From: Nicholas Piggin <npiggin@gmail.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Oliver O'Halloran <oohall@gmail.com>,
Yumei Huang <yuhuang@redhat.com>, Michal Hocko <mhocko@suse.com>,
Xiao Guangrong <guangrong.xiao@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
KVM list <kvm@vger.kernel.org>, Linux MM <linux-mm@kvack.org>,
Gleb Natapov <gleb@kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
mtosatti@redhat.com,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Dave Hansen <dave.hansen@intel.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: DAX mapping detection (was: Re: [PATCH] Fix region lost in /proc/self/smaps)
Date: Mon, 12 Sep 2016 18:05:07 +1000 [thread overview]
Message-ID: <20160912180507.533b3549@roar.ozlabs.ibm.com> (raw)
In-Reply-To: <20160912075128.GB21474@infradead.org>
On Mon, 12 Sep 2016 00:51:28 -0700
Christoph Hellwig <hch@infradead.org> wrote:
> On Mon, Sep 12, 2016 at 05:25:15PM +1000, Oliver O'Halloran wrote:
> > What are the problems here? Is this a matter of existing filesystems
> > being unable/unwilling to support this or is it just fundamentally
> > broken?
>
> It's a fundamentally broken model. See Dave's post that actually was
> sent slightly earlier then mine for the list of required items, which
> is fairly unrealistic. You could probably try to architect a file
> system for it, but I doubt it would gain much traction.
It's not fundamentally broken, it just doesn't fit well existing
filesystems.
Dave's post of requirements is also wrong. A filesystem does not have
to guarantee all that, it only has to guarantee that is the case for
a given block after it has a mapping and page fault returns, other
operations can be supported by invalidating mappings, etc.
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next prev parent reply other threads:[~2016-09-12 8:05 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-08 4:32 DAX mapping detection (was: Re: [PATCH] Fix region lost in /proc/self/smaps) Dan Williams
2016-09-08 22:56 ` Ross Zwisler
2016-09-08 23:04 ` Dan Williams
2016-09-09 8:55 ` Xiao Guangrong
2016-09-09 15:40 ` Dan Williams
2016-09-12 6:00 ` Xiao Guangrong
2016-09-12 3:44 ` Rudoff, Andy
2016-09-12 6:31 ` Xiao Guangrