[perl #131915] [REGRESSION] Proc using more memory since being a Proc::Async

[Aleks-Daniel Jakimenko-Aleksejev via RT]

TL;DR it went from 59820 to 215976 after this commit:
https://github.com/rakudo/rakudo/commit/92bd7e4f54a92fa660f99b4d056d33a08fb98bd2

Bisect log:
https://gist.github.com/678ce88a13272eab454a22568f3bddc7

On 2017-08-16 14:24:48, scoli...@gmail.com wrote:
> Similar to https://rt.perl.org/m/ticket/show?id=131914 it was noticed
> that there is a huge increase of memory usage after running a simple
> echo command.
> Result are in Kbytes.
>
> <AlexDaniel> commit:
> 92bd7e4f54a9^,92bd7e4f54a9,9658dd98c9dd8ec^^,9658dd98c9dd8ec sub mem {
> "/proc/$*PID/statm".IO.lines[0].split(/\s/)[5] * 4096 / 1024 }; say
> mem(); run 'echo'; say mem()
> <committable6test> AlexDaniel, ¦92bd7e4f54a9^: «56444␤␤59820»
> ¦92bd7e4: «56568␤␤215976» ¦9658dd98c9dd8ec^^: «59212␤␤216660»
> ¦9658dd9: «139024␤␤305320»