cmd/pprof: update vendored pprof

[mhansen]

Hi there,

@aalexand and I recently landed a change to github.com/google/pprof to add -tagroot and -tagleaf support for breaking down flamegraph profiles by pprof labels. I imagine this will be particularly useful for Go programs where labels are exposed in the runtime to users.

I'd like to request a pull of the latest github.com/google/pprof into https://github.com/golang/go/tree/master/src/cmd/vendor/github.com/google/pprof, to get this feature into the next Go release, so I can write up my blog post and tell people after the next Go version ships?

I see this was last updated 29 days ago with 9581d89, so perhaps I'm too late. It's OK if I have to wait till the next Go release (if there's a freeze or something), I just thought I'd open this issue in case you're excited about this getting this new profiling feature into the hands of users.

[mhansen]

@dmitshur, maybe you're the person to ask about this, given you just made the last update to the vendored pprof?

[ALTree]

The 1.18 freeze starts November 1st, this pprof change could definitely still go in.

[bcmills]

Yep, just send a CL to update it! (See https://cs.opensource.google/go/go/+/master:src/README.vendor for instructions.)

[mhansen]

Thank you for the pointers and confirmation it's not too late! I'll have a go at this

[gopherbot]

Change https://golang.org/cl/354692 mentions this issue: cmd/pprof: update vendored github.com/google/pprof