48);
writeContext->deferRelease(self48, newSelf);
} else {
removeNode(self48);
safe_free(self48, self48->size());
@@ -1901,7 +1901,7 @@ void freeAndMakeCapacityAtLeast(Node *&self, int capacity,
newSelf->copyChildrenAndKeyFrom(*self256);
getInTree(self, impl) = newSelf;
if (kUseFreeList) {
writeContext->release(self256);
writeContext->deferRelease(self256, newSelf);
} else {
removeNode(self256);
safe_free(self256, self256->size());
@@ -1999,18 +1999,13 @@ void rezero(Node *n, InternalVersionT z) {
#endif
void mergeWithChild(TaggedNodePointer &self, WriteContext *writeContext,
ConflictSet::Impl *impl, Node *&dontInvalidate,
Node3 *self3) {
ConflictSet::Impl *impl, Node3 *self3) {
assert(!self3->entryPresent);
Node *child = self3->children[0];
int minCapacity = self3->partialKeyLen + 1 + child->partialKeyLen;
if (minCapacity > child->getCapacity()) {
const bool update = child == dontInvalidate;
freeAndMakeCapacityAtLeast(child, minCapacity, writeContext, impl, true);
if (update) {
dontInvalidate = child;
}
}
// Merge partial key with child
@@ -2037,7 +2032,7 @@ void mergeWithChild(TaggedNodePointer &self, WriteContext *writeContext,
setMaxVersion(child, std::max(childMaxVersion, writeContext->zero));
self = child;
writeContext->release(self3);
writeContext->deferRelease(self3, self);
}
bool needsDownsize(Node *n) {
@@ -2046,17 +2041,16 @@ bool needsDownsize(Node *n) {
return n->numChildren + n->entryPresent < minTable[n->getType()];
}
void downsize(Node3 *self, WriteContext *writeContext, ConflictSet::Impl *impl,
Node *&dontInvalidate) {
void downsize(Node3 *self, WriteContext *writeContext,
ConflictSet::Impl *impl) {
if (self->numChildren == 0) {
auto *newSelf = writeContext->allocate<Node0>(self->partialKeyLen);
newSelf->copyChildrenAndKeyFrom(*self);
getInTree(self, impl) = newSelf;
writeContext->release(self);
writeContext->deferRelease(self, newSelf);
} else {
assert(self->numChildren == 1 && !self->entryPresent);
mergeWithChild(getInTree(self, impl), writeContext, impl, dontInvalidate,
self);
mergeWithChild(getInTree(self, impl), writeContext, impl, self);
}
}
@@ -2066,7 +2060,7 @@ void downsize(Node16 *self, WriteContext *writeContext,
auto *newSelf = writeContext->allocate<Node3>(self->partialKeyLen);
newSelf->copyChildrenAndKeyFrom(*self);
getInTree(self, impl) = newSelf;
writeContext->release(self);
writeContext->deferRelease(self, newSelf);
}
void downsize(Node48 *self, WriteContext *writeContext,
@@ -2075,7 +2069,7 @@ void downsize(Node48 *self, WriteContext *writeContext,
auto *newSelf = writeContext->allocate<Node16>(self->partialKeyLen);
newSelf->copyChildrenAndKeyFrom(*self);
getInTree(self, impl) = newSelf;
writeContext->release(self);
writeContext->deferRelease(self, newSelf);
}
void downsize(Node256 *self, WriteContext *writeContext,
@@ -2085,17 +2079,16 @@ void downsize(Node256 *self, WriteContext *writeContext,
auto *newSelf = writeContext->allocate<Node48>(self->partialKeyLen);
newSelf->copyChildrenAndKeyFrom(*self256);
getInTree(self, impl) = newSelf;
writeContext->release(self256);
writeContext->deferRelease(self256, newSelf);
}
void downsize(Node *self, WriteContext *writeContext, ConflictSet::Impl *impl,
Node *&dontInvalidate) {
void downsize(Node *self, WriteContext *writeContext, ConflictSet::Impl *impl) {
switch (self->getType()) {
case Type_Node0: // GCOVR_EXCL_LINE
__builtin_unreachable(); // GCOVR_EXCL_LINE
case Type_Node3:
downsize(static_cast<Node3 *>(self), writeContext, impl, dontInvalidate);
downsize(static_cast<Node3 *>(self), writeContext, impl);
break;
case Type_Node16:
downsize(static_cast<Node16 *>(self), writeContext, impl);
@@ -2135,7 +2128,12 @@ Node *erase(Node *self, WriteContext *writeContext, ConflictSet::Impl *impl,
if (self->numChildren != 0) {
if (needsDownsize(self)) {
downsize(self, writeContext, impl, result);
downsize(self, writeContext, impl);
}
if (result != nullptr) {
while (result->releaseDeferred) {
result = result->forwardTo;
}
}
return result;
}
@@ -2158,7 +2156,7 @@ Node *erase(Node *self, WriteContext *writeContext, ConflictSet::Impl *impl,
}
if (needsDownsize(parent3)) {
downsize(parent3, writeContext, impl, result);
downsize(parent3, writeContext, impl);
}
} break;
case Type_Node16: {
@@ -2173,7 +2171,7 @@ Node *erase(Node *self, WriteContext *writeContext, ConflictSet::Impl *impl,
}
if (needsDownsize(parent16)) {
downsize(parent16, writeContext, impl, result);
downsize(parent16, writeContext, impl);
}
} break;
case Type_Node48: {
@@ -2201,7 +2199,7 @@ Node *erase(Node *self, WriteContext *writeContext, ConflictSet::Impl *impl,
parent48->childMaxVersion[lastChildrenIndex] = writeContext->zero;
if (needsDownsize(parent48)) {
downsize(parent48, writeContext, impl, result);
downsize(parent48, writeContext, impl);
}
} break;
case Type_Node256: {
@@ -2212,13 +2210,18 @@ Node *erase(Node *self, WriteContext *writeContext, ConflictSet::Impl *impl,
--parent->numChildren;
if (needsDownsize(parent256)) {
downsize(parent256, writeContext, impl, result);
downsize(parent256, writeContext, impl);
}
} break;
default: // GCOVR_EXCL_LINE
__builtin_unreachable(); // GCOVR_EXCL_LINE
}
if (result != nullptr) {
while (result->releaseDeferred) {
result = result->forwardTo;
}
}
return result;
}
@@ -5102,6 +5105,7 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
n = nextPhysical(n);
}
}
writeContext.releaseDeferred();
gc_iterations_total.add(set_oldest_iterations_accum);
if (n == nullptr) {
removalKey = {};