From: Mel Gorman <mgorman@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Linux-MM <linux-mm@kvack.org>,
Linux-Netdev <netdev@vger.kernel.org>,
Linux-NFS <linux-nfs@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
David Miller <davem@davemloft.net>,
Trond Myklebust <Trond.Myklebust@netapp.com>,
Neil Brown <neilb@suse.de>, Christoph Hellwig <hch@infradead.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Mike Christie <michaelc@cs.wisc.edu>,
Eric B Munson <emunson@mgebm.net>
Subject: Re: [PATCH 01/12] netvm: Prevent a stream-specific deadlock
Date: Wed, 20 Jun 2012 15:21:27 +0100 [thread overview]
Message-ID: <20120620142127.GK4011@suse.de> (raw)
In-Reply-To: <1340185081-22525-2-git-send-email-mgorman@suse.de>
On Wed, Jun 20, 2012 at 10:37:50AM +0100, Mel Gorman wrote:
> It could happen that all !SOCK_MEMALLOC sockets have buffered so
> much data that we're over the global rmem limit. This will prevent
> SOCK_MEMALLOC buffers from receiving data, which will prevent userspace
> from running, which is needed to reduce the buffered data.
>
> Fix this by exempting the SOCK_MEMALLOC sockets from the rmem limit.
> Once this change it applied, it is important that sockets that set
> SOCK_MEMALLOC do not clear the flag until the socket is being torn down.
> If this happens, a warning is generated and the tokens reclaimed to
> avoid accounting errors until the bug is fixed.
>
> [davem@davemloft.net: Warning about clearing SOCK_MEMALLOC]
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Signed-off-by: Mel Gorman <mgorman@suse.de>
> Acked-by: David S. Miller <davem@davemloft.net>
This patch introduced a new warning that I had previously missed. I'll
fix it up when rebasing this series on top of linux-next.
--
Mel Gorman
SUSE Labs
WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mgorman@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Linux-MM <linux-mm@kvack.org>,
Linux-Netdev <netdev@vger.kernel.org>,
Linux-NFS <linux-nfs@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
David Miller <davem@davemloft.net>,
Trond Myklebust <Trond.Myklebust@netapp.com>,
Neil Brown <neilb@suse.de>, Christoph Hellwig <hch@infradead.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Mike Christie <michaelc@cs.wisc.edu>,
Eric B Munson <emunson@mgebm.net>
Subject: Re: [PATCH 01/12] netvm: Prevent a stream-specific deadlock
Date: Wed, 20 Jun 2012 15:21:27 +0100 [thread overview]
Message-ID: <20120620142127.GK4011@suse.de> (raw)
In-Reply-To: <1340185081-22525-2-git-send-email-mgorman@suse.de>
On Wed, Jun 20, 2012 at 10:37:50AM +0100, Mel Gorman wrote:
> It could happen that all !SOCK_MEMALLOC sockets have buffered so
> much data that we're over the global rmem limit. This will prevent
> SOCK_MEMALLOC buffers from receiving data, which will prevent userspace
> from running, which is needed to reduce the buffered data.
>
> Fix this by exempting the SOCK_MEMALLOC sockets from the rmem limit.
> Once this change it applied, it is important that sockets that set
> SOCK_MEMALLOC do not clear the flag until the socket is being torn down.
> If this happens, a warning is generated and the tokens reclaimed to
> avoid accounting errors until the bug is fixed.
>
> [davem@davemloft.net: Warning about clearing SOCK_MEMALLOC]
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Signed-off-by: Mel Gorman <mgorman@suse.de>
> Acked-by: David S. Miller <davem@davemloft.net>
This patch introduced a new warning that I had previously missed. I'll
fix it up when rebasing this series on top of linux-next.
