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Mon, 8 Feb 2021 23:30:03 +0000 (UTC) IronPort-SDR: fM6Hga3nCi93I3Wj34YvdvY7gGE/BSI2d+kTJ65Yiq/W/EMV0IFBZ5Tq3wlb2qpB28qjrsl5QX gjj2bF+Wl08Q== X-IronPort-AV: E=McAfee;i="6000,8403,9889"; a="181019116" X-IronPort-AV: E=Sophos;i="5.81,163,1610438400"; d="scan'208";a="181019116" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Feb 2021 15:30:01 -0800 IronPort-SDR: clCj60RdzLcq+1wGchwR0L2gVy+72jmFNyDm4l3plYEoEm4U46vZmmvtaD9CJWfe/0zyX54JCT z0Egamg+ua8Q== X-IronPort-AV: E=Sophos;i="5.81,163,1610438400"; d="scan'208";a="435840280" Received: from mbrandt-mobl.amr.corp.intel.com (HELO [10.212.254.119]) ([10.212.254.119]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Feb 2021 15:30:01 -0800 Subject: Re: [PATCH V6] x86/mm: Tracking linear mapping split events To: Saravanan D , x86@kernel.org, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, willy@infradead.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, linux-mm@kvack.org, songliubraving@fb.com, tj@kernel.org, hannes@cmpxchg.org References: <20210128212048.oopcyfdf4j2lc663@devvm1945.atn0.facebook.com> <20210128233430.1460964-1-saravanand@fb.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210128233430.1460964-1-saravanand@fb.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit 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 1/28/21 3:34 PM, Saravanan D wrote: > > One of the many lasting sources of direct hugepage splits is kernel > tracing (kprobes, tracepoints). > > Note that the kernel's code segment [512 MB] points to the same > physical addresses that have been already mapped in the kernel's > direct mapping range. Looks fine to me: Acked-by: Dave Hansen