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[71.184.117.43]) by smtp.gmail.com with ESMTPSA id y46sm15495940qth.78.2020.08.10.20.45.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Aug 2020 20:45:37 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: Qian Cai Mime-Version: 1.0 (1.0) Subject: Re: [PATCH v6 00/12] HWPOISON: soft offline rework Date: Mon, 10 Aug 2020 23:45:36 -0400 Message-Id: <6214D3DD-7EB1-4598-8DA2-344430EC7858@lca.pw> References: <20200811031139.GA7145@hori.linux.bs1.fc.nec.co.jp> Cc: "nao.horiguchi@gmail.com" , "linux-mm@kvack.org" , "mhocko@kernel.org" , "akpm@linux-foundation.org" , "mike.kravetz@oracle.com" , "osalvador@suse.de" , "tony.luck@intel.com" , "david@redhat.com" , "aneesh.kumar@linux.vnet.ibm.com" , "zeil@yandex-team.ru" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "catalin.marinas@arm.com" , "will@kernel.org" In-Reply-To: <20200811031139.GA7145@hori.linux.bs1.fc.nec.co.jp> To: =?utf-8?Q? "HORIGUCHI_NAOYA=28=E5=A0=80=E5=8F=A3=E3=80=80=E7=9B=B4?= =?utf-8?Q?=E4=B9=9F=29" ?= X-Mailer: iPhone Mail (17F80) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Aug 10, 2020, at 11:11 PM, HORIGUCHI NAOYA(=E5=A0=80=E5=8F=A3=E3=80=80=E7= =9B=B4=E4=B9=9F) wrote: >=20 > I'm still not sure why the test succeeded by reverting these because > current mainline kernel provides similar mechanism to prevent reuse of > soft offlined page. So this success seems to me something suspicious. Even if we call munmap() on the range, it still can=E2=80=99t be be reused? I= f so, how to recover those memory then? >=20 > To investigate more, I want to have additional info about the page states > of the relevant pages after soft offlining. Could you collect it by the > following steps? Do you want to collect those from the failed or succeed kernel?=