linux-kernel - Re: [RFC Patch 0/2] mm: Add parameters to make kernel behavior at memory error on dirty cache selectable

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Message-ID: <5166B3FE.4000002@gmail.com>
Date:	Thu, 11 Apr 2013 21:00:46 +0800
From:	Ric Mason <ric.masonn@...il.com>
To:	Mitsuhiro Tanino <mitsuhiro.tanino.gm@...achi.com>
CC:	Simon Jeons <simon.jeons@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [RFC Patch 0/2] mm: Add parameters to make kernel behavior at
 memory error on dirty cache selectable

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?

>
> 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?

> and OS handles the SRAO error using hwpoison function.
>
> Regards,
> Mitsuhiro Tanino
>
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