From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-f72.google.com (mail-lf0-f72.google.com [209.85.215.72]) by kanga.kvack.org (Postfix) with ESMTP id D0AEE6B0253 for ; Wed, 22 Nov 2017 05:29:42 -0500 (EST) Received: by mail-lf0-f72.google.com with SMTP id 27so1300764lft.20 for ; Wed, 22 Nov 2017 02:29:42 -0800 (PST) Received: from SELDSEGREL01.sonyericsson.com (seldsegrel01.sonyericsson.com. [37.139.156.29]) by mx.google.com with ESMTPS id b78si2573920lfb.153.2017.11.22.02.29.41 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 22 Nov 2017 02:29:41 -0800 (PST) Subject: Re: [RFC v2] prctl: prctl(PR_SET_IDLE, PR_IDLE_MODE_KILLME), for stateless idle loops References: <20171101053244.5218-1-slandden@gmail.com> <20171103063544.13383-1-slandden@gmail.com> From: peter enderborg Message-ID: Date: Wed, 22 Nov 2017 11:29:40 +0100 MIME-Version: 1.0 In-Reply-To: <20171103063544.13383-1-slandden@gmail.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Language: en-GB Sender: owner-linux-mm@kvack.org List-ID: To: Shawn Landden Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org