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[23.128.96.18]) by mx.google.com with ESMTP id 74si1580042lfh.162.2020.05.08.07.15.33; Fri, 08 May 2020 07:16:02 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=merlin.20170209 header.b=fBiQd9Iz; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727960AbgEHOKY (ORCPT + 99 others); Fri, 8 May 2020 10:10:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44908 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726792AbgEHOKX (ORCPT ); Fri, 8 May 2020 10:10:23 -0400 Received: from merlin.infradead.org (unknown [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 81BD8C05BD43; Fri, 8 May 2020 07:10:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=0S9YlEMp9Fll1gT9k7DjCjsWQkPxcTbl7fnb3cKQ7G4=; b=fBiQd9Iz1busnHlOGBKJ5hWfHK VcHIwfHaTUDN8GUwzo86b71ehk4KpZzkjb4rK+QFmyAc2eVLTeKpJL6ygT4xq/the3Ue2hL4CLhch CR4i7CXFLkj20SB4bc8yqzgddId1ZbU8dVEoznPe96yFCNi0acypBXqbeF4ceXz4e72fXzwxCWxvL BixOPAZb50ASIYtxi/EoQ7gTMzIKYPe/cvob6kwUYwyF9L3anypR6ASURchw0+OEZL8ewvZN69TN/ LCfyP21Y/Lj/ph0jTnnhURUZ7/opiQQu5XBoPhbrFKcxY+Tqa6C+avK3qRpxwmYgSbzn/ibn0PKBO xME49MLA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jX3h8-0005Ij-AE; Fri, 08 May 2020 14:09:42 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 2712E3079EB; Fri, 8 May 2020 16:09:39 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 0A42C28688AB1; Fri, 8 May 2020 16:09:39 +0200 (CEST) Date: Fri, 8 May 2020 16:09:38 +0200 From: Peter Zijlstra To: Quentin Perret Cc: Greg KH , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, sudeep.holla@arm.com, rafael@kernel.org, viresh.kumar@linaro.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, mcgrof@kernel.org, keescook@chromium.org, yzaikin@google.com, fweisbec@gmail.com, tkjos@google.com, kernel-team@android.com Subject: Re: [PATCH 00/14] Modularize schedutil Message-ID: <20200508140938.GA3344@hirez.programming.kicks-ass.net> References: <20200507181012.29791-1-qperret@google.com> <20200508081128.GM5298@hirez.programming.kicks-ass.net> <20200508103721.GA3860390@kroah.com> <20200508111612.GA252673@google.com> <20200508113141.GB5298@hirez.programming.kicks-ass.net> <20200508130507.GA10541@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200508130507.GA10541@google.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 08, 2020 at 02:05:07PM +0100, Quentin Perret wrote: > So, all in all, I don't think the series actively makes schedutil worse > by adding out-of-line calls in the hot path or anything like that, and Do note that (afaik) ARM64 (and Power and probably others) has modules in an address space that is not reachable from regular kernel text and needs those intermediate trampolines. While that's probably not a very big deal, it does increase L1$ pressure and things.