From: Roman Kononov <kononov@ftml.net>
To: Nick Piggin <npiggin@suse.de>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org,
Roman Kononov <kernel@kononov.ftml.net>,
xfs@oss.sgi.com, Christoph Hellwig <hch@infradead.org>,
Linux Memory Management List <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Klotz <peter.klotz@aon.at>,
Linus Torvalds <torvalds@linux-foundation.org>,
stable@kernel.org
Subject: Re: [patch] mm: fix lockless pagecache reordering bug (was Re: BUG: soft lockup - is this XFS problem?)
Date: Tue, 06 Jan 2009 10:16:32 -0600 [thread overview]
Message-ID: <496383E0.50102@ftml.net> (raw)
In-Reply-To: <20090106020550.GA819@wotan.suse.de>
On 2009-01-05 20:05 Nick Piggin said the following:
> Subject: mm lockless pagecache barrier fix
> static inline void *radix_tree_deref_slot(void **pslot)
> {
> - void *ret = *pslot;
> + void *ret = rcu_dereference(*pslot);
> if (unlikely(radix_tree_is_indirect_ptr(ret)))
> ret = RADIX_TREE_RETRY;
> return ret;
3 systems are working fine for a few hours with the patch. They would
fail within 20 minutes without it.
Thanks.
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
WARNING: multiple messages have this Message-ID (diff)
From: Roman Kononov <kononov@ftml.net>
To: Nick Piggin <npiggin@suse.de>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Peter Klotz <peter.klotz@aon.at>,
stable@kernel.org,
Linux Memory Management List <linux-mm@kvack.org>,
Christoph Hellwig <hch@infradead.org>,
Roman Kononov <kernel@kononov.ftml.net>,
linux-kernel@vger.kernel.org, xfs@oss.sgi.com,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [patch] mm: fix lockless pagecache reordering bug (was Re: BUG: soft lockup - is this XFS problem?)
Date: Tue, 06 Jan 2009 10:16:32 -0600 [thread overview]
Message-ID: <496383E0.50102@ftml.net> (raw)
In-Reply-To: <20090106020550.GA819@wotan.suse.de>
On 2009-01-05 20:05 Nick Piggin said the following:
> Subject: mm lockless pagecache barrier fix
> static inline void *radix_tree_deref_slot(void **pslot)
> {
> - void *ret = *pslot;
> + void *ret = rcu_dereference(*pslot);
> if (unlikely(radix_tree_is_indirect_ptr(ret)))
> ret = RADIX_TREE_RETRY;
> return ret;
3 systems are working fine for a few hours with the patch. They would
fail within 20 minutes without it.
Thanks.
WARNING: multiple messages have this Message-ID (diff)
From: Roman Kononov <kononov@ftml.net>
To: Nick Piggin <npiggin@suse.de>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Peter Klotz <peter.klotz@aon.at>,
stable@kernel.org,
Linux Memory Management List <linux-mm@kvack.org>,
Christoph Hellwig <hch@infradead.org>,
Roman Kononov <kernel@kononov.ftml.net>,
linux-kernel@vger.kernel.org, xfs@oss.sgi.com,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [patch] mm: fix lockless pagecache reordering bug (was Re: BUG: soft lockup - is this XFS problem?)
Date: Tue, 06 Jan 2009 10:16:32 -0600 [thread overview]
Message-ID: <496383E0.50102@ftml.net> (raw)
In-Reply-To: <20090106020550.GA819@wotan.suse.de>
On 2009-01-05 20:05 Nick Piggin said the following:
> Subject: mm lockless pagecache barrier fix
> static inline void *radix_tree_deref_slot(void **pslot)
> {
> - void *ret = *pslot;
> + void *ret = rcu_dereference(*pslot);
> if (unlikely(radix_tree_is_indirect_ptr(ret)))
> ret = RADIX_TREE_RETRY;
> return ret;
3 systems are working fine for a few hours with the patch. They would
fail within 20 minutes without it.
Thanks.
--
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next prev parent reply other threads:[~2009-01-06 16:16 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-19 6:59 BUG: soft lockup - is this XFS problem? Roman Kononov
2008-12-23 17:12 ` Christoph Hellwig
2008-12-23 17:12 ` Christoph Hellwig
2008-12-30 4:23 ` Nick Piggin
2008-12-30 4:23 ` Nick Piggin
2009-01-03 21:44 ` Christoph Hellwig
2009-01-03 21:44 ` Christoph Hellwig
2009-01-05 1:48 ` Nick Piggin
2009-01-05 1:48 ` Nick Piggin
2009-01-05 4:19 ` Nick Piggin
2009-01-05 4:19 ` Nick Piggin
2009-01-05 6:48 ` Nick Piggin
2009-01-05 6:48 ` Nick Piggin
2009-01-05 14:25 ` Roman Kononov
2009-01-05 14:25 ` Roman Kononov
2009-01-05 16:21 ` Peter Klotz
2009-01-05 16:21 ` Peter Klotz
2009-01-05 16:41 ` [patch] mm: fix lockless pagecache reordering bug (was Re: BUG: soft lockup - is this XFS problem?) Nick Piggin
2009-01-05 16:41 ` Nick Piggin
2009-01-05 16:41 ` Nick Piggin
2009-01-05 17:30 ` Linus Torvalds
2009-01-05 17:30 ` Linus Torvalds
2009-01-05 17:30 ` Linus Torvalds
2009-01-05 18:00 ` Nick Piggin
2009-01-05 18:00 ` Nick Piggin
2009-01-05 18:00 ` Nick Piggin
2009-01-05 18:44 ` Linus Torvalds
2009-01-05 18:44 ` Linus Torvalds
2009-01-05 18:44 ` Linus Torvalds
2009-01-05 19:39 ` Linus Torvalds
2009-01-05 19:39 ` Linus Torvalds
2009-01-05 19:39 ` Linus Torvalds
2009-01-06 17:17 ` Paul E. McKenney
2009-01-06 17:17 ` Paul E. McKenney
2009-01-06 17:17 ` Paul E. McKenney
2009-01-05 20:12 ` Paul E. McKenney
2009-01-05 20:12 ` Paul E. McKenney
2009-01-05 20:12 ` Paul E. McKenney
2009-01-05 20:39 ` Linus Torvalds
2009-01-05 20:39 ` Linus Torvalds
2009-01-05 20:39 ` Linus Torvalds
2009-01-05 21:57 ` Paul E. McKenney
2009-01-05 21:57 ` Paul E. McKenney
2009-01-05 21:57 ` Paul E. McKenney
2009-01-06 2:05 ` Nick Piggin
2009-01-06 2:05 ` Nick Piggin
2009-01-06 2:05 ` Nick Piggin
2009-01-06 2:23 ` Paul E. McKenney
2009-01-06 2:23 ` Paul E. McKenney
2009-01-06 2:23 ` Paul E. McKenney
2009-01-06 2:29 ` Linus Torvalds
2009-01-06 2:29 ` Linus Torvalds
2009-01-06 2:29 ` Linus Torvalds
2009-01-06 8:38 ` Peter Klotz
2009-01-06 8:38 ` Peter Klotz
2009-01-06 8:38 ` Peter Klotz
2009-01-06 8:43 ` Nick Piggin
2009-01-06 8:43 ` Nick Piggin
2009-01-06 8:43 ` Nick Piggin
2009-01-06 16:16 ` Roman Kononov [this message]
2009-01-06 16:16 ` Roman Kononov
2009-01-06 16:16 ` Roman Kononov
2009-01-05 21:04 ` [patch] mm: fix lockless pagecache reordering bug (was Peter Zijlstra
2009-01-05 21:04 ` Peter Zijlstra
2009-01-05 21:04 ` Peter Zijlstra
2009-01-05 21:58 ` Paul E. McKenney
2009-01-05 21:58 ` Paul E. McKenney
2009-01-05 21:58 ` Paul E. McKenney
2011-07-14 11:23 ` BUG: soft lockup - is this XFS problem? Guus Sliepen
2011-07-14 11:23 ` Guus Sliepen
2011-07-14 18:03 ` Peter Klotz
2011-07-14 18:03 ` Peter Klotz
2011-07-14 19:29 ` Guus Sliepen
2011-07-14 19:29 ` Guus Sliepen
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