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 4661AC433C1 for ; Thu, 25 Mar 2021 14:34:37 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DAC8961A0A for ; Thu, 25 Mar 2021 14:34:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DAC8961A0A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 5135E6B006C; Thu, 25 Mar 2021 10:34:36 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4EA016B0072; Thu, 25 Mar 2021 10:34:36 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 38ACB6B007B; Thu, 25 Mar 2021 10:34:36 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0027.hostedemail.com [216.40.44.27]) by kanga.kvack.org (Postfix) with ESMTP id 1C29C6B006C for ; Thu, 25 Mar 2021 10:34:36 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id CAB8F88A6DCA for ; Thu, 25 Mar 2021 14:34:35 +0000 (UTC) X-FDA: 77958642510.20.A6E57BF Received: from mail-qt1-f174.google.com (mail-qt1-f174.google.com [209.85.160.174]) by imf28.hostedemail.com (Postfix) with ESMTP id 33AD52000260 for ; Thu, 25 Mar 2021 14:34:26 +0000 (UTC) Received: by mail-qt1-f174.google.com with SMTP id g24so1768420qts.6 for ; Thu, 25 Mar 2021 07:34:26 -0700 (PDT) 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=EBYoeSyDCelHfJ08uskYOli02Uf/rlFwmOTlzuC7hgI=; b=N+fdDxgVQQYMaT/p6QFW+V+ir33fgy01dD+fxi2S7KZNbrlN0AKe9IlL/J1vJWeJnz hDQZQOIunjFFjO8/Jo+aGOaXBeoSrUgkbdCqiGfXW7noLO5+gnskrV0qxQbbRE40LJkk ziNgqfdxF7bKl35iD7YXDKSgmva/aIGNM+q1myQy5V9FMBTxaL17ESoplXA7WfzuR5pU TnaNXA2Ff4Gn7s8apv0fssxRfjCBVhYRqE21LX+Ef/XjQlA11SY/LFfjgVU+1vZ/eHZ9 /fgdB/rMEifTJ16pYmqArjc3KG7IFBW7u6A7EEZEn8cGeucy5yC0ULc0S1+papQW7uC0 yGUg== 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=EBYoeSyDCelHfJ08uskYOli02Uf/rlFwmOTlzuC7hgI=; b=CRPiMhMN4/vLt6DD4vZFA6PsBVWsROAtubvMQOCk2xGES5YFDkOiloW8Ibj+JuDIZP C8NI7qA/ghbr5V0CCihySW2Q7W7eBDvibzO20+kebYdKWCsKMNT+VnW1qeyJqNvXmUkH 6m1x3R6h1FOzWoV79ysraIUAKQCPJJ2fDD4r8vU5pyQ/pmqxOA3SurGY02KWbyM0chjE UAy7mThlcm7QRq/kPruX0j6tPTnetZaQ0G/7Z1n/nPtCk8LpZIm1HJLR4UF2xSg3CWeI qnERMOEjebuKpw3ozH+A2JMHBnL9ozy8mmEVdcf1xscir6wc5RdvkPneA207yF4xPxGs qFXg== X-Gm-Message-State: AOAM531WIpNH1wafIKI+OJ1MB/sMELBCnTZBNdKEEHBSf0r8RaKYrg0S XgwZDArJKvf+VgH321GBh/BK+Q== X-Google-Smtp-Source: ABdhPJyvtuKX2zV8mCdrg2NYsULLUlLCccMHLxDM/TG/XquL4LiIlTucJUYDBbZjw339FUqKik+Tow== X-Received: by 2002:ac8:4412:: with SMTP id j18mr8003677qtn.387.1616682860918; Thu, 25 Mar 2021 07:34:20 -0700 (PDT) Received: from ziepe.ca ([206.223.160.26]) by smtp.gmail.com with ESMTPSA id 73sm4206300qkk.131.2021.03.25.07.34.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Mar 2021 07:34:20 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1lPR3z-002fmd-5a; Thu, 25 Mar 2021 11:34:19 -0300 Date: Thu, 25 Mar 2021 11:34:19 -0300 From: Jason Gunthorpe To: Dan Williams Cc: Joao Martins , Christoph Hellwig , Shiyang Ruan , Vishal Verma , Dave Jiang , Ira Weiny , Matthew Wilcox , Jan Kara , Andrew Morton , david , linux-fsdevel , Linux Kernel Mailing List , Linux MM , linux-nvdimm Subject: Re: [PATCH 3/3] mm/devmap: Remove pgmap accounting in the get_user_pages_fast() path Message-ID: <20210325143419.GK2710221@ziepe.ca> References: <161604048257.1463742.1374527716381197629.stgit@dwillia2-desk3.amr.corp.intel.com> <161604050866.1463742.7759521510383551055.stgit@dwillia2-desk3.amr.corp.intel.com> <66514812-6a24-8e2e-7be5-c61e188fecc4@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 33AD52000260 X-Stat-Signature: i4suk1fsuwqgpo5ebpnuxowziq8xi3b8 Received-SPF: none (ziepe.ca>: No applicable sender policy available) receiver=imf28; identity=mailfrom; envelope-from=""; helo=mail-qt1-f174.google.com; client-ip=209.85.160.174 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1616682866-888425 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, Mar 18, 2021 at 10:03:06AM -0700, Dan Williams wrote: > Yes. I still need to answer the question of whether mapping > invalidation triggers longterm pin holders to relinquish their hold, > but that's a problem regardless of whether gup-fast is supported or > not. It does not, GUP users do not interact with addres_space or mmu notifiers Jason