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From: Jane Chu <jane.chu@oracle.com>
To: Dan Williams <dan.j.williams@intel.com>,
	"Darrick J. Wong" <djwong@kernel.org>
Cc: Vishal L Verma <vishal.l.verma@intel.com>,
	Dave Jiang <dave.jiang@intel.com>,
	"Weiny, Ira" <ira.weiny@intel.com>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Matthew Wilcox <willy@infradead.org>, Jan Kara <jack@suse.cz>,
	Linux NVDIMM <nvdimm@lists.linux.dev>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH 0/3] dax: clear poison on the fly along pwrite
Date: Thu, 23 Sep 2021 13:48:52 -0700	[thread overview]
Message-ID: <90031bc1-9bd2-635e-8513-1948204ffcd7@oracle.com> (raw)
In-Reply-To: <CAPcyv4jaCiSXU61gsQTaoN_cdDTDMvFSfMYfBz2yLKx11fdwOQ@mail.gmail.com>

On 9/15/2021 1:27 PM, Dan Williams wrote:
>>> I'm also thinking about the MOVEDIR64B instruction and how it
>>> might be used to clear poison on the fly with a single 'store'.
>>> Of course, that means we need to figure out how to narrow down the
>>> error blast radius first.
> It turns out the MOVDIR64B error clearing idea runs into problem with
> the device poison tracking. Without the explicit notification that
> software wanted the error cleared the device may ghost report errors
> that are not there anymore. I think we should continue explicit error
> clearing and notification of the device that the error has been
> cleared (by asking the device to clear it).

Sorry for the late response, I was out for several days.

Your concern is understood.  I wasn't thinking of an out-of-band
MOVDIR64B to clear poison, I was thinking about adding a case to
pmem_clear_poison(), such that if CPUID feature shows that
MOVDIR64B is supported, instead of calling the BIOS interface
to clear poison, MOVDIR64B could be called. The advantage is
a. a lot faster; b. smaller radius.  And the driver has a chance
to update its ->bb record.


  parent reply	other threads:[~2021-09-23 20:49 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-14 23:31 [PATCH 0/3] dax: clear poison on the fly along pwrite Jane Chu
2021-09-14 23:31 ` [PATCH 1/3] dax: introduce dax_operation dax_clear_poison Jane Chu
2021-11-04 17:53   ` Christoph Hellwig
2021-09-14 23:31 ` [PATCH 2/3] dax: introduce dax_clear_poison to dax pwrite operation Jane Chu
2021-11-04 17:53   ` Christoph Hellwig
2021-09-14 23:31 ` [PATCH 2/3] dax: introduce dax clear poison to page aligned " Jane Chu
2021-09-14 23:31 ` [PATCH 3/3] libnvdimm/pmem: Provide pmem_dax_clear_poison for dax operation Jane Chu
2021-11-04 17:55   ` Christoph Hellwig
2021-11-04 20:27     ` Jane Chu
2021-09-15  4:44 ` [PATCH 0/3] dax: clear poison on the fly along pwrite Dan Williams
2021-09-15  7:22   ` Jane Chu
2021-09-15 16:15     ` Darrick J. Wong
2021-09-15 20:27       ` Dan Williams
2021-09-16  0:05         ` Darrick J. Wong
2021-09-16  7:11         ` Christoph Hellwig
2021-09-16 18:40           ` Dan Williams
2021-09-17 12:53             ` Christoph Hellwig
2021-09-17 15:27               ` Darrick J. Wong
2021-09-17 20:21                 ` Dan Williams
2021-09-18  0:07                   ` Darrick J. Wong
2021-09-17 19:37               ` Dan Williams
2021-09-23 20:48         ` Jane Chu [this message]
2021-09-23 20:55       ` Jane Chu
2021-09-23 21:42         ` Dan Williams

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