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 9F488C47256 for ; Fri, 1 May 2020 22:25:27 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 47E0C21835 for ; Fri, 1 May 2020 22:25:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="LUJ44MnG" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 47E0C21835 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C335E8E0005; Fri, 1 May 2020 18:25:26 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BE2EC8E0001; Fri, 1 May 2020 18:25:26 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AD20D8E0005; Fri, 1 May 2020 18:25:26 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0039.hostedemail.com [216.40.44.39]) by kanga.kvack.org (Postfix) with ESMTP id 932E48E0001 for ; Fri, 1 May 2020 18:25:26 -0400 (EDT) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 536C95847 for ; Fri, 1 May 2020 22:25:26 +0000 (UTC) X-FDA: 76769582652.03.kite61_86bd7da93c93b X-HE-Tag: kite61_86bd7da93c93b X-Filterd-Recvd-Size: 3239 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf08.hostedemail.com (Postfix) with ESMTP for ; Fri, 1 May 2020 22:25:25 +0000 (UTC) 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) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 >