Question

按对象大小，选择不同的分配策略。

// malloc.go

// implementation of new builtin
func newobject(typ *_type) unsafe.Pointer {
    return mallocgc(typ.size, typ, true)
}

// Allocate an object of size bytes.
// Small objects are allocated from the per-P cache's free lists.
// Large objects (> 32 kB) are allocated straight from the heap.

func mallocgc(size uintptr, typ *_type, needzero bool) unsafe.Pointer {
    
    if size == 0 {
        // 零长度对象 ...
    }
    
    if size <= maxSmallSize {
        if noscan && size < maxTinySize {
            ... 微小对象 ...
        } else {
            ... 小对象 ...
        }
    } else {
        ... 大对象 ...
    }
    
    return x
}