Hands-On High Performance with Go

Memory allocation primer

Let's quickly discuss a couple of objects that are associated with Go's small object memory allocation.

We can see the mheap and mspan structs in https://golang.org/src/runtime/mheap.go.

mheap is the main malloc heap. It keeps track of global data, as well as many other heap details. Some important ones are as follows:

Name	Description
lock	A mutex locking mechanism
free	An mTreap (a data structure that is a blend of a tree and a heap) of non-scavenged spans
scav	An mTreap of free and scavenged spans
sweepgen	An integer that keeps track of a span's swept status
sweepdone	Tracking whether all spans are swept
sweepers	The number of sweepone calls active

mspan is the main ...