linux-kernel - [PATCH V4 0/3 RESEND] MCE: fix an error of mce_bad

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Message-ID: <50CA8B92.6070001@huawei.com>
Date:	Fri, 14 Dec 2012 10:14:42 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Xishi Qiu <qiuxishi@...wei.com>, WuJianguo <wujianguo@...wei.com>,
	Liujiang <jiang.liu@...wei.com>,
	Simon Jeons <simon.jeons@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Andi Kleen <andi@...stfloor.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	<n-horiguchi@...jp.nec.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH V4 0/3 RESEND] MCE: fix an error of mce_bad_pages statistics

$ echo paddr > /sys/devices/system/memory/soft_offline_page to offline a
*free* page, the value of mce_bad_pages will be added, and the page is set
HWPoison flag, but it is still managed by page buddy alocator.

$ cat /proc/meminfo | grep HardwareCorrupted shows the value.

If we offline the same page, the value of mce_bad_pages will be added
*again*, this means the value is incorrect now. Assume the page is
still free during this short time.

soft_offline_page()
	get_any_page()
		"else if (is_free_buddy_page(p))" branch return 0
			"goto done";
				"atomic_long_add(1, &mce_bad_pages);"

Changelog:
V4:
	-use num_poisoned_pages instead of mce_bad_pages
	-remove page lock
V3:
	-add page lock when set HWPoison flag
	-adjust the function structure
V2 and V1:
	-fix the error

Xishi Qiu (3):
  move-poisoned-page-check-at-the-beginning-of-the-function
  fix-function-structure
  use-num_poisoned_pages-instead-of-mce_bad_pages

 fs/proc/meminfo.c   |    2 +-
 include/linux/mm.h  |    2 +-
 mm/memory-failure.c |   76 ++++++++++++++++++++++++++-------------------------
 3 files changed, 41 insertions(+), 39 deletions(-)


.


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