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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham 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 4FD38C64EB8 for ; Tue, 9 Oct 2018 15:44:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E720420644 for ; Tue, 9 Oct 2018 15:44:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="L7/ZuEab" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E720420644 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726786AbeJIXBp (ORCPT ); Tue, 9 Oct 2018 19:01:45 -0400 Received: from merlin.infradead.org ([205.233.59.134]:50486 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726468AbeJIXBp (ORCPT ); Tue, 9 Oct 2018 19:01:45 -0400 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:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=++vuG6TpA+w9/zjx5UQwe+jRBnit/ly0KoVTl6QyMG4=; b=L7/ZuEabywGZfjtrWu61Jucz/ EYGM4UFepMcfaZKorypVBKxm2+QhNZzQ0VBYUJdFHEfNSq08Ki7Od+TygeUXgW1Lk3+aMzx3RhMuJ M0kfqEcDWFnTK5NWm49jpdpQkq8mNZjxVa1mq2M5i/9VFBbnevzAr4W+tT6ONY2TLBfZoZi8aKhFi DeE6X0IexFm2ARpw3JQ+r9rOXXcfcb9O0tdzFKyv2stnDL9YEgpOYaFRvwAwqyg1HThPA1MXBlqbl 8Aj3ckHoLWTBsFrvO+cInC2pRjulHn4tlHxyotWVshQy9Is+knrkKRLR36mHrKNm9twLCq2pX0AiX C2X831y5w==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1g9uB4-000683-F8; Tue, 09 Oct 2018 15:44:07 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id B175220274BAE; Tue, 9 Oct 2018 17:43:59 +0200 (CEST) Date: Tue, 9 Oct 2018 17:43:59 +0200 From: Peter Zijlstra To: Lukasz Luba Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, b.zolnierkie@samsung.com, mingo@redhat.com, will.deacon@arm.com, corbet@lwn.net Subject: Re: [PATCH] Doc: lockdep: add information about performance impact Message-ID: <20181009154359.GB5728@hirez.programming.kicks-ass.net> References: <20181009153935eucas1p2dec146575ed5fefd4a0b2b6cb9bac056~b_ujkjRd31303013030eucas1p2C@eucas1p2.samsung.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181009153935eucas1p2dec146575ed5fefd4a0b2b6cb9bac056~b_ujkjRd31303013030eucas1p2C@eucas1p2.samsung.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 09, 2018 at 05:39:27PM +0200, Lukasz Luba wrote: > This patch add some warning related to performance drop. > It should be mentioned that this is not for free > and the platfrom resources (cache, bus interconnect, etc.) > will be used more frequently. To me this reads a bit like: water is wet. Is this really needed?