From: Mel Gorman <mgorman@suse.de>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Christoph Hellwig <hch@infradead.org>,
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>,
Andrew Morton <akpm@linux-foundation.org>,
David Miller <davem@davemloft.net>,
Trond Myklebust <Trond.Myklebust@netapp.com>,
Neil Brown <neilb@suse.de>
Subject: Re: [PATCH 03/10] mm: Add support for a filesystem to control swap files
Date: Mon, 12 Sep 2011 10:34:34 +0100 [thread overview]
Message-ID: <20110912093058.GA3207@suse.de> (raw)
In-Reply-To: <1315818285.26517.18.camel@twins>
On Mon, Sep 12, 2011 at 11:04:45AM +0200, Peter Zijlstra wrote:
> On Fri, 2011-09-09 at 09:36 -0400, Christoph Hellwig wrote:
> > The equivalent of ->direct_IO should be used for both reads and writes.
>
> So the difference between DIO and swapIO is that swapIO needs the block
> map pinned in memory.. So at the very least you'll need those
> swap_{activate,deactivate} aops. The read/write-page thingies could
> indeed be shared with DIO.
>
I'm travelling at the moment so it'll be later in the week when I investigate
properly but I agree swap_[de|a]ctivate are still necessary. NFS does not
need to pin a block map but it's still necessary for calling xs_set_memalloc.
--
Mel Gorman
SUSE Labs
WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mgorman@suse.de>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Christoph Hellwig <hch@infradead.org>,
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>,
Andrew Morton <akpm@linux-foundation.org>,
David Miller <davem@davemloft.net>,
Trond Myklebust <Trond.Myklebust@netapp.com>,
Neil Brown <neilb@suse.de>
Subject: Re: [PATCH 03/10] mm: Add support for a filesystem to control swap files
Date: Mon, 12 Sep 2011 10:34:34 +0100 [thread overview]
Message-ID: <20110912093058.GA3207@suse.de> (raw)
In-Reply-To: <1315818285.26517.18.camel@twins>
On Mon, Sep 12, 2011 at 11:04:45AM +0200, Peter Zijlstra wrote:
> On Fri, 2011-09-09 at 09:36 -0400, Christoph Hellwig wrote:
> > The equivalent of ->direct_IO should be used for both reads and writes.
>
> So the difference between DIO and swapIO is that swapIO needs the block
> map pinned in memory.. So at the very least you'll need those
> swap_{activate,deactivate} aops. The read/write-page thingies could
> indeed be shared with DIO.
>
I'm travelling at the moment so it'll be later in the week when I investigate
properly but I agree swap_[de|a]ctivate are still necessary. NFS does not
need to pin a block map but it's still necessary for calling xs_set_memalloc.
--
Mel Gorman
SUSE Labs
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WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mgorman-l3A5Bk7waGM@public.gmane.org>
To: Peter Zijlstra <a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>
Cc: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
Linux-MM <linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>,
Linux-Netdev <netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linux-NFS <linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
Trond Myklebust
<Trond.Myklebust-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org>,
Neil Brown <neilb-l3A5Bk7waGM@public.gmane.org>
Subject: Re: [PATCH 03/10] mm: Add support for a filesystem to control swap files
Date: Mon, 12 Sep 2011 10:34:34 +0100 [thread overview]
Message-ID: <20110912093058.GA3207@suse.de> (raw)
In-Reply-To: <1315818285.26517.18.camel@twins>
On Mon, Sep 12, 2011 at 11:04:45AM +0200, Peter Zijlstra wrote:
> On Fri, 2011-09-09 at 09:36 -0400, Christoph Hellwig wrote:
> > The equivalent of ->direct_IO should be used for both reads and writes.
>
> So the difference between DIO and swapIO is that swapIO needs the block
> map pinned in memory.. So at the very least you'll need those
> swap_{activate,deactivate} aops. The read/write-page thingies could
> indeed be shared with DIO.
>
I'm travelling at the moment so it'll be later in the week when I investigate
properly but I agree swap_[de|a]ctivate are still necessary. NFS does not
need to pin a block map but it's still necessary for calling xs_set_memalloc.
--
Mel Gorman
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2011-09-12 9:34 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-09 11:00 [RFC PATCH 00/10] Swap-over-NFS without deadlocking v1 Mel Gorman
2011-09-09 11:00 ` Mel Gorman
2011-09-09 11:00 ` [PATCH 01/10] netvm: Prevent a stream-specific deadlock Mel Gorman
2011-09-09 11:00 ` Mel Gorman
2011-09-09 11:00 ` [PATCH 02/10] selinux: tag avc cache alloc as non-critical Mel Gorman
2011-09-09 11:00 ` Mel Gorman
2011-09-09 11:00 ` [PATCH 03/10] mm: Add support for a filesystem to control swap files Mel Gorman
2011-09-09 11:00 ` Mel Gorman
2011-09-09 13:00 ` Christoph Hellwig
2011-09-09 13:00 ` Christoph Hellwig
2011-09-09 13:00 ` Christoph Hellwig
2011-09-09 13:15 ` Mel Gorman
2011-09-09 13:15 ` Mel Gorman
2011-09-09 13:36 ` Christoph Hellwig
2011-09-09 13:36 ` Christoph Hellwig
2011-09-12 9:04 ` Peter Zijlstra
2011-09-12 9:04 ` Peter Zijlstra
2011-09-12 9:34 ` Mel Gorman [this message]
2011-09-12 9:34 ` Mel Gorman
2011-09-12 9:34 ` Mel Gorman
2011-09-12 9:56 ` Peter Zijlstra
2011-09-12 9:56 ` Peter Zijlstra
2011-09-12 11:56 ` Mel Gorman
2011-09-12 11:56 ` Mel Gorman
2011-09-12 12:06 ` Peter Zijlstra
2011-09-12 12:06 ` Peter Zijlstra
2011-09-09 11:00 ` [PATCH 04/10] mm: swap: Implement generic handlers for swap-related address ops Mel Gorman
2011-09-09 11:00 ` Mel Gorman
2011-09-09 11:00 ` [PATCH 05/10] mm: Methods for teaching filesystems about PG_swapcache pages Mel Gorman
2011-09-09 11:00 ` Mel Gorman
2011-09-09 11:00 ` [PATCH 06/10] nfs: teach the NFS client how to treat " Mel Gorman
2011-09-09 11:00 ` Mel Gorman
2011-09-09 11:00 ` [PATCH 07/10] nfs: disable data cache revalidation for swapfiles Mel Gorman
2011-09-09 11:00 ` Mel Gorman
2011-09-09 11:00 ` [PATCH 08/10] nfs: enable swap on NFS Mel Gorman
2011-09-09 11:00 ` Mel Gorman
2011-09-09 11:00 ` [PATCH 09/10] nfs: Prevent page allocator recursions with swap over NFS Mel Gorman
2011-09-09 11:00 ` Mel Gorman
2011-09-09 11:00 ` [PATCH 10/10] Avoid dereferencing bd_disk during swap_entry_free for network storage Mel Gorman
2011-09-09 11:00 ` Mel Gorman
2011-09-09 13:02 ` Christoph Hellwig
2011-09-09 13:02 ` Christoph Hellwig
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