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X-CSE-ConnectionGUID: vRoMpdzYTv+T2Mv2ZJMnAw== X-CSE-MsgGUID: c5+K4icoRSCwtLm/VzjsWg== X-IronPort-AV: E=McAfee;i="6700,10204,11116"; a="20593227" X-IronPort-AV: E=Sophos;i="6.09,168,1716274800"; d="scan'208";a="20593227" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by fmvoesa106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jun 2024 22:27:48 -0700 X-CSE-ConnectionGUID: qrvTILA6TI6zx5MgNg1xmw== X-CSE-MsgGUID: W50Q72weR1SfU3HNkX4jxA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,168,1716274800"; d="scan'208";a="49085086" Received: from tassilo.jf.intel.com (HELO tassilo.localdomain) ([10.54.38.190]) by fmviesa005.fm.intel.com with ESMTP; 27 Jun 2024 22:27:48 -0700 Received: by tassilo.localdomain (Postfix, from userid 1000) id E9A88302A3B; Thu, 27 Jun 2024 22:27:47 -0700 (PDT) From: Andi Kleen To: Ruidong Tian Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, nao.horiguchi@gmail.com, linmiaohe@huawei.com, tianruidong@alibaba.linux.com, xueshuai@linux.alibaba.com Subject: Re: [PATCH] mm/hwpoison: avoid speculation access after soft/hard offline In-Reply-To: <20240628033509.27612-1-tianruidong@linux.alibaba.com> (Ruidong Tian's message of "Fri, 28 Jun 2024 11:35:09 +0800") References: <20240628033509.27612-1-tianruidong@linux.alibaba.com> Date: Thu, 27 Jun 2024 22:27:47 -0700 Message-ID: <871q4hzlf0.fsf@linux.intel.com> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: CD53D180015 X-Stat-Signature: bh8kqb3bi63st6azkfujnumoroyuespi X-Rspam-User: X-HE-Tag: 1719552469-12980 X-HE-Meta: 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 Age5hwBZ JiDVNXXOb8WAgjGOuk/HPJn7ZRuIwoxJYijQtnTCw/v+KDaZara+TxZtuXdsWWwJu1CV25r7ut7BhULgU5Q//qDAZN8TwykbtCHxw1djyJYRH+3dd2JVXJqIvaLzvnYZnvJtKjR3OSlcAL8DdnxNODkXcYAz+1815FdRiR+t9auU2VFKG98p6Zul7gLZLJFDiMQ7s X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Ruidong Tian writes: > Page that offlined can report CE/UE event due to speculation access. > Delete kernel 1:1 linner mapping after soft/hard offline to avoid it. But that will split the large pages for the direct mapping, costing you every time there is TLB pressure. You can probably do the math, with enough uptime and a reasonable error rate aand this patch there might be not even be 2MB pages left at some point. Cheaper to just ignore them, since they shouldn't cause any other problems. -Andi