Re: [RFC v2] prctl: prctl(PR_SET_IDLE, PR_IDLE_MODE_KILLME), for stateless idle loops

On 11/03/2017 07:35 AM, Shawn Landden wrote:

It is common for services to be stateless around their main event loop.
If a process sets PR_SET_IDLE to PR_IDLE_MODE_KILLME then it
signals to the kernel that epoll_wait() and friends may not complete,
and the kernel may send SIGKILL if resources get tight.

See my systemd patch: https://github.com/shawnl/systemd/tree/prctl

Android uses this memory model for all programs, and having it in the
kernel will enable integration with the page cache (not in this
series).

16 bytes per process is kinda spendy, but I want to keep
lru behavior, which mem_score_adj does not allow. When a supervisor,
like Android's user input is keeping track this can be done in user-space.
It could be pulled out of task_struct if an cross-indexing additional
red-black tree is added to support pid-based lookup.

What android version is using systemd?
In android there is a OnTrimMemory that is sent from activitymanager that
you can listen on and make a nice exit.

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