entersyscall: How Go Hands the P to the Kernel and Gets It Back
entersyscall marks the G as _Gsyscall but keeps its P, exitsyscall reacquires a P or parks the goroutine, and sysmon’s retake loop yanks the P away roughly 20 microseconds into a …
Go
Escape Analysis in Go: Why Your Local Variable Escaped
Go’s escape analysis models variables as locations in a weighted graph, walks assignment paths looking for anything that outlives its stack frame, and stamps each variable with …
Go Channels Are a Ring Buffer, a Lock and a Wait Queue
A Go channel is a ring buffer, one mutex and two wait queues: sends and receives memmove an element, park the goroutine on a sudog, and hand off with goready.
Go Grows Goroutine Stacks by Copying Them: The 2 KB to 1 GB Journey
Go stacks start at 2 KB, double when the prologue check trips, and are copied to a new address with every pointer in every frame adjusted by the difference between the old and new …
Go Passes Arguments in Registers: The Register ABI and Its Transparent Wrappers
Go’s internal ABI passes arguments in registers, uses fixed registers for the goroutine pointer and a zero value, and generates ABI wrappers so old assembly keeps working.