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[209.85.220.41]) by mx.google.com with SMTPS id c76sor428775oig.156.2019.03.14.20.45.07 for (Google Transport Security); Thu, 14 Mar 2019 20:45:07 -0700 (PDT) Received-SPF: pass (google.com: domain of sultan.kerneltoast@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; Authentication-Results: mx.google.com; spf=pass (google.com: domain of sultan.kerneltoast@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=sultan.kerneltoast@gmail.com 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) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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