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=-8.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 004BBC47254 for ; Fri, 1 May 2020 22:25:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C55CE21775 for ; Fri, 1 May 2020 22:25:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588371925; bh=fAFOAbBKXQ/muqSxf3aq391Xmdkj8QsPanvq7XU+Gd8=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:List-ID: From; b=pgkZqnF1S8TZlzTQWttlj0WbhHxmGVfdeoitBeg5cYjlT/kaWsWH3YRnWRE+wNb7U KJGcQ6aZ8jk1gL3mhc+uTV+ubHC6wZYHhj14ngD+q+9+HXBL/pwwcAUZXjOLVjwFdX u5/TBmSO1BDCamLChOQ/zduZe2RbVfUM/h9w1BfQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726352AbgEAWZZ (ORCPT ); Fri, 1 May 2020 18:25:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:60962 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726045AbgEAWZZ (ORCPT ); Fri, 1 May 2020 18:25:25 -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 0ED82216FD; Fri, 1 May 2020 22:25:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588371925; bh=fAFOAbBKXQ/muqSxf3aq391Xmdkj8QsPanvq7XU+Gd8=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=LUJ44MnGrBvXaO0Eo1sLi9gTiVGhgIffNg8lHNyVbaW44jdnTHUSukVmnVxa2T2f/ 7/bCwZGAaABbxu46WG6Yn0RBh4yLHAFEd8Sg8aisEVxYrfF4VwDhgwZ/INWq+T+utU Q7Tmy43+jCg4awi52SWO67rDlWV6WImvyBxy5hBc= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id DA41D3522B72; Fri, 1 May 2020 15:25:24 -0700 (PDT) Date: Fri, 1 May 2020 15:25:24 -0700 From: "Paul E. McKenney" To: "Uladzislau Rezki (Sony)" Cc: LKML , linux-mm@kvack.org, Andrew Morton , "Theodore Y . Ts'o" , Matthew Wilcox , Joel Fernandes , RCU , Oleksiy Avramchenko Subject: Re: [PATCH 10/24] rcu/tree: add rcutree.rcu_min_cached_objs description Message-ID: <20200501222524.GA6283@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20200428205903.61704-1-urezki@gmail.com> <20200428205903.61704-11-urezki@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200428205903.61704-11-urezki@gmail.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: rcu-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org On Tue, Apr 28, 2020 at 10:58:49PM +0200, Uladzislau Rezki (Sony) wrote: > Document the rcutree.rcu_min_cached_objs sysfs kernel parameter. > > Signed-off-by: Uladzislau Rezki (Sony) Could you please combine this wtih the patch that created this sysfs parameter? Thanx, Paul > --- > Documentation/admin-guide/kernel-parameters.txt | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index 828ff975fbc6..b2b7022374af 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -3977,6 +3977,14 @@ > latencies, which will choose a value aligned > with the appropriate hardware boundaries. > > + rcutree.rcu_min_cached_objs= [KNL] > + Minimum number of objects which are cached and > + maintained per one CPU. Object size is equal > + to PAGE_SIZE. The cache allows to reduce the > + pressure to page allocator, also it makes the > + whole algorithm to behave better in low memory > + condition. > + > rcutree.jiffies_till_first_fqs= [KNL] > Set delay from grace-period initialization to > first attempt to force quiescent states. > -- > 2.20.1 >