From: Fengguang Wu <fengguang.wu@intel.com>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi.kleen@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Tony Luck <tony.luck@intel.com>, Rik van Riel <riel@redhat.com>,
"Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] HWPOISON: fix action_result() to print out dirty/clean
Date: Thu, 23 Aug 2012 17:33:30 +0800 [thread overview]
Message-ID: <20120823093330.GC12745@localhost> (raw)
In-Reply-To: <1345648655-4497-2-git-send-email-n-horiguchi@ah.jp.nec.com>
On Wed, Aug 22, 2012 at 11:17:33AM -0400, Naoya Horiguchi wrote:
> action_result() fails to print out "dirty" even if an error occurred on a
> dirty pagecache, because when we check PageDirty in action_result() it was
> cleared after page isolation even if it's dirty before error handling. This
> can break some applications that monitor this message, so should be fixed.
>
> There are several callers of action_result() except page_action(), but
> either of them are not for LRU pages but for free pages or kernel pages,
> so we don't have to consider dirty or not for them.
>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> Reviewed-by: Andi Kleen <ak@linux.intel.com>
> ---
> mm/memory-failure.c | 22 +++++++++-------------
> 1 file changed, 9 insertions(+), 13 deletions(-)
>
> diff --git v3.6-rc1.orig/mm/memory-failure.c v3.6-rc1/mm/memory-failure.c
> index a6e2141..79dfb2f 100644
> --- v3.6-rc1.orig/mm/memory-failure.c
> +++ v3.6-rc1/mm/memory-failure.c
> @@ -779,16 +779,16 @@ static struct page_state {
> { compound, compound, "huge", me_huge_page },
> #endif
>
> - { sc|dirty, sc|dirty, "swapcache", me_swapcache_dirty },
> - { sc|dirty, sc, "swapcache", me_swapcache_clean },
> + { sc|dirty, sc|dirty, "dirty swapcache", me_swapcache_dirty },
> + { sc|dirty, sc, "clean swapcache", me_swapcache_clean },
>
> - { unevict|dirty, unevict|dirty, "unevictable LRU", me_pagecache_dirty},
> - { unevict, unevict, "unevictable LRU", me_pagecache_clean},
> + { unevict|dirty, unevict|dirty, "dirty unevictable LRU", me_pagecache_dirty },
> + { unevict, unevict, "clean unevictable LRU", me_pagecache_clean },
>
> - { mlock|dirty, mlock|dirty, "mlocked LRU", me_pagecache_dirty },
> - { mlock, mlock, "mlocked LRU", me_pagecache_clean },
> + { mlock|dirty, mlock|dirty, "dirty mlocked LRU", me_pagecache_dirty },
> + { mlock, mlock, "clean mlocked LRU", me_pagecache_clean },
>
> - { lru|dirty, lru|dirty, "LRU", me_pagecache_dirty },
> + { lru|dirty, lru|dirty, "dirty LRU", me_pagecache_dirty },
> { lru|dirty, lru, "clean LRU", me_pagecache_clean },
According to the set_page_dirty() comment, the dirty bit might be set
outside the page lock (however I don't know any concrete examples).
That means the word "clean" is not 100% right. That's probably why we
only report "dirty LRU" and didn't say "clean LRU".
Thanks,
Fengguang
> /*
> @@ -812,12 +812,8 @@ static struct page_state {
>
> static void action_result(unsigned long pfn, char *msg, int result)
> {
> - struct page *page = pfn_to_page(pfn);
> -
> - printk(KERN_ERR "MCE %#lx: %s%s page recovery: %s\n",
> - pfn,
> - PageDirty(page) ? "dirty " : "",
> - msg, action_name[result]);
> + pr_err("MCE %#lx: %s page recovery: %s\n",
> + pfn, msg, action_name[result]);
> }
>
> static int page_action(struct page_state *ps, struct page *p,
> --
> 1.7.11.4
next prev parent reply other threads:[~2012-08-23 9:33 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-22 15:17 [PATCH 0/3 v2] HWPOISON: improve dirty pagecache error reporting Naoya Horiguchi
2012-08-22 15:17 ` [PATCH 1/3] HWPOISON: fix action_result() to print out dirty/clean Naoya Horiguchi
2012-08-23 9:33 ` Fengguang Wu [this message]
2012-08-23 20:31 ` Naoya Horiguchi
2012-08-22 15:17 ` [PATCH 2/3] HWPOISON: report sticky EIO for poisoned file Naoya Horiguchi
2012-08-23 9:22 ` Fengguang Wu
2012-08-23 20:31 ` Naoya Horiguchi
2012-08-22 15:17 ` [PATCH 3/3] HWPOISON: prevent inode cache removal to keep AS_HWPOISON sticky Naoya Horiguchi
2012-08-23 9:11 ` Fengguang Wu
2012-08-23 20:31 ` Naoya Horiguchi
2012-08-24 21:52 ` Naoya Horiguchi
2012-08-24 1:31 ` Dave Chinner
2012-08-24 2:39 ` Naoya Horiguchi
2012-08-24 4:39 ` Dave Chinner
2012-08-24 17:24 ` Naoya Horiguchi
2012-08-26 22:26 ` Dave Chinner
2012-08-27 22:05 ` Naoya Horiguchi
2012-08-29 2:59 ` Dave Chinner
2012-08-29 5:32 ` Jun'ichi Nomura
2012-09-03 0:39 ` Dave Chinner
2012-08-22 20:22 ` [PATCH 0/3 v2] HWPOISON: improve dirty pagecache error reporting Andi Kleen
2012-08-22 21:14 ` Naoya Horiguchi
-- strict thread matches above, loose matches on Subject: below --
2012-08-10 21:41 [PATCH 0/3 v1] HWPOISON: improve dirty pagecache error handling Naoya Horiguchi
2012-08-10 21:41 ` [PATCH 1/3] HWPOISON: fix action_result() to print out dirty/clean Naoya Horiguchi
2012-08-10 23:08 ` Andi Kleen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120823093330.GC12745@localhost \
--to=fengguang.wu@intel.com \
--cc=akpm@linux-foundation.org \
--cc=andi.kleen@intel.com \
--cc=j-nomura@ce.jp.nec.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=n-horiguchi@ah.jp.nec.com \
--cc=riel@redhat.com \
--cc=tony.luck@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).