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Fri, 6 Aug 2021 01:17:37 +0000 Received: from SJ0PR10MB4429.namprd10.prod.outlook.com ([fe80::51f7:787e:80e5:6434]) by SJ0PR10MB4429.namprd10.prod.outlook.com ([fe80::51f7:787e:80e5:6434%3]) with mapi id 15.20.4373.027; Fri, 6 Aug 2021 01:17:37 +0000 Subject: Re: [PATCH RESEND v6 1/9] pagemap: Introduce ->memory_failure() 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> From: Jane Chu Organization: Oracle Corporation Message-ID: <1d286104-28f4-d442-efed-4344eb8fa5a1@oracle.com> Date: Thu, 5 Aug 2021 18:17:33 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 In-Reply-To: <20210730100158.3117319-2-ruansy.fnst@fujitsu.com> Content-Type: text/plain; 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dkim=pass header.d=oracle.com header.s=corp-2021-07-09 header.b=Wa3Mhiyc; dkim=pass header.d=oracle.com header.s=corp-2020-01-29 header.b=pnDXPI7K; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=sv8324DS; dmarc=pass (policy=none) header.from=oracle.com; spf=none (imf13.hostedemail.com: domain of jane.chu@oracle.com has no SPF policy when checking 205.220.165.32) smtp.mailfrom=jane.chu@oracle.com X-Stat-Signature: o7hnojz51sz5zjzunkgrigogzh4wga6i X-Rspamd-Queue-Id: 93845101C9FE X-Rspamd-Server: rspam01 X-HE-Tag: 1628212667-556581 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: The filesystem part of the pmem failure handling is at minimum built on PAGE_SIZE granularity - an inheritance from general memory_failure handling. However, with Intel's DCPMEM technology, the error blast radius is no more than 256bytes, and might get smaller with future hardware generation, also advanced atomic 64B write to clear the poison. 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 implemented > by each kind of devices. For the fsdax case, pmem device driver > implements it. Pmem device driver will find out the filesystem in which > the corrupted page located in. And finally call filesystem handler to > deal with this error. > > The filesystem will try to recover the corrupted data if necessary.