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[209.85.220.65]) by mx.google.com with SMTPS id d19sor5820269oti.103.2019.05.07.00.27.26 for (Google Transport Security); Tue, 07 May 2019 00:27:26 -0700 (PDT) Received-SPF: pass (google.com: domain of sultan.kerneltoast@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; spf=pass (google.com: domain of sultan.kerneltoast@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=sultan.kerneltoast@gmail.com X-Google-Smtp-Source: APXvYqyG6hXWXWpi7XEBI/DlyfoNWcZlsC+PlPheQwnNUwyImO+kZSLDKaxa2x4xmrLvZ3a+smTnDA== X-Received: by 2002:a9d:6c5a:: with SMTP id g26mr10914341otq.187.1557214046204; Tue, 07 May 2019 00:27:26 -0700 (PDT) Received: from sultan-box.localdomain ([107.193.118.89]) by smtp.gmail.com with ESMTPSA id s26sm4968147otk.24.2019.05.07.00.27.23 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 07 May 2019 00:27:25 -0700 (PDT) Date: Tue, 7 May 2019 00:27:21 -0700 From: Sultan Alsawaf To: Greg Kroah-Hartman Cc: "open list:ANDROID DRIVERS" , Daniel Colascione , kernel-team , Todd Kjos , Kees Cook , Peter Zijlstra , LKML , Tim Murray , Michal Hocko , linux-mm , Arve =?iso-8859-1?B?SGr4bm5lduVn?= , Ingo Molnar , Martijn Coenen , Steven Rostedt , Oleg Nesterov , Joel Fernandes , Andy Lutomirski , Suren Baghdasaryan , Christian Brauner Subject: Re: [RFC] simple_lmk: Introduce Simple Low Memory Killer for Android Message-ID: <20190507072721.GA4364@sultan-box.localdomain> References: <20190317114238.ab6tvvovpkpozld5@brauner.io> <20190318002949.mqknisgt7cmjmt7n@brauner.io> <20190318235052.GA65315@google.com> <20190319221415.baov7x6zoz7hvsno@brauner.io> <20190319231020.tdcttojlbmx57gke@brauner.io> <20190320015249.GC129907@google.com> <20190507021622.GA27300@sultan-box.localdomain> <20190507070430.GA24150@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190507070430.GA24150@kroah.com> 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 Tue, May 07, 2019 at 09:04:30AM +0200, Greg Kroah-Hartman wrote: > Um, why can't "all" Android devices take the same patches that the Pixel > phones are using today? They should all be in the public android-common > kernel repositories that all Android devices should be syncing with on a > weekly/monthly basis anyway, right? > > thanks, > > greg k-h Hi Greg, I only see PSI present in the android-common kernels for 4.9 and above. The vast majority of Android devices do not run a 4.9+ kernel. It seems unreasonable to expect OEMs to toil with backporting PSI themselves to get decent memory management. But even if they did backport PSI, it wouldn't help too much because a PSI-enabled LMKD solution is not ready yet. It looks like a PSI-based LMKD is still under heavy development and won't be ready for all Android devices for quite some time. Additionally, it looks like the supposedly-dead lowmemorykiller.c is still being actively tweaked by Google [1], which does not instill confidence that a definitive LMK solution a la PSI is coming any time soon. Thanks, Sultan [1] https://android.googlesource.com/kernel/common/+/152bacdd85c46f0c76b00c4acc253e414513634c