| To: | Vishal Verma <vishal.l.verma@xxxxxxxxx> |
|---|---|
| Subject: | Re: [RFC PATCH 2/2] xfs: initial/partial support for badblocks |
| From: | Dan Williams <dan.j.williams@xxxxxxxxx> |
| Date: | Fri, 17 Jun 2016 15:27:51 -0700 |
| Cc: | "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>, linux-nvdimm <linux-nvdimm@xxxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, XFS Developers <xfs@xxxxxxxxxxx> |
| Delivered-to: | xfs@xxxxxxxxxxx |
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On Fri, Jun 17, 2016 at 1:32 PM, Vishal Verma <vishal.l.verma@xxxxxxxxx> wrote: >> What happens if pmem signals a bad block and we try to read anyway? I know >> about the read-error-MCE thing, but what's the "more expensive" alternative? >> CPU exception? > > MCE is the CPU exception, and is what we want to avoid at all costs, as > it can cause the machine to crash. The MCE being fatal vs recoverable is the difference between platforms that must avoid badblocks vs those that can consume them and keep going. |
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