linux-kernel - Re: [PATCH V2] MCE: fix an error of mce_bad

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Message-ID: <20121211025857.GX16230@one.firstfloor.org>
Date:	Tue, 11 Dec 2012 03:58:57 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	Xishi Qiu <qiuxishi@...wei.com>, Andi Kleen <andi@...stfloor.org>,
	Simon Jeons <simon.jeons@...il.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	WuJianguo <wujianguo@...wei.com>,
	Liujiang <jiang.liu@...wei.com>, Vyacheslav.Dubeyko@...wei.com,
	Borislav Petkov <bp@...en8.de>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, wency@...fujitsu.com,
	Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH V2] MCE: fix an error of mce_bad_pages statistics

> That sounds like overkill. There are not so many free pages in a
> typical server system.

As Fengguang said -- memory error handling is tricky. Lots of things
could be done in theory, but they all have a cost in testing and 
maintenance. 

In general they are only worth doing if the situation is common and
represents a significant percentage of the total pages of a relevant server
workload.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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