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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 02C1BC04EB9 for ; Thu, 6 Dec 2018 10:27:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C351421479 for ; Thu, 6 Dec 2018 10:27:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C351421479 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de 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 S1729462AbeLFK1j (ORCPT ); Thu, 6 Dec 2018 05:27:39 -0500 Received: from mx2.suse.de ([195.135.220.15]:39746 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727575AbeLFK1i (ORCPT ); Thu, 6 Dec 2018 05:27:38 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 1A26BACCC; Thu, 6 Dec 2018 10:27:37 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Thu, 06 Dec 2018 11:27:36 +0100 From: Roman Penyaev To: Davidlohr Bueso Cc: Jason Baron , Alexander Viro , "Paul E. McKenney" , Linus Torvalds , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org Subject: Re: [RFC PATCH 1/1] epoll: use rwlock in order to reduce ep_poll_callback() contention In-Reply-To: <20181206030818.vu5g3edwl67tg3lc@linux-r8p5> References: <20181203110237.14787-1-rpenyaev@suse.de> <45bce871-edfd-c402-acde-2e57e80cc522@akamai.com> <20181206030818.vu5g3edwl67tg3lc@linux-r8p5> Message-ID: <51d9ca4acbbdb17a390383b839f1aba0@suse.de> X-Sender: rpenyaev@suse.de User-Agent: Roundcube Webmail Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2018-12-06 04:08, Davidlohr Bueso wrote: >> On 12/3/18 6:02 AM, Roman Penyaev wrote: > >>> if (!ep_is_linked(epi)) { >>> - list_add_tail(&epi->rdllink, &ep->rdllist); >>> + /* Reverse ->ovflist, events should be in FIFO */ >>> + list_add(&epi->rdllink, &ep->rdllist); >>> ep_pm_stay_awake(epi); >>> } > > This should probably a separate patch as it fixes the ordering, > regardless of the rwlock+xchg optimization. Yes, should not be a part of this RFC. Thanks. -- Roman