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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 2B78FC4338F for ; Thu, 5 Aug 2021 15:28:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0BDFA60EE8 for ; Thu, 5 Aug 2021 15:28:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234549AbhHEP3M (ORCPT ); Thu, 5 Aug 2021 11:29:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230521AbhHEP3K (ORCPT ); Thu, 5 Aug 2021 11:29:10 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6E267C061765 for ; Thu, 5 Aug 2021 08:28:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=g6MySzxsjNJgC04riXxageoIBkjcOdfx8jG32o2Cq2k=; b=vazkebJFR09P5s20SCHAglwJr/ 7n2HPTO9ND6M8AQY4V4ctMSR4e6NnqUmUH/zDbcR1R2NL2CQB3Fsl6BTZRMcu4nZ/mmh/qYzAYhYd QenPzyrFI21oIgBmWHVqjvBhsxr8GXThY4MdmRexRchBU7wkK2f9K3zQck+SS/AJk1UH2Zgkw9Sn4 hdIru8n8IgLdrMyQHJR4Nh0nQuu68XizBFJmPRq5m8d6C7VTKLSNnhVZbZv4jWV1v6++XMh3RUNsQ 5lMGRS9hhRmC8IB3cJ1iD/kSfgQ1AJ0wxnJyDgWOsnY72QyOP2ea3RhoRJCaGhTYzYaQ/mFWXC1bl bLOjDRZw==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mBfI1-007Dta-NZ; Thu, 05 Aug 2021 15:28:15 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 6EAEC300084; Thu, 5 Aug 2021 17:28:08 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 29C9324C18599; Thu, 5 Aug 2021 17:28:08 +0200 (CEST) Date: Thu, 5 Aug 2021 17:28:08 +0200 From: Peter Zijlstra To: Steven Rostedt Cc: Rahul Gopakumar , Valentin Schneider , Abdul Anshad Azeez , "linux-kernel@vger.kernel.org" , "mingo@redhat.com" , "juri.lelli@redhat.com" , "vincent.guittot@linaro.org" , Rajender M , Linus Torvalds Subject: Re: [Linux Kernel 5.13 GA] ESXi Performance regression Message-ID: References: <87a6m4kk4f.mognet@arm.com> <20210805105853.66425074@oasis.local.home> <20210805112437.17604e2d@oasis.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210805112437.17604e2d@oasis.local.home> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Aug 05, 2021 at 11:24:37AM -0400, Steven Rostedt wrote: > On Thu, 5 Aug 2021 17:05:00 +0200 > Peter Zijlstra wrote: > > > > Hmm, is this a user space breakage? > > > > All those files were under CONFIG_SCHED_DEBUG and a !DEBUG build would > > not have them to begin with. > > But you can have a config with CONFIG_DEBUG_FS disabled, and DEBUG and > SCHED_DEBUG enabled, which means that there's now configs where this > value is no longer available. You already had that, notably: CONFIG_SCHED_DEBUG=n. These have always been debug knobs, if you touch them you get to keep the pieces.