linux-kernel - Re: [RFC v2] prctl: prctl(PR_SET_IDLE, PR_IDLE_MODE

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Date:   Wed, 22 Nov 2017 11:29:40 +0100
From:   peter enderborg <peter.enderborg@...y.com>
To:     Shawn Landden <slandden@...il.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-api@...r.kernel.org>
Subject: 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.