From: Simon Jeons <simon.jeons@gmail.com>
To: Mitsuhiro Tanino <mitsuhiro.tanino.gm@hitachi.com>
Cc: Ric Mason <ric.masonn@gmail.com>,
Andi Kleen <andi@firstfloor.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>
Subject: Re: [RFC Patch 0/2] mm: Add parameters to make kernel behavior at memory error on dirty cache selectable
Date: Wed, 17 Apr 2013 13:49:46 +0800 [thread overview]
Message-ID: <516E37FA.4020000@gmail.com> (raw)
In-Reply-To: <51680F97.3020407@hitachi.com>
Hi Mitsuhiro,
On 04/12/2013 09:43 PM, Mitsuhiro Tanino wrote:
> (2013/04/11 22:00), Ric Mason wrote:
>> Hi Mitsuhiro,
>> On 04/11/2013 08:51 PM, Mitsuhiro Tanino wrote:
>>> (2013/04/11 12:53), Simon Jeons wrote:
>>>> One question against mce instead of the patchset. ;-)
>>>>
>>>> When check memory is bad? Before memory access? Is there a process scan it period?
>>> Hi Simon-san,
>>>
>>> Yes, there is a process to scan memory periodically.
>>>
>>> At Intel Nehalem-EX and CPUs after Nehalem-EX generation, MCA recovery
>>> is supported. MCA recovery provides error detection and isolation
>>> features to work together with OS.
>>> One of the MCA Recovery features is Memory Scrubbing. It periodically
>>> checks memory in the background of OS.
>> Memory Scrubbing is a kernel thread? Where is the codes of memory scrubbing?
> Hi Ric,
>
> No. One of the MCA Recovery features is Memory Scrubbing.
Memory Scrubbing is a process in CPU?
> And Memory Scrubbing is a hardware feature of Intel CPU.
>
> OS has a hwpoison feature which is included at mm/memory-failure.c.
> A main function is memory_failure().
>
> If Memory Scrubbing finds a memory error, MCA recovery notifies SRAO error
> into OS and OS handles the SRAO error using hwpoison function.
>
>
>>> If Memory Scrubbing find an uncorrectable error on a memory before
>>> OS accesses the memory bit, MCA recovery notifies SRAO error into OS
>> It maybe can't find memory error timely since it is sleeping when memory error occur, can this case happened?
> Memory Scrubbing seems to be operated periodically but I don't have
> information about how oftern it is executed.
If Memory Scurbbing doesn't catch memory error timely, who will send
SRAR into OS?
>
> Regards,
> Mitsuhiro Tanino
>
> --
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> see: http://www.linux-mm.org/ .
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next prev parent reply other threads:[~2013-04-17 5:49 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-11 3:26 [RFC Patch 0/2] mm: Add parameters to make kernel behavior at memory error on dirty cache selectable Mitsuhiro Tanino
2013-04-11 3:53 ` Simon Jeons
2013-04-11 12:51 ` Mitsuhiro Tanino
2013-04-11 13:00 ` Ric Mason
2013-04-12 13:43 ` Mitsuhiro Tanino
2013-04-17 5:49 ` Simon Jeons [this message]
2013-04-11 7:11 ` Naoya Horiguchi
2013-04-12 13:24 ` Mitsuhiro Tanino
2013-04-12 14:45 ` Naoya Horiguchi
2013-04-17 7:14 ` Simon Jeons
2013-04-17 14:55 ` Naoya Horiguchi
2013-04-18 0:27 ` Simon Jeons
2013-04-11 13:49 ` Andi Kleen
2013-04-11 15:23 ` Naoya Horiguchi
2013-04-11 18:10 ` Andi Kleen
2013-04-12 13:38 ` Mitsuhiro Tanino
2013-04-12 15:13 ` Naoya Horiguchi
2013-04-17 13:58 ` Naoya Horiguchi
2013-04-17 6:42 ` Simon Jeons
2013-04-17 14:16 ` Naoya Horiguchi
2013-04-17 5:30 ` Simon Jeons
2013-04-11 15:15 ` KOSAKI Motohiro
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