php-fpm status page - full view - show current worker memory usage

[ITJamie]

Description

It would be great if the full view of the fpm-status page showed current worker memory usage.
it currently only shows how much memory was used in the last request rather than what the worker pid has currently consumed.

[iluuu1994]

Not sure if that would be useful. Note that memory here refers to memory allocated during the request, not total memory used by the process. So you'd essentially be profiling the implementation of the status page. /cc @bukka

[bukka]

Ok I had a look and not sure how we could get this implemented in the current way. This is all based on scoreboard which is not updated during the request so it can just report peak memory of the last request. I understand that this might be quite confusing as other stats are mostly for the current request.

I think we would need to change it to effectively report proc memory (not the internal PHP memory though) as can be found by getrusage for each process at the time of the status request but for that we would need some sort of IPC which I don't think it's practical. Alternatively we could just query /proc/<pid>/status which is more doable. This is not portable of course so for FreeBSD we would need something like procstat.