From: "Elliott, Robert (Persistent Memory)" <elliott@hpe.com>
To: "Luck, Tony" <tony.luck@intel.com>, Borislav Petkov <bp@suse.de>
Cc: Dave Hansen <dave.hansen@intel.com>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
"x86@kernel.org" <x86@kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Yazen Ghannam <yazen.ghannam@amd.com>,
"Kani, Toshimitsu" <toshi.kani@hpe.com>,
"'dan.j.williams@intel.com'" <dan.j.williams@intel.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>
Subject: RE: [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison pages
Date: Fri, 23 Jun 2017 22:19:35 +0000 [thread overview]
Message-ID: <AT5PR84MB00823EB30BD7BF0EA3DAFF0BABD80@AT5PR84MB0082.NAMPRD84.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <20170621174740.npbtg2e4o65tyrss@intel.com>
> > > + if (set_memory_np(decoy_addr, 1))
> > > + pr_warn("Could not invalidate pfn=0x%lx from 1:1 map \n",
Another concept to consider is mapping the page as UC rather than
completely unmapping it.
The uncorrectable error scope could be smaller than a page size, like:
* memory ECC width (e.g., 8 bytes)
* cache line size (e.g., 64 bytes)
* block device logical block size (e.g., 512 bytes, for persistent memory)
UC preserves the ability to access adjacent data within the page that
hasn't gone bad, and is particularly useful for persistent memory.
---
Robert Elliott, HPE Persistent Memory
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next prev parent reply other threads:[~2017-06-23 22:20 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-16 19:02 [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison pages Luck, Tony
2017-06-19 18:01 ` Borislav Petkov
2017-06-21 17:47 ` Luck, Tony
2017-06-21 19:59 ` Elliott, Robert (Persistent Memory)
2017-06-21 20:19 ` Luck, Tony
2017-06-22 9:39 ` Borislav Petkov
2017-06-29 22:11 ` git send-email (w/o Cc: stable) Luck, Tony
2017-06-30 7:08 ` Borislav Petkov
2017-06-23 22:19 ` Elliott, Robert (Persistent Memory) [this message]
2017-06-27 22:04 ` [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison pages Luck, Tony
2017-06-27 22:09 ` Dan Williams
2017-08-16 17:18 ` [PATCH-resend] " Luck, Tony
2017-08-17 22:09 ` Andrew Morton
2017-08-17 22:29 ` Elliott, Robert (Persistent Memory)
2017-08-17 23:32 ` Luck, Tony
2017-06-21 2:12 ` [PATCH] " Naoya Horiguchi
2017-06-21 17:54 ` Luck, Tony
2017-06-21 19:47 ` Elliott, Robert (Persistent Memory)
2017-06-21 20:30 ` Luck, Tony
2017-06-23 5:07 ` Dan Williams
2017-06-23 20:59 ` Luck, Tony
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