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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 15895FA373E for ; Tue, 25 Oct 2022 20:15:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232743AbiJYUO7 (ORCPT ); Tue, 25 Oct 2022 16:14:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36932 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232725AbiJYUO4 (ORCPT ); Tue, 25 Oct 2022 16:14:56 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 71F2E356CB for ; Tue, 25 Oct 2022 13:14:53 -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=dBpIq/TdGK7Y9QgaqRjiNwMRg2hbzqbzJ+ZsxtPyXYc=; b=gGG7yAkeqEaBVMVkty7OvpYCdH NO6y7z3X4O/jaERksvcYe77kTxJkxYT4Z5uHGjzQp4sjFeT6ifeMdBY5duWXPt9rHazGIki2jfbs5 D9Yqhq3KI9P2QxGFqys7PwT/qNepO21MlnB24rKlJGcPjbdgXZqzhnVE244fGM2UP01Pq1pgUAaCM 9JwH8EhCLqpLSA8lwv+UgNF92nBB6AsB0IpwhFwkOcS3E1in484DwQAGi1w0ZgvU+PK3YItNwLFfB DgoMBiAF3GjnGxDjHEIuDIk5jt2A4qTmP4TVbqeP1IgM57+gMv2R08Kn+UuoYrqXWrYLEWH+sCVy3 DWr7kOAg==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1onQJr-00GWLL-La; Tue, 25 Oct 2022 20:14:39 +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 (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id F1EBE30017F; Tue, 25 Oct 2022 22:14:33 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id D43D3203DC845; Tue, 25 Oct 2022 22:14:33 +0200 (CEST) Date: Tue, 25 Oct 2022 22:14:33 +0200 From: Peter Zijlstra To: Waiman Long Cc: Ingo Molnar , Will Deacon , Boqun Feng , linux-kernel@vger.kernel.org, john.p.donnelly@oracle.com, Hillf Danton , Mukesh Ojha , Ting11 Wang =?utf-8?B?546L5am3?= Subject: Re: [PATCH v3 2/5] locking/rwsem: Limit # of null owner retries for handoff writer Message-ID: References: <20221017211356.333862-1-longman@redhat.com> <20221017211356.333862-3-longman@redhat.com> <980d882c-01b8-2ce1-663f-41a8a337f350@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 25, 2022 at 03:55:09PM -0400, Waiman Long wrote: > That is quite a number of changes spread over many different functions. That > is the kind of changes that may make it harder to backport to stable > releases. Yeah; don't care. it's the right thing to do. It also doesn't need to be reverted since it's a sane and good property for lock-ops to have.