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Shutemov" To: Zi Yan Cc: akpm@linux-foundation.org, Andrea Arcangeli , Yang Shi , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: Re: [PATCHv2 1/8] khugepaged: Add self test Message-ID: <20200408142145.workbzv2n3p27y2w@box> References: <20200403112928.19742-1-kirill.shutemov@linux.intel.com> <20200403112928.19742-2-kirill.shutemov@linux.intel.com> <20200406152035.ga7hk6jfaqzvlete@box> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Bogosity: Ham, tests=bogofilter, spamicity=0.007308, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Apr 06, 2020 at 02:50:32PM -0400, Zi Yan wrote: > khugepaged-58 [001] .... 9913.990380: mm_khugepaged_scan_pmd: mm=00000000283d31fc, scan_pfn=0x2ae4bd, writable=0, referenced=512, none_or_zero=0, status=no_writable_page, unmapped=0 Looks like all failures due to lack of writable ptes. That's very strange because we write to the page on fill. You've mentioned that you run it in VM. I wounder if it can be a virtualizaiton artefact. I run tests under KVM and they are fine. What is your virtualization setup? -- Kirill A. Shutemov