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2012-06-20 14:21 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-20 9:37 [PATCH 00/12] Swap-over-NFS without deadlocking V6 Mel Gorman
2012-06-20 9:37 ` Mel Gorman
2012-06-20 9:37 ` [PATCH 01/12] netvm: Prevent a stream-specific deadlock Mel Gorman
2012-06-20 9:37 ` Mel Gorman
2012-06-20 14:21 ` Mel Gorman [this message]
2012-06-20 14:21 ` Mel Gorman
2012-06-20 15:22 ` Rik van Riel
2012-06-20 15:22 ` Rik van Riel
2012-06-20 9:37 ` [PATCH 02/12] selinux: tag avc cache alloc as non-critical Mel Gorman
2012-06-20 9:37 ` Mel Gorman
2012-06-20 15:33 ` Rik van Riel
2012-06-20 15:33 ` Rik van Riel
2012-06-20 9:37 ` [PATCH 03/12] mm: Methods for teaching filesystems about PG_swapcache pages Mel Gorman
2012-06-20 9:37 ` Mel Gorman
2012-06-20 15:49 ` Rik van Riel
2012-06-20 15:49 ` Rik van Riel
2012-06-20 9:37 ` [PATCH 04/12] mm: Add support for a filesystem to activate swap files and use direct_IO for writing swap pages Mel Gorman
2012-06-20 9:37 ` Mel Gorman
2012-06-20 16:08 ` Rik van Riel
2012-06-20 16:08 ` Rik van Riel
2012-06-20 9:37 ` [PATCH 05/12] mm: swap: Implement generic handler for swap_activate Mel Gorman
2012-06-20 9:37 ` Mel Gorman
2012-06-20 16:09 ` Rik van Riel
2012-06-20 16:09 ` Rik van Riel
2012-06-20 9:37 ` [PATCH 06/12] mm: Add get_kernel_page[s] for pinning of kernel addresses for I/O Mel Gorman
2012-06-20 9:37 ` Mel Gorman
2012-06-20 16:11 ` Rik van Riel
2012-06-20 16:11 ` Rik van Riel
2012-06-20 9:37 ` [PATCH 07/12] mm: Add support for direct_IO to highmem pages Mel Gorman
2012-06-20 9:37 ` Mel Gorman
2012-06-20 17:08 ` Rik van Riel
2012-06-20 17:08 ` Rik van Riel
2012-06-20 9:37 ` [PATCH 08/12] nfs: teach the NFS client how to treat PG_swapcache pages Mel Gorman
2012-06-20 9:37 ` Mel Gorman
2012-06-20 17:14 ` Rik van Riel
2012-06-20 17:14 ` Rik van Riel
2012-06-20 9:37 ` [PATCH 09/12] nfs: disable data cache revalidation for swapfiles Mel Gorman
2012-06-20 9:37 ` Mel Gorman
2012-06-20 17:16 ` Rik van Riel
2012-06-20 17:16 ` Rik van Riel
2012-06-20 9:37 ` [PATCH 10/12] nfs: enable swap on NFS Mel Gorman
2012-06-20 9:37 ` Mel Gorman
2012-06-20 17:38 ` Rik van Riel
2012-06-20 17:38 ` Rik van Riel
2012-06-20 9:38 ` [PATCH 11/12] nfs: Prevent page allocator recursions with swap over NFS Mel Gorman
2012-06-20 9:38 ` Mel Gorman
2012-06-20 17:42 ` Rik van Riel
2012-06-20 17:42 ` Rik van Riel
2012-06-20 9:38 ` [PATCH 12/12] Avoid dereferencing bd_disk during swap_entry_free for network storage Mel Gorman
2012-06-20 9:38 ` Mel Gorman
2012-06-20 17:47 ` Rik van Riel
2012-06-20 17:47 ` Rik van Riel
-- strict thread matches above, loose matches on Subject: below --
2012-07-12 6:40 [PATCH 00/12] Swap-over-NFS without deadlocking V9 Mel Gorman
2012-07-12 6:40 ` [PATCH 01/12] netvm: Prevent a stream-specific deadlock Mel Gorman
2012-07-12 6:40 ` Mel Gorman
2012-06-29 13:33 [PATCH 00/12] Swap-over-NFS without deadlocking V8 Mel Gorman
2012-06-29 13:33 ` [PATCH 01/12] netvm: Prevent a stream-specific deadlock Mel Gorman
2012-06-29 13:33 ` Mel Gorman
2012-06-22 14:30 [PATCH 00/12] Swap-over-NFS without deadlocking V7 Mel Gorman
2012-06-22 14:30 ` [PATCH 01/12] netvm: Prevent a stream-specific deadlock Mel Gorman
2012-06-22 14:30 ` Mel Gorman
2012-05-17 14:51 [PATCH 00/12] Swap-over-NFS without deadlocking V5 Mel Gorman
2012-05-17 14:51 ` [PATCH 01/12] netvm: Prevent a stream-specific deadlock Mel Gorman
2012-05-17 14:51 ` Mel Gorman
2012-05-17 20:14 ` David Miller
2012-05-17 20:14 ` David Miller
2012-05-10 13:54 [PATCH 00/12] Swap-over-NFS without deadlocking V4 Mel Gorman
2012-05-10 13:54 ` [PATCH 01/12] netvm: Prevent a stream-specific deadlock Mel Gorman
2012-05-10 13:54 ` Mel Gorman
2012-05-11 5:10 ` David Miller
2012-05-11 5:10 ` David Miller
2012-05-14 10:56 ` Mel Gorman
2012-05-14 10:56 ` Mel Gorman
2012-05-14 20:26 ` David Miller
2012-05-14 20:26 ` David Miller
2012-05-15 9:14 ` Mel Gorman
2012-05-15 9:14 ` Mel Gorman
2012-05-15 9:14 ` Mel Gorman
2012-05-15 9:47 ` Peter Zijlstra
2012-05-15 9:47 ` Peter Zijlstra
2012-05-15 10:08 ` Mel Gorman
2012-05-15 10:08 ` Mel Gorman
2012-05-15 10:08 ` Mel Gorman
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