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[178.121.212.137]) by smtp.gmail.com with ESMTPSA id h8sm678784ejf.73.2019.05.14.06.16.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 14 May 2019 06:16:53 -0700 (PDT) Received: by box.localdomain (Postfix, from userid 1000) id F1D16100C33; Tue, 14 May 2019 15:28:20 +0300 (+03) Date: Tue, 14 May 2019 15:28:20 +0300 From: "Kirill A. Shutemov" To: Larry Bassel Cc: mike.kravetz@oracle.com, willy@infradead.org, dan.j.williams@intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org Subject: Re: [PATCH, RFC 0/2] Share PMDs for FS/DAX on x86 Message-ID: <20190514122820.26zddpb27uxgrwzp@box> References: <1557417933-15701-1-git-send-email-larry.bassel@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1557417933-15701-1-git-send-email-larry.bassel@oracle.com> User-Agent: NeoMutt/20180716 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000006, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, May 09, 2019 at 09:05:31AM -0700, Larry Bassel wrote: > This patchset implements sharing of page table entries pointing > to 2MiB pages (PMDs) for FS/DAX on x86. -EPARSE. How do you share entries? Entries do not take any space, page tables that cointain these entries do. Have you checked if the patch makes memory consumption any better. I have doubts in it.