From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it1-f199.google.com (mail-it1-f199.google.com [209.85.166.199]) by kanga.kvack.org (Postfix) with ESMTP id D12C38E0001 for ; Mon, 17 Dec 2018 09:58:15 -0500 (EST) Received: by mail-it1-f199.google.com with SMTP id c128so14993841itc.0 for ; Mon, 17 Dec 2018 06:58:15 -0800 (PST) Received: from merlin.infradead.org (merlin.infradead.org. [2001:8b0:10b:1231::1]) by mx.google.com with ESMTPS id r3si3695852ioa.63.2018.12.17.06.58.14 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 17 Dec 2018 06:58:14 -0800 (PST) Date: Mon, 17 Dec 2018 15:57:54 +0100 From: Peter Zijlstra Subject: Re: [PATCH 3/6] psi: eliminate lazy clock mode Message-ID: <20181217145754.GB2218@hirez.programming.kicks-ass.net> References: <20181214171508.7791-1-surenb@google.com> <20181214171508.7791-4-surenb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181214171508.7791-4-surenb@google.com> Sender: owner-linux-mm@kvack.org List-ID: To: Suren Baghdasaryan Cc: gregkh@linuxfoundation.org, tj@kernel.org, lizefan@huawei.com, hannes@cmpxchg.org, axboe@kernel.dk, dennis@kernel.org, dennisszhou@gmail.com, mingo@redhat.com, akpm@linux-foundation.org, corbet@lwn.net, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com On Fri, Dec 14, 2018 at 09:15:05AM -0800, Suren Baghdasaryan wrote: > Eliminate the idle mode and keep the worker doing 2s update intervals > at all times. That sounds like a bad deal.. esp. so for battery powered devices like say Andoird. In general the push has been to always idle everything, see NOHZ and NOHZ_FULL and all the work that's being put into getting rid of any and all period work.