From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 25 Sep 2001 01:18:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 25 Sep 2001 01:18:18 -0400 Received: from wiprom2mx2.wipro.com ([203.197.164.42]:4807 "EHLO wiprom2mx2.wipro.com") by vger.kernel.org with ESMTP id ; Tue, 25 Sep 2001 01:18:10 -0400 Message-ID: <3BB013D3.6060408@wipro.com> Date: Tue, 25 Sep 2001 10:49:15 +0530 From: "BALBIR SINGH" User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.4) Gecko/20010913 X-Accept-Language: en-us MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: [RFC] OOM aware applications Content-Type: multipart/mixed; boundary="------------InterScan_NT_MIME_Boundary" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This is a multi-part message in MIME format. --------------InterScan_NT_MIME_Boundary Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I was looking at the code in oom_kill.c, I had the following suggestions Warning: I am not aware of what was discussed earlier about these issues or if they were discusses at all. 1. I was wondering that instead of killing the application using oom_kill_task() directly, should the OOM issue some kind of a warning by sending a signal (some signal with si_code set to a value indicating that the application is causing memory to run out). Then, wait for a while and then see if the application is still misbehaving and if so kill it. 2. Minor changes suggested In the code, I see points *= 2 and points /= 4 in a few places, recommend changing them to points <<= 1 and points >>= 2 to help the compiler generate better code Dialog between the kernel and an OOM aware application on OOM condition kernel to the application: Hey u are running the system out of memory application: Sorry my lord, I commited a blunder and will rectify myself application rectifies itself and everybody lives happily everafter application is stuborn kernel: You must go now, u have been unfair in your demands and have caused a lot of problem application: Does not get to say anything, it is zapped Comments, Suggestions, Criticism Balbir --------------InterScan_NT_MIME_Boundary Content-Type: text/plain; name="Wipro_Disclaimer.txt" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="Wipro_Disclaimer.txt" ---------------------------------------------------------------------------------------------------------------------- Information transmitted by this E-MAIL is proprietary to Wipro and/or its Customers and is intended for use only by the individual or entity to which it is addressed, and may contain information that is privileged, confidential or exempt from disclosure under applicable law. If you are not the intended recipient or it appears that this mail has been forwarded to you without proper authority, you are notified that any use or dissemination of this information in any manner is strictly prohibited. In such cases, please notify us immediately at mailto:mailadmin@wipro.com and delete this mail from your records. ---------------------------------------------------------------------------------------------------------------------- --------------InterScan_NT_MIME_Boundary--