From: "Verma, Vishal L" <vishal.l.verma@intel.com>
To: "Williams, Dan J" <dan.j.williams@intel.com>,
"Du, Fan" <fan.du@intel.com>
Cc: "thomas.lendacky@amd.com" <thomas.lendacky@amd.com>,
"mhocko@suse.com" <mhocko@suse.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
"tiwai@suse.de" <tiwai@suse.de>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"Huang, Ying <ying.huang@intel.com>,
linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"jglisse@redhat.com" <jglisse@redhat.com>,
"Wu, Fengguang <fengguang.wu@intel.com>,
baiyaowei@cmss.chinamobile.com" <baiyaowei@cmss.chinamobile.com>,
"zwisler@kernel.org" <zwisler@kernel.org>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"bp@suse.de" <bp@suse.de>
Subject: Re: [PATCH 5/5] dax: "Hotplug" persistent memory for use like normal RAM
Date: Fri, 25 Jan 2019 18:20:56 +0000 [thread overview]
Message-ID: <b7d45d83a314955e7dff25401dfc0d4f4247cfcd.camel@intel.com> (raw)
In-Reply-To: <CAPcyv4ikXD8rJAmV6tGNiq56m_ZXPZNrYkTwOSUJ7D1O_M5s=w@mail.gmail.com>
On Fri, 2019-01-25 at 09:18 -0800, Dan Williams wrote:
> On Fri, Jan 25, 2019 at 12:20 AM Du, Fan <fan.du@intel.com> wrote:
> > Dan
> >
> > Thanks for the insights!
> >
> > Can I say, the UCE is delivered from h/w to OS in a single way in
> > case of machine
> > check, only PMEM/DAX stuff filter out UC address and managed in its
> > own way by
> > badblocks, if PMEM/DAX doesn't do so, then common RAS workflow will
> > kick in,
> > right?
>
> The common RAS workflow always kicks in, it's just the page state
> presented by a DAX mapping needs distinct handling. Once it is
> hot-plugged it no longer needs to be treated differently than "System
> RAM".
>
> > And how about when ARS is involved but no machine check fired for
> > the function
> > of this patchset?
>
> The hotplug effectively disconnects this address range from the ARS
> results. They will still be reported in the libnvdimm "region" level
> badblocks instance, but there's no safe / coordinated way to go clear
> those errors without additional kernel enabling. There is no "clear
> error" semantic for "System RAM".
>
Perhaps as future enabling, the kernel can go perform "clear error" for
offlined pages, and make them usable again. But I'm not sure how
prepared mm is to re-accept pages previously offlined.
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Linux-nvdimm@lists.01.org
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WARNING: multiple messages have this Message-ID (diff)
From: "Verma, Vishal L" <vishal.l.verma@intel.com>
To: "Williams, Dan J" <dan.j.williams@intel.com>,
"Du, Fan" <fan.du@intel.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"bp@suse.de" <bp@suse.de>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"tiwai@suse.de" <tiwai@suse.de>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
"jglisse@redhat.com" <jglisse@redhat.com>,
"zwisler@kernel.org" <zwisler@kernel.org>,
"mhocko@suse.com" <mhocko@suse.com>,
"baiyaowei@cmss.chinamobile.com" <baiyaowei@cmss.chinamobile.com>,
"thomas.lendacky@amd.com" <thomas.lendacky@amd.com>,
"Wu, Fengguang" <fengguang.wu@intel.com>,
"Huang, Ying" <ying.huang@intel.com>,
"jane.chu@oracle.com" <jane.chu@oracle.com>,
"bhelgaas@google.com" <bhelgaas@google.com>
Subject: Re: [PATCH 5/5] dax: "Hotplug" persistent memory for use like normal RAM
Date: Fri, 25 Jan 2019 18:20:56 +0000 [thread overview]
Message-ID: <b7d45d83a314955e7dff25401dfc0d4f4247cfcd.camel@intel.com> (raw)
In-Reply-To: <CAPcyv4ikXD8rJAmV6tGNiq56m_ZXPZNrYkTwOSUJ7D1O_M5s=w@mail.gmail.com>
On Fri, 2019-01-25 at 09:18 -0800, Dan Williams wrote:
> On Fri, Jan 25, 2019 at 12:20 AM Du, Fan <fan.du@intel.com> wrote:
> > Dan
> >
> > Thanks for the insights!
> >
> > Can I say, the UCE is delivered from h/w to OS in a single way in
> > case of machine
> > check, only PMEM/DAX stuff filter out UC address and managed in its
> > own way by
> > badblocks, if PMEM/DAX doesn't do so, then common RAS workflow will
> > kick in,
> > right?
>
> The common RAS workflow always kicks in, it's just the page state
> presented by a DAX mapping needs distinct handling. Once it is
> hot-plugged it no longer needs to be treated differently than "System
> RAM".
>
> > And how about when ARS is involved but no machine check fired for
> > the function
> > of this patchset?
>
> The hotplug effectively disconnects this address range from the ARS
> results. They will still be reported in the libnvdimm "region" level
> badblocks instance, but there's no safe / coordinated way to go clear
> those errors without additional kernel enabling. There is no "clear
> error" semantic for "System RAM".
>
Perhaps as future enabling, the kernel can go perform "clear error" for
offlined pages, and make them usable again. But I'm not sure how
prepared mm is to re-accept pages previously offlined.
next prev parent reply other threads:[~2019-01-25 18:20 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-24 23:14 [PATCH 0/5] [v4] Allow persistent memory to be used like normal RAM Dave Hansen
2019-01-24 23:14 ` Dave Hansen
2019-01-24 23:14 ` Dave Hansen
2019-01-24 23:14 ` [PATCH 1/5] mm/resource: return real error codes from walk failures Dave Hansen
2019-01-24 23:14 ` Dave Hansen
2019-01-24 23:14 ` Dave Hansen
[not found] ` <20190124231442.EFD29EE0-LXbPSdftPKxrdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2019-01-25 21:02 ` Bjorn Helgaas
2019-01-25 21:02 ` Bjorn Helgaas
2019-01-25 21:02 ` Bjorn Helgaas
2019-01-25 21:09 ` Dave Hansen
2019-01-25 21:09 ` Dave Hansen
2019-01-25 21:19 ` Bjorn Helgaas
2019-01-25 21:19 ` Bjorn Helgaas
[not found] ` <4898e064-5298-6a82-83ea-23d16f3dfb3d-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2019-01-29 1:18 ` Michael Ellerman
2019-01-29 1:18 ` Michael Ellerman
2019-01-24 23:14 ` [PATCH 2/5] mm/resource: move HMM pr_debug() deeper into resource code Dave Hansen
2019-01-24 23:14 ` Dave Hansen
2019-01-24 23:14 ` Dave Hansen
2019-01-25 19:07 ` Jerome Glisse
2019-01-25 19:07 ` Jerome Glisse
2019-01-25 21:18 ` Bjorn Helgaas
2019-01-25 21:18 ` Bjorn Helgaas
2019-01-25 21:18 ` Bjorn Helgaas
2019-01-25 21:24 ` Dave Hansen
2019-01-25 21:24 ` Dave Hansen
2019-01-29 1:34 ` Michael Ellerman
2019-01-29 1:34 ` Michael Ellerman
2019-01-24 23:14 ` [PATCH 3/5] mm/memory-hotplug: allow memory resources to be children Dave Hansen
2019-01-24 23:14 ` Dave Hansen
2019-01-24 23:14 ` Dave Hansen
2019-01-24 23:14 ` [PATCH 4/5] dax/kmem: let walk_system_ram_range() search child resources Dave Hansen
2019-01-24 23:14 ` Dave Hansen
2019-01-24 23:14 ` Dave Hansen
2019-01-24 23:14 ` [PATCH 5/5] dax: "Hotplug" persistent memory for use like normal RAM Dave Hansen
2019-01-24 23:14 ` Dave Hansen
2019-01-24 23:14 ` Dave Hansen
2019-01-25 6:13 ` Jane Chu
2019-01-25 6:13 ` Jane Chu
2019-01-25 6:27 ` Dan Williams
2019-01-25 6:27 ` Dan Williams
2019-01-25 8:20 ` Du, Fan
2019-01-25 8:20 ` Du, Fan
2019-01-25 17:18 ` Dan Williams
2019-01-25 18:20 ` Verma, Vishal L [this message]
2019-01-25 18:20 ` Verma, Vishal L
2019-01-25 19:10 ` Jane Chu
2019-01-25 19:15 ` Dan Williams
2019-01-25 19:15 ` Dan Williams
2019-01-25 19:15 ` Dan Williams
2019-01-25 23:30 ` Jane Chu
2019-01-28 9:25 ` Michal Hocko
2019-01-28 16:34 ` Dan Williams
2019-01-28 16:34 ` Dan Williams
2019-01-28 16:34 ` Dan Williams
2019-02-09 11:00 ` Brice Goglin
2019-02-11 16:22 ` Dave Hansen
2019-02-11 16:22 ` Dave Hansen
2019-02-12 19:59 ` Brice Goglin
2019-02-13 0:30 ` Dan Williams
2019-02-13 0:30 ` Dan Williams
2019-02-13 8:12 ` Brice Goglin
2019-02-13 8:12 ` Brice Goglin
2019-02-13 8:24 ` Dan Williams
2019-02-13 8:24 ` Dan Williams
2019-02-13 8:43 ` Brice Goglin
2019-02-13 8:43 ` Brice Goglin
2019-02-13 13:06 ` Brice Goglin
2019-02-13 13:06 ` Brice Goglin
2019-02-13 16:19 ` Dan Williams
2019-02-13 16:19 ` Dan Williams
2019-01-25 19:08 ` [PATCH 0/5] [v4] Allow persistent memory to be used " Jerome Glisse
2019-01-25 19:08 ` Jerome Glisse
2019-01-28 11:09 ` Balbir Singh
2019-01-28 11:09 ` Balbir Singh
2019-01-28 16:50 ` Dave Hansen
2019-01-28 16:50 ` Dave Hansen
2019-01-28 16:50 ` Dave Hansen
2019-02-25 18:57 [PATCH 0/5] [v5] " Dave Hansen
2019-02-25 18:57 ` [PATCH 5/5] dax: "Hotplug" persistent memory for use " Dave Hansen
2019-02-25 18:57 ` Dave Hansen
2019-02-25 18:57 ` Dave Hansen
2019-02-25 22:56 ` Verma, Vishal L
2019-02-25 22:56 ` Verma, Vishal L
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