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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 CD9B5C2BB85 for ; Wed, 15 Apr 2020 17:19:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE97B20784 for ; Wed, 15 Apr 2020 17:19:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586971171; bh=1zWOuMcANkwMvPuhTGi4zdHmCsARxtLLlEWSWYI+/9c=; h=Date:From:To:Cc:Subject:Reply-To:List-ID:From; b=NkzWse6UoP/vjnq7r4nqBeZoSWcLeK1wXsDhqi0xhwCwfcd0AdwU2EPJD0ygGuW7T lModcwpRNtYUVBTHpOUp3H/T+zpCTWkl75Bd+saIFYwZUFQWdp18WX6PSWuQTYBuK6 0H8APVnxGR8ydJq5Q/HZtveny0Cy7+xZUsysyijQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404699AbgDORTa (ORCPT ); Wed, 15 Apr 2020 13:19:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:60676 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404505AbgDORT0 (ORCPT ); Wed, 15 Apr 2020 13:19:26 -0400 Received: from paulmck-ThinkPad-P72.home (50-39-105-78.bvtn.or.frontiernet.net [50.39.105.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 329982076D; Wed, 15 Apr 2020 17:19:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586971165; bh=1zWOuMcANkwMvPuhTGi4zdHmCsARxtLLlEWSWYI+/9c=; h=Date:From:To:Cc:Subject:Reply-To:From; b=o1tP4q9g0TSM0PpKe9WdHxSx11Ak0Ua/xag7w3zsdsNt8FMEB0KcIDAu5DEkGKbIT yTyJHZCW0IOgbt6/I/rucsQO1xa9SWq00Tpope8AwQ1B7yBKWPLUm6JGCe14pmxCGe mWv0oDFWLSRUJPGPZKl/MoKMM2x0DvCGEIWNQUTk= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id F2B3B3522AD1; Wed, 15 Apr 2020 10:19:24 -0700 (PDT) Date: Wed, 15 Apr 2020 10:19:24 -0700 From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org Subject: [PATCH tip/core/rcu 0/4] kfree_rcu() updates for v5.8 Message-ID: <20200415171924.GA9270@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This series updates kfree_rcu() testing and OOM handling. It also provides a rcu_gp_might_be_stalled() function that judges whether or not RCU is being stalled. 1. Add ability to increase object allocation size, courtesy of Joel Fernandes. 2. rcu/tree: Add a shrinker to prevent OOM due to kfree_rcu() batching, courtesy of Joel Fernandes. 3. rcu/tree: Count number of batched kfree_rcu() locklessly, courtesy of Joel Fernandes. 4. Add rcu_gp_might_be_stalled() to indicate whether or not there is currently a good chance that the current RCU grace period is being stalled. Thanx, Paul ------------------------------------------------------------------------ include/linux/rcutiny.h | 1 include/linux/rcutree.h | 1 kernel/rcu/rcuperf.c | 5 ++- kernel/rcu/tree.c | 70 +++++++++++++++++++++++++++++++++++++++++++----- kernel/rcu/tree_stall.h | 40 ++++++++++++++++++++++++--- 5 files changed, 106 insertions(+), 11 deletions(-)