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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=no 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 62ECFC54FCE for ; Mon, 23 Mar 2020 13:30:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2E98820735 for ; Mon, 23 Mar 2020 13:30:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728524AbgCWNaa (ORCPT ); Mon, 23 Mar 2020 09:30:30 -0400 Received: from foss.arm.com ([217.140.110.172]:49058 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728355AbgCWNa3 (ORCPT ); Mon, 23 Mar 2020 09:30:29 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 12D151FB; Mon, 23 Mar 2020 06:30:29 -0700 (PDT) Received: from e113632-lin (e113632-lin.cambridge.arm.com [10.1.194.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2D9823F52E; Mon, 23 Mar 2020 06:30:28 -0700 (PDT) References: <20200320151245.21152-1-mgorman@techsingularity.net> <20200320151245.21152-3-mgorman@techsingularity.net> User-agent: mu4e 0.9.17; emacs 26.3 From: Valentin Schneider To: Mel Gorman Cc: Ingo Molnar , Peter Zijlstra , Vincent Guittot , Phil Auld , LKML Subject: Re: [PATCH 2/4] sched/fair: Track efficiency of task recent_used_cpu In-reply-to: <20200320151245.21152-3-mgorman@techsingularity.net> Date: Mon, 23 Mar 2020 13:30:25 +0000 Message-ID: MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 20 2020, Mel Gorman wrote: > SIS Recent Used Hit: A recent CPU was eligible and used. Each hit is > a domain search avoided. > > SIS Recent Used Miss: A recent CPU was eligible but unavailable. Each > time this is hit, there was a penalty to the fast path before > a domain search happened. > > SIS Recent Success Rate: A percentage of the number of hits versus > the total attempts to use the recent CPU. > > SIS Recent Attempts: The total number of times the recent CPU was examined. > A high number of Recent Attempts with a low Success Rate implies > the fast path is being punished severely. This could have been > presented as a weighting of hits and misses but calculating an > appropriate weight for misses is problematic. > Ditto on the raw vs post-processed detail in the changelog, otherwise: Reviewed-by: Valentin Schneider > Signed-off-by: Mel Gorman