From: Minchan Kim <minchan.kim@gmail.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>, Mel Gorman <mel@csn.ul.ie>,
akpm@linux-foundation.org, Ury Stankevich <urykhy@gmail.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
stable@kernel.org
Subject: Re: [PATCH] mm: compaction: Abort compaction if too many pages are isolated and caller is asynchronous
Date: Tue, 31 May 2011 22:33:40 +0900 [thread overview]
Message-ID: <20110531133340.GB3490@barrios-laptop> (raw)
In-Reply-To: <20110531122437.GJ19505@random.random>
On Tue, May 31, 2011 at 02:24:37PM +0200, Andrea Arcangeli wrote:
> On Tue, May 31, 2011 at 09:16:20PM +0900, Minchan Kim wrote:
> > I am not sure this is related to the problem you have seen.
> > If he used hwpoison by madivse, it is possible.
>
> CONFIG_ARCH_SUPPORTS_MEMORY_FAILURE=y
> # CONFIG_MEMORY_FAILURE is not set
>
> > Anyway, we can see negative value by count mismatch in UP build.
> > Let's fix it.
>
> Definitely let's fix it, but it's probably not related to this one.
>
> >
> > From 1d3ebce2e8aa79dcc912da16b7a8d0611b6f9f1a Mon Sep 17 00:00:00 2001
> > From: Minchan Kim <minchan.kim@gmail.com>
> > Date: Tue, 31 May 2011 21:11:58 +0900
> > Subject: [PATCH] Fix page isolated count mismatch
> >
> > If migration is failed, normally we call putback_lru_pages which
> > decreases NR_ISOLATE_[ANON|FILE].
> > It means we should increase NR_ISOLATE_[ANON|FILE] before calling
> > putback_lru_pages. But soft_offline_page dosn't it.
> >
> > It can make NR_ISOLATE_[ANON|FILE] with negative value and in UP build,
> > zone_page_state will say huge isolated pages so too_many_isolated
> > functions be deceived completely. At last, some process stuck in D state
> > as it expect while loop ending with congestion_wait.
> > But it's never ending story.
> >
> > If it is right, it would be -stable stuff.
> >
> > Cc: Mel Gorman <mel@csn.ul.ie>
> > Cc: Andrea Arcangeli <aarcange@redhat.com>
> > Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
> > ---
> > mm/memory-failure.c | 4 +++-
> > 1 files changed, 3 insertions(+), 1 deletions(-)
> >
> > diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> > index 5c8f7e0..eac0ba5 100644
> > --- a/mm/memory-failure.c
> > +++ b/mm/memory-failure.c
> > @@ -52,6 +52,7 @@
> > #include <linux/swapops.h>
> > #include <linux/hugetlb.h>
> > #include <linux/memory_hotplug.h>
> > +#include <linux/mm_inline.h>
> > #include "internal.h"
> >
> > int sysctl_memory_failure_early_kill __read_mostly = 0;
> > @@ -1468,7 +1469,8 @@ int soft_offline_page(struct page *page, int flags)
> > put_page(page);
> > if (!ret) {
> > LIST_HEAD(pagelist);
> > -
> > + inc_zone_page_state(page, NR_ISOLATED_ANON +
> > + page_is_file_cache(page));
> > list_add(&page->lru, &pagelist);
> > ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL,
> > 0, true);
>
> Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Thanks, Andrea.
>
> Let's check all other migrate_pages callers too...
I checked them before sending patch but I got failed to find strange things. :(
Now I am checking the page's SwapBacked flag can be changed
between before and after of migrate_pages so accounting of NR_ISOLATED_XX can
make mistake. I am approaching the failure, too. Hmm.
--
Kind regards
Minchan Kim
next prev parent reply other threads:[~2011-05-31 13:33 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-30 13:13 [PATCH] mm: compaction: Abort compaction if too many pages are isolated and caller is asynchronous Mel Gorman
2011-05-30 14:31 ` Andrea Arcangeli
2011-05-30 15:37 ` Mel Gorman
2011-05-30 16:55 ` Mel Gorman
2011-05-30 17:53 ` Andrea Arcangeli
2011-05-31 12:16 ` Minchan Kim
2011-05-31 12:24 ` Andrea Arcangeli
2011-05-31 13:33 ` Minchan Kim [this message]
2011-05-31 14:14 ` Andrea Arcangeli
2011-05-31 14:37 ` Minchan Kim
2011-05-31 14:38 ` Minchan Kim
2011-06-02 18:23 ` Andrea Arcangeli
2011-06-02 20:21 ` Minchan Kim
2011-06-02 20:59 ` Minchan Kim
2011-06-02 22:03 ` Andrea Arcangeli
2011-06-02 21:40 ` Andrea Arcangeli
2011-06-02 22:23 ` Minchan Kim
2011-06-02 22:32 ` Andrea Arcangeli
2011-06-02 23:01 ` Minchan Kim
2011-06-03 17:37 ` Andrea Arcangeli
2011-06-03 18:07 ` Andrea Arcangeli
2011-06-04 7:59 ` Minchan Kim
2011-06-06 10:32 ` Mel Gorman
2011-06-06 12:49 ` Andrea Arcangeli
2011-06-06 14:47 ` Mel Gorman
2011-06-06 14:07 ` Minchan Kim
2011-06-06 10:15 ` Mel Gorman
2011-06-06 10:26 ` Mel Gorman
2011-06-06 14:01 ` Minchan Kim
2011-06-06 14:26 ` Minchan Kim
2011-06-02 23:02 ` Minchan Kim
2011-06-01 0:57 ` Mel Gorman
2011-06-01 9:24 ` Mel Gorman
2011-06-01 17:58 ` Mel Gorman
2011-06-01 19:15 ` Andrea Arcangeli
2011-06-01 21:40 ` Mel Gorman
2011-06-01 23:30 ` Andrea Arcangeli
2011-06-02 1:03 ` Mel Gorman
2011-06-02 8:34 ` Minchan Kim
2011-06-02 13:29 ` Andrea Arcangeli
2011-06-02 14:50 ` Mel Gorman
2011-06-02 15:37 ` Andrea Arcangeli
2011-06-03 2:09 ` Mel Gorman
2011-06-03 14:49 ` Mel Gorman
2011-06-03 15:45 ` Andrea Arcangeli
2011-06-04 7:25 ` Minchan Kim
2011-06-06 10:39 ` Mel Gorman
2011-06-06 12:38 ` Andrea Arcangeli
2011-06-06 14:55 ` Mel Gorman
2011-06-06 14:19 ` Minchan Kim
2011-06-06 22:32 ` Andrew Morton
2011-06-04 6:58 ` Minchan Kim
2011-06-06 10:43 ` Mel Gorman
2011-06-06 12:40 ` Andrea Arcangeli
2011-06-06 13:27 ` Minchan Kim
2011-06-06 13:23 ` Minchan Kim
2011-05-31 14:34 ` Mel Gorman
2011-05-30 14:45 ` [stable] " Greg KH
2011-05-30 16:14 ` Minchan Kim
2011-05-31 8:32 ` Mel Gorman
2011-05-31 4:48 ` KAMEZAWA Hiroyuki
2011-05-31 5:38 ` Minchan Kim
2011-05-31 7:14 ` KOSAKI Motohiro
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