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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id d37si20381340plb.140.2019.02.20.07.20.57 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 20 Feb 2019 07:20:58 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of batv+a6035ce01c0cd448ed71+5659+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) client-ip=2607:7c80:54:e::133; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=WIGucUyB; spf=pass (google.com: best guess record for domain of batv+a6035ce01c0cd448ed71+5659+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=BATV+a6035ce01c0cd448ed71+5659+infradead.org+hch@bombadil.srs.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=EFeifr+GfaKqX300Um+mjNzD3Rm1S0esXSt0B9w2YGY=; b=WIGucUyBjsGVWuL2jvGEP36J7 wAIM66Nws+XW3bCRdl88lmFalND8Uqloj60hjuL97/UwAqCvwAh/q71HAghQoAiJxUBKDV4NeFs+P HVl2PIkFym1snOkp7H0Bh7Iwy3HNth61esVAhkupONHYlLPFOyNBcP6ioDPUrT9m8HmSlz0Cy7brW T3CThrxzbkECUC+LLP/75uJ0vWxiD0QDLR28VwL+hwhNu5iUxu99KR6fznvbiQWa2uKqaDKSSWHwd 5uLNPR4nLxuoKU8lEnZ+ly+ElHLeYkLQbpv5lMqHn24WHv224i/dDaYfT4EtkA5c0+hIF01oAUZ5T N7tedkzRQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1gwTek-00048O-OH; Wed, 20 Feb 2019 15:19:30 +0000 Date: Wed, 20 Feb 2019 07:19:30 -0800 From: Christoph Hellwig To: ira.weiny@intel.com Cc: John Hubbard , Andrew Morton , Michal Hocko , "Kirill A. Shutemov" , Peter Zijlstra , Jason Gunthorpe , Benjamin Herrenschmidt , Paul Mackerras , "David S. Miller" , Martin Schwidefsky , Heiko Carstens , Rich Felker , Yoshinori Sato , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Ralf Baechle , Paul Burton , James Hogan , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, kvm-ppc@vger.kernel.org, kvm@vger.kernel.org, linux-fpga@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, linux-scsi@vger.kernel.org, devel@driverdev.osuosl.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-fbdev@vger.kernel.org, xen-devel@lists.xenproject.org, devel@lists.orangefs.org, ceph-devel@vger.kernel.org, rds-devel@oss.oracle.com Subject: Re: [RESEND PATCH 0/7] Add FOLL_LONGTERM to GUP fast and use it Message-ID: <20190220151930.GB11695@infradead.org> References: <20190220053040.10831-1-ira.weiny@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190220053040.10831-1-ira.weiny@intel.com> User-Agent: Mutt/1.9.2 (2017-12-15) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html 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, Feb 19, 2019 at 09:30:33PM -0800, ira.weiny@intel.com wrote: > From: Ira Weiny > > Resending these as I had only 1 minor comment which I believe we have covered > in this series. I was anticipating these going through the mm tree as they > depend on a cleanup patch there and the IB changes are very minor. But they > could just as well go through the IB tree. > > NOTE: This series depends on my clean up patch to remove the write parameter > from gup_fast_permitted()[1] > > HFI1, qib, and mthca, use get_user_pages_fast() due to it performance > advantages. These pages can be held for a significant time. But > get_user_pages_fast() does not protect against mapping of FS DAX pages. This I don't get - if you do lock down long term mappings performance of the actual get_user_pages call shouldn't matter to start with. What do I miss?