Multiple issues in the codebase while building it

[aakar-srivastava]

Hi fellas, recently I was trying to build this repo for auto instrumentation in a Golang application. While doing so, I encountered multiple errors while building it, such as in the allocate.go file, I get this error:
# go.opentelemetry.io/auto/internal/pkg/process internal/pkg/process/allocate.go:43:13: invalid operation: pagesize * nCPU (mismatched types uint64 and int) internal/pkg/process/allocate.go:64:14: cannot use nCPU (variable of type int) as uint64 value in struct literal make: *** [build] Error 1

Also, when I resolve this, then I get something like:
internal/pkg/instrumentation/probe/probe.go:76:26: undefined: perf.Record internal/pkg/instrumentation/probe/probe.go:78:24: undefined: perf.Reader internal/pkg/instrumentation/probe/probe.go:236:23: undefined: perf.NewReader internal/pkg/instrumentation/probe/probe.go:267:27: undefined: perf.ErrClosed internal/pkg/instrumentation/probe/probe.go:321:27: undefined: perf.ErrClosed internal/pkg/instrumentation/probe/probe.go:353:27: undefined: perf.ErrClosed

Am I doing something very wrong, or how is it exactly supposed to work? Please help me out.

[MrAlias]

See #1969

cc @RonFed