go build -gcflags '-N -l' example.go && ./example
If I use this to compile example.go it shound disable function inline and
the compile code should call ref() in example.go and will call mallocgc
runtimestats.Mallocs can see it but it is not.
在 2017年4月14日星期五 UTC+8下午10:01:25，Ian Lance Taylor写道：
>
> On Thu, Apr 13, 2017 at 10:45 PM, 刘桂祥 <liuguix...@gmail.com <javascript:>>
> wrote:
> > go1.7.1
> >
> > go run -gcflags '-N -l -m' example.go
>
> It is the -m flag that is generating the output you see.
>
> If there is some other bug, please let us know what it is.
>
> Ian
>
> > 在 2017年4月14日星期五 UTC+8下午1:18:26，Ian Lance Taylor写道：
> >>
> >> On Thu, Apr 13, 2017 at 8:33 PM, 刘桂祥 <liuguix...@gmail.com> wrote:
> >> > // example.go
> >> > package main
> >> >
> >> >
> >> > import "runtime"
> >> >
> >> >
> >> > type S struct{}
> >> >
> >> >
> >> > func main() {
> >> > var stats runtime.MemStats
> >> >
> >> >
> >> > runtime.ReadMemStats(&stats)
> >> > println(stats.Mallocs)
> >> > var x S
> >> > runtime.ReadMemStats(&stats)
> >> > println(stats.Mallocs)
> >> > _ = *ref(x)
> >> > runtime.ReadMemStats(&stats)
> >> > println(stats.Mallocs)
> >> > }
> >> >
> >> >
> >> > func ref(z S) *S {
> >> > return &z
> >> > }
> >> >
> >> > go build -gcflags '-N -l' example.go && ./example
> >> > or
> >> > go run -gcflags '-N -l' example.go
> >> >
> >> > results:
> >> > ./example.go:21: &z escapes to heap
> >> > ./example.go:20: moved to heap: z
> >> > ./example.go:10: main &stats does not escape
> >> > ./example.go:13: main &stats does not escape
> >> > ./example.go:16: main &stats does not escape
> >> > 61
> >> > 61
> >> > 61
> >>
> >> That looks like the output from -gcflags="-m -l". Are you really sure
> >> you typed -N? What version of Go are you using?
> >>
> >> Ian
> >
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