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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 AF9AFC433DB for ; Fri, 26 Feb 2021 14:43:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7287264E20 for ; Fri, 26 Feb 2021 14:43:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230104AbhBZOmp (ORCPT ); Fri, 26 Feb 2021 09:42:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54414 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230008AbhBZOmn (ORCPT ); Fri, 26 Feb 2021 09:42:43 -0500 Received: from mail-qk1-x729.google.com (mail-qk1-x729.google.com [IPv6:2607:f8b0:4864:20::729]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6112FC06174A for ; Fri, 26 Feb 2021 06:42:03 -0800 (PST) Received: by mail-qk1-x729.google.com with SMTP id d20so8231579qkc.2 for ; Fri, 26 Feb 2021 06:42:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=aiCmYhXNlLmYvqysrua9w657uIfuMXAdivhZFAKEpXA=; b=NpKzeFXzuOhQbPo6fKVGMdf8+6iELovgUdCKZpMjN2+fdRPxMj98bWKMPa5Y7KF4/N vdL3T58tWpe6je0uydaDGpnNIAtNYbCDXb3HxGBOzIghdhU4d87IipH4ECbR6hIuHYL2 OE4vaDcL+OI76JrDT110BgkIXDKANwC6gCSc9nelFg1RXHfxsTBuTo2BHt3HTkq+empV emd0QwJTTpMSsuAj4VMYxzsN04yBeIGuNxeQNqGKbXDSLy2e/LLZE2oB5yAYKcSuV1DG aecXjS/f39eZ6dU0YumxMHbEXGM5IPG7jTLpdrY6p3P4TFb7KAt2gn4o2nh2Yv5IT7vh IYIg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=aiCmYhXNlLmYvqysrua9w657uIfuMXAdivhZFAKEpXA=; b=dv47ErsOT7RupbeVgyO5fzslb09b2zKKntHzvJlUay62B7tRWfq/FgP17qQjD+WvdB Xy1Cg7DcIl2qbHoNIwnnNGx6FijZcAW7IloyC0MnK5x76COqR+q00K33fT1sSen1WqvI lK+xNyd/SCRhNG2mqA6Ez454Yr0wUlwn++iBcKgGauYFVOa68VGjOj51LG1tsU+ckRLp kKSbCYKj8/ZRg80s7oBSv3ySkc3/I4aXi14DDUECcSRP5i9Q4wcEV7DSXBDFXlrAn36y Q5oFZ7kZqKMVbvZPSt0g9+TEiVjfnG3GRpaMqfnZO3AvMNnXB2ie58UEvoa+hYp7nBGO VlPg== X-Gm-Message-State: AOAM532HT6BKGewgTkmvjYvSEC6GoN1FokQsOEtveX3wT730I9eoJtfB Qmn80b76hEkcBAj4M9R5Imaw7Q== X-Google-Smtp-Source: ABdhPJy2NOOfE5ZleC1vNC6+D2fTtJXEm1J15WIn4t802EjUbQ4eaTkrRyQ86tK+Y+nBiiCdVzv/WQ== X-Received: by 2002:a37:7c8:: with SMTP id 191mr2908942qkh.53.1614350522094; Fri, 26 Feb 2021 06:42:02 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-162-115-133.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.162.115.133]) by smtp.gmail.com with ESMTPSA id t71sm6437470qka.86.2021.02.26.06.42.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Feb 2021 06:42:01 -0800 (PST) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1lFeJc-000tBv-SJ; Fri, 26 Feb 2021 10:42:00 -0400 Date: Fri, 26 Feb 2021 10:42:00 -0400 From: Jason Gunthorpe To: Matthew Wilcox Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Freeing page tables through RCU Message-ID: <20210226144200.GV2643399@ziepe.ca> References: <20210225205820.GC2858050@casper.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210225205820.GC2858050@casper.infradead.org> Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org On Thu, Feb 25, 2021 at 08:58:20PM +0000, Matthew Wilcox wrote: > I'd like to hear better ideas than this. You didn't like my suggestion to put a sleepable lock around the freeing of page tables during flushing? I still don't see how you convert the sleepable page walkers to use rcu?? Jason