Per-process instrumentation

[Peter Geoghegan]

Hi,

I'm currently using powertop to reduce the power consumption when idle
of PostgreSQL, which is very important in virtualised environments.

As great as powertop is at measuring my progress, I'd really like to
see its instrumentation per-process. Currently, I can only see it per
process group. PostgreSQL has a multi-process architecture, so it
would be great if I knew which processes (each of which represents
different subsystems or database connections) to target first.

Thanks