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Wed, 18 Aug 2021 06:08:44 +0000 Received: from SJ0PR10MB4429.namprd10.prod.outlook.com ([fe80::bc10:efd4:f1f4:31c7]) by SJ0PR10MB4429.namprd10.prod.outlook.com ([fe80::bc10:efd4:f1f4:31c7%5]) with mapi id 15.20.4415.024; Wed, 18 Aug 2021 06:08:44 +0000 Subject: Re: [PATCH RESEND v6 1/9] pagemap: Introduce ->memory_failure() From: Jane Chu To: Shiyang Ruan , linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, nvdimm@lists.linux.dev, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, dm-devel@redhat.com Cc: djwong@kernel.org, dan.j.williams@intel.com, david@fromorbit.com, hch@lst.de, agk@redhat.com, snitzer@redhat.com References: <20210730100158.3117319-1-ruansy.fnst@fujitsu.com> <20210730100158.3117319-2-ruansy.fnst@fujitsu.com> <1d286104-28f4-d442-efed-4344eb8fa5a1@oracle.com> Organization: Oracle Corporation Message-ID: <78c22960-3f6d-8e5d-890a-72915236bedc@oracle.com> Date: Tue, 17 Aug 2021 23:08:40 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 In-Reply-To: Content-Type: text/plain; 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dkim=pass header.d=oracle.com header.s=corp-2021-07-09 header.b="FIZ1/RRh"; dkim=pass header.d=oracle.com header.s=corp-2020-01-29 header.b=EL52k3dB; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b="aDla9B/b"; spf=none (imf02.hostedemail.com: domain of jane.chu@oracle.com has no SPF policy when checking 205.220.177.32) smtp.mailfrom=jane.chu@oracle.com; dmarc=pass (policy=none) header.from=oracle.com X-Rspamd-Server: rspam01 X-Stat-Signature: 9co4frtffej8t48pu5cg5w8xwhyki4aw X-HE-Tag: 1629266933-791625 Content-Transfer-Encoding: quoted-printable 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 8/17/2021 10:43 PM, Jane Chu wrote: > More information - >=20 > On 8/16/2021 10:20 AM, Jane Chu wrote: >> Hi, ShiYang, >> >> So I applied the v6 patch series to my 5.14-rc3 as it's what you=20 >> indicated is what v6 was based at, and injected a hardware poison. >> >> I'm seeing the same problem that was reported a while ago after the >> poison was consumed - in the SIGBUS payload, the si_addr is missing: >> >> ** SIGBUS(7): canjmp=3D1, whichstep=3D0, ** >> ** si_addr(0x(nil)), si_lsb(0xC), si_code(0x4, BUS_MCEERR_AR) ** >> >> The si_addr ought to be 0x7f6568000000 - the vaddr of the first page >> in this case. >=20 > The failure came from here : >=20 > [PATCH RESEND v6 6/9] xfs: Implement ->notify_failure() for XFS >=20 > +static int > +xfs_dax_notify_failure( > ... > +=C2=A0=C2=A0=C2=A0 if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) { > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 xfs_warn(mp, "notify_failur= e() needs rmapbt enabled!"); > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return -EOPNOTSUPP; > +=C2=A0=C2=A0=C2=A0 } >=20 > I am not familiar with XFS, but I have a few questions I hope to get=20 > answers - >=20 > 1) What does it take and cost to make > =C2=A0=C2=A0 xfs_sb_version_hasrmapbt(&mp->m_sb) to return true? >=20 > 2) For a running environment that fails the above check, is it > =C2=A0=C2=A0 okay to leave the poison handle in limbo and why? >=20 > 3) If the above regression is not acceptable, any potential remedy? How about moving the check to prior to the notifier registration? And register only if the check is passed? This seems better than an alternative which is to fall back to the legacy memory_failure handling in case the filesystem returns -EOPNOTSUPP. thanks, -jane >=20 > thanks! > -jane >=20 >=20 >> >> Something is not right... >> >> thanks, >> -jane >> >> >> On 8/5/2021 6:17 PM, Jane Chu wrote: >>> The filesystem part of the pmem failure handling is at minimum built >>> on PAGE_SIZE granularity - an inheritance from general memory_failure= =20 >>> handling.=C2=A0 However, with Intel's DCPMEM technology, the error bl= ast >>> radius is no more than 256bytes, and might get smaller with future >>> hardware generation, also advanced atomic 64B write to clear the pois= on. >>> But I don't see any of that could be incorporated in, given that the >>> filesystem is notified a corruption with pfn, rather than an exact >>> address. >>> >>> So I guess this question is also for Dan: how to avoid unnecessarily >>> repairing a PMD range for a 256B corrupt range going forward? >>> >>> thanks, >>> -jane >>> >>> >>> On 7/30/2021 3:01 AM, Shiyang Ruan wrote: >>>> When memory-failure occurs, we call this function which is implement= ed >>>> by each kind of devices.=C2=A0 For the fsdax case, pmem device drive= r >>>> implements it.=C2=A0 Pmem device driver will find out the filesystem= in=20 >>>> which >>>> the corrupted page located in.=C2=A0 And finally call filesystem han= dler to >>>> deal with this error. >>>> >>>> The filesystem will try to recover the corrupted data if necessary. >>> >> >=20