From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 87090C10F06 for ; Fri, 15 Mar 2019 03:45:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6045F206BA for ; Fri, 15 Mar 2019 03:45:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727600AbfCODpI (ORCPT ); Thu, 14 Mar 2019 23:45:08 -0400 Received: from mail-oi1-f172.google.com ([209.85.167.172]:41111 "EHLO mail-oi1-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726910AbfCODpI (ORCPT ); Thu, 14 Mar 2019 23:45:08 -0400 Received: by mail-oi1-f172.google.com with SMTP id k8so6223830oik.8 for ; Thu, 14 Mar 2019 20:45:07 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=jqNqOSWwhyyf+mDbXl2RsLz9qA1Z9EB5hcTdEP6DIm8=; b=F+A7tMjgqgwOlbrcjvaKvS2ffg5fZxUn0QOb5X53ob2p+fyQkAPoEhbE6LQXcLHm9o +Owy/8OqUCEBSqP0bNil+qAK5CggwmzdGqpYbmhHd80A73BaHsRURCdK6fEsv6C4Cn5a SWW6szpXpIkSoGUM9vNlwzxbhFxANi9aQ9wz2Qwwv78lINR88n9vfn7pDhhANgQFCEVj MsCUOML5X9dmIM68Kt9AFKVeuVtgiM14gZV3pnux8G/omWcrXPcFvwLizM6ZHe/H2uTM LtugnM7miSt9k4FTAviwnQzo6dvfCdFXDqxY3noSXMx+p0F3sftwpaKjZOPuT45TqwAe GxFQ== X-Gm-Message-State: APjAAAXg9wYcPfrXXqIXfe5xC2I/F1+TLDt+NtoDY93EY67ZLsEB2Phs GD1wA+3IJeKZb0u0QOv6EZg= X-Google-Smtp-Source: APXvYqynQjzPuOsgLwmkCGsLMO/giFuMCJcqVPUnKs8zN8zfF6EmPqXnpAVPXz3B2yxsCH/0b2BTBw== X-Received: by 2002:aca:47d4:: with SMTP id u203mr295513oia.175.1552621507233; Thu, 14 Mar 2019 20:45:07 -0700 (PDT) Received: from sultan-box.localdomain ([107.193.118.89]) by smtp.gmail.com with ESMTPSA id b2sm587690oih.1.2019.03.14.20.45.05 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 14 Mar 2019 20:45:06 -0700 (PDT) Date: Thu, 14 Mar 2019 20:45:02 -0700 From: Sultan Alsawaf To: Steven Rostedt Cc: Joel Fernandes , Tim Murray , Michal Hocko , Suren Baghdasaryan , Greg Kroah-Hartman , Arve =?iso-8859-1?B?SGr4bm5lduVn?= , Todd Kjos , Martijn Coenen , Christian Brauner , Ingo Molnar , Peter Zijlstra , LKML , "open list:ANDROID DRIVERS" , linux-mm , kernel-team Subject: Re: [RFC] simple_lmk: Introduce Simple Low Memory Killer for Android Message-ID: <20190315034502.GB3171@sultan-box.localdomain> References: <20190311175800.GA5522@sultan-box.localdomain> <20190311204626.GA3119@sultan-box.localdomain> <20190312080532.GE5721@dhcp22.suse.cz> <20190312163741.GA2762@sultan-box.localdomain> <20190314204911.GA875@sultan-box.localdomain> <20190314231641.5a37932b@oasis.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190314231641.5a37932b@oasis.local.home> User-Agent: Mutt/1.11.4 (2019-03-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 14, 2019 at 11:16:41PM -0400, Steven Rostedt wrote: > How would you implement such a method in userspace? kill() doesn't take > any parameters but the pid of the process you want to send a signal to, > and the signal to send. This would require a new system call, and be > quite a bit of work. If you can solve this with an ebpf program, I > strongly suggest you do that instead. This can be done by introducing a new signal number that provides SIGKILL functionality while blocking (maybe SIGKILLBLOCK?). Thanks, Sultan