Dynamically update ECS_RESERVED_MEMORY?

Hi Team,

Currently, the only way to "block out" memory external to ECS-scheduled containers (e.g. consumed by a TMPFS volume, or by a container scheduled directly through "docker run"), seems to be to specify a certain amount in advance via `ECS_RESERVED_MEMORY`. If this amount needs to change dynamically, we have to modify it in `ecs.config`, de-register that instance, and then register it again. That seems like a pretty disruptive change, especially that some tasks may still be running and would not normally be expected to fail or lost track of.

Or is there currently a way (or at least a workaround) to _dynamically_ update the amount of memory not managed by ECS, ideally through an API call, that doesn't disrupt existing tasks on that instance?

Thank you

The issue mentions ECS_RESERVED_MEMORY, ecs.config, instance registration, and Docker containers, but names no source files or tests. Start by reviewing how ECS handles reserved memory and instance registration; done would mean defining a supported dynamic update or non-disruptive workaround, with its effect on running tasks documented.

Written by the indexing model from the issue text.