From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx181.postini.com [74.125.245.181]) by kanga.kvack.org (Postfix) with SMTP id D52F96B0005 for ; Thu, 11 Apr 2013 09:00:53 -0400 (EDT) Received: by mail-pa0-f42.google.com with SMTP id kq13so889800pab.29 for ; Thu, 11 Apr 2013 06:00:53 -0700 (PDT) Message-ID: <5166B3FE.4000002@gmail.com> Date: Thu, 11 Apr 2013 21:00:46 +0800 From: Ric Mason MIME-Version: 1.0 Subject: Re: [RFC Patch 0/2] mm: Add parameters to make kernel behavior at memory error on dirty cache selectable References: <51662D5B.3050001@hitachi.com> <516633BB.40307@gmail.com> <5166B1DF.8070504@hitachi.com> In-Reply-To: <5166B1DF.8070504@hitachi.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Mitsuhiro Tanino Cc: Simon Jeons , Andi Kleen , linux-kernel , linux-mm 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 > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@kvack.org. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: email@kvack.org -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org