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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT 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 2094FC433F5 for ; Mon, 20 Sep 2021 05:21:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 04DB660FF2 for ; Mon, 20 Sep 2021 05:21:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230297AbhITFWJ (ORCPT ); Mon, 20 Sep 2021 01:22:09 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:50558 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229522AbhITFWH (ORCPT ); Mon, 20 Sep 2021 01:22:07 -0400 Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 016C61FFFF; Mon, 20 Sep 2021 05:20:39 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 8D61F13AC7; Mon, 20 Sep 2021 05:20:37 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id J7epEyUaSGFsSwAAMHmgww (envelope-from ); Mon, 20 Sep 2021 05:20:37 +0000 From: Davidlohr Bueso To: tglx@linutronix.de Cc: peterz@infradead.org, mingo@kernel.org, rostedt@goodmis.org, longman@redhat.com, bigeasy@linutronix.de, boqun.feng@gmail.com, dave@stgolabs.net, linux-kernel@vger.kernel.org Subject: [PATCH -tip 0/2] locking/rwbase: Two reader optimizations Date: Sun, 19 Sep 2021 22:20:29 -0700 Message-Id: <20210920052031.54220-1-dave@stgolabs.net> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Patch 1 is a barrier optimization that came up from the reader fastpath ordering auditing. Patch 2 is a resend of the previous broken patch that attempts to use wake_q for read_unlock() slowpath. Tested on v5.15.y-rt. Applies against tip/urgent. Thanks! Davidlohr Bueso (2): locking/rwbase: Optimize rwbase_read_trylock locking/rwbase: Lockless reader waking up a writer kernel/locking/rtmutex.c | 19 +++++++++++++------ kernel/locking/rwbase_rt.c | 11 +++++++---- 2 files changed, 20 insertions(+), 10 deletions(-) -- 2.26.2