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 907F9C433E0 for ; Thu, 18 Jun 2020 19:04:03 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 54B53207DD for ; Thu, 18 Jun 2020 19:04:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="P4Z9iGwP" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 54B53207DD 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 A35EF6B009D; Thu, 18 Jun 2020 15:04:02 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 9E6326B009E; Thu, 18 Jun 2020 15:04:02 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8F9F86B009F; Thu, 18 Jun 2020 15:04:02 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0228.hostedemail.com [216.40.44.228]) by kanga.kvack.org (Postfix) with ESMTP id 769BD6B009D for ; Thu, 18 Jun 2020 15:04:02 -0400 (EDT) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 2B11E234390 for ; Thu, 18 Jun 2020 19:04:02 +0000 (UTC) X-FDA: 76943257524.17.drink70_561261826e12 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin17.hostedemail.com (Postfix) with ESMTP id 8900A180D0184 for ; Thu, 18 Jun 2020 19:04:00 +0000 (UTC) X-HE-Tag: drink70_561261826e12 X-Filterd-Recvd-Size: 3934 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf01.hostedemail.com (Postfix) with ESMTP for ; Thu, 18 Jun 2020 19:04:00 +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 2F0B7207DD; Thu, 18 Jun 2020 19:03:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592507039; bh=FcKGLNRNqI63/khvEfTqTTG7E7jDUOi4glDel5vUcmk=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=P4Z9iGwPuioH4OpAG4O0cRH6EmTmmFsbompSyHYUNcVMFj4kIXBJZ4NxzU5HDUTbA tz+yfLch74E8uSVbm5UjQqxFX5apaeZzAQs6RVZ5M1PYrWVZPhCfKQ5XalneP6oJ13 yDxiCjOkY7eQ3gnqN5itSjKTn3IAbkzRhbCJEMrU= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 149FD35229B4; Thu, 18 Jun 2020 12:03:59 -0700 (PDT) Date: Thu, 18 Jun 2020 12:03:59 -0700 From: "Paul E. McKenney" To: Uladzislau Rezki Cc: Matthew Wilcox , LKML , linux-mm@kvack.org, Andrew Morton , "Theodore Y . Ts'o" , Joel Fernandes , RCU , Oleksiy Avramchenko Subject: Re: [PATCH v2 09/16] rcu/tree: Maintain separate array for vmalloc ptrs Message-ID: <20200618190359.GU2723@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20200525214800.93072-1-urezki@gmail.com> <20200525214800.93072-10-urezki@gmail.com> <20200617234609.GA10087@paulmck-ThinkPad-P72> <20200618005214.GN8681@bombadil.infradead.org> <20200618031823.GQ2723@paulmck-ThinkPad-P72> <20200618173520.GC14613@pc636> <20200618175719.GT2723@paulmck-ThinkPad-P72> <20200618183448.GA15136@pc636> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200618183448.GA15136@pc636> User-Agent: Mutt/1.9.4 (2018-02-28) X-Rspamd-Queue-Id: 8900A180D0184 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 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 Thu, Jun 18, 2020 at 08:34:48PM +0200, Uladzislau Rezki wrote: > > > > > > > > I suspect that he would like to keep the tracing. > > > > > > > > It might be worth trying the branches, given that they would be constant > > > > and indexed by "i". The compiler might well remove the indirection. > > > > > > > > The compiler guys brag about doing so, which of course might or might > > > > not have any correlation to a given compiler actually doing so. :-/ > > > > > > > > Having a vfree_bulk() might well be useful, but I would feel more > > > > confidence in that if there were other callers of kfree_bulk(). > > > > > > > Hmm... I think replacing that with vfree_bulk() is a good idea though. > > > > In other words, get rid of kfree_bulk() in favor of vfree_bulk()? > > > kfree_bulk() does not understand vmalloc memory. vfree_bulk() should > be implemented to release vmalloc's pointers. On i high level it will > be used the same way as kfree_bulk() but for vmalloc ptrs. only. Ah, I thought that you guys were proposing something that did bulk free of both kmalloc and vmalloc memory. Thanx, Paul > > > > But again, either way, future work as far as this series is concerned. > > > > > > > What do you mean: is concerned? > > > > Apologies for the strange English. How about this? > > > > "This series is OK as is. Any comments above did not prevent me from > > taking these patches, but instead discuss possible future work." > > > That is perfectly clear to me :) > > > > We are planning to implement kfree_rcu() to be integrated directly into > > > SLAB: SLAB, SLUB, SLOB. So, there are plenty of future work :) > > > > And I am glad that this is still the goal. ;-) > > > :) > > -- > Vlad Rezki