inline void* MemoryManager::smartMalloc(size_t nbytes) {
nbytes += sizeof(SmallNode);
if (UNLIKELY(nbytes > kMaxSmartSize)) {
return smartMallocBig(nbytes);
}
nbytes = smartSizeClass(nbytes);
m_stats.usage += nbytes;
auto const idx = (nbytes - 1) >> kLgSizeQuantum;
assert(idx < kNumSizes && idx >= 0);
void* vp = m_sizeTrackedFree[idx].maybePop();
if (UNLIKELY(vp == nullptr)) {
return smartMallocSlab(nbytes);
}
FTRACE(1, "smartMalloc: {} -> {}\n", nbytes, vp);
return vp;
}
inline void* MemoryManager::smartMalloc(size_t nbytes) {
ASSERT(nbytes > 0);
// add room for header before rounding up
size_t padbytes = (nbytes + sizeof(SmallNode) + kMask) & ~kMask;
if (LIKELY(padbytes <= kMaxSmartSize)) {
m_stats.usage += padbytes;
unsigned i = (padbytes - 1) >> kLgSizeQuantum;
ASSERT(i < kNumSizes);
void* p = m_smartfree[i].maybePop();
if (LIKELY(p != 0)) return p;
char* mem = m_front;
if (LIKELY(mem + padbytes <= m_limit)) {
m_front = mem + padbytes;
SmallNode* n = (SmallNode*) mem;
n->padbytes = padbytes;
return n + 1;
}
return smartMallocSlab(padbytes);
}
