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=-2.3 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 872AAC10F13 for ; Tue, 16 Apr 2019 13:11:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4BA8A20675 for ; Tue, 16 Apr 2019 13:11:11 +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="k44v1PNZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729233AbfDPNLK (ORCPT ); Tue, 16 Apr 2019 09:11:10 -0400 Received: from merlin.infradead.org ([205.233.59.134]:45464 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727841AbfDPNLJ (ORCPT ); Tue, 16 Apr 2019 09:11:09 -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=Bv3JqS1h0FfkOhLZWJeILwPGrFooc02SKas4ytoJty4=; b=k44v1PNZTEplQhsJMbRsF+2uH HkH49yFNsW0eXYekJzQMIk4yYNewlajCjCycTQRF3bsmeUA2RSUYPxw/v7lMMvsNsgP3WswNLxba2 Pq+OxiQBKfs5t3tj4eKbv0DaNx2Q1TvP0IXVkttSI/asTfN6S5oiFiBsuDDDQalPrvvMLmmyg+q2m lL4oJZsNmPEOqwS6s9bAIwsKWT5yNSJbegrfDrVy9qNvBNYEJC+jovCNmjNUVjUeKq27f7Ct8dQoD p5GuLwVPa/ZWc/vtpq18spp329ZrGp15LxZGcrpHBeBX7i28B5RK9WQCa6x51ryU5DimUIEiQZwiM 4jjH2DsGg==; 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 1hGNrO-0002bs-DD; Tue, 16 Apr 2019 13:10:50 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 4D6D629B5EFAF; Tue, 16 Apr 2019 15:10:47 +0200 (CEST) Date: Tue, 16 Apr 2019 15:10:47 +0200 From: Peter Zijlstra To: Waiman Long Cc: Ingo Molnar , Will Deacon , Thomas Gleixner , linux-kernel@vger.kernel.org, x86@kernel.org, Davidlohr Bueso , Linus Torvalds , Tim Chen , huang ying Subject: Re: [PATCH-tip 0/2] locking/rwsem: Rwsem rearchitecture part 2 follow-up patches Message-ID: <20190416131047.GW11158@hirez.programming.kicks-ass.net> References: <20190415205829.32707-1-longman@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190415205829.32707-1-longman@redhat.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 Mon, Apr 15, 2019 at 04:58:27PM -0400, Waiman Long wrote: > This series contain 2 follow-up patches to alleviate the performance > regression found in the page_fault1 test of the will-it-scale benchmark. > This does not recover all the lost performance, but reclaim a sizeable > portion of it. > > The regression was found on an Intel system. I have run the test on > an AMD system. The regression wasn't seen there. There are only minor > variations in performance. Perhaps the page fault path is quite different > between Intel and AMD systems. Can you please just fold this back into the appropriate patches? Trying to review all the back and forth is painful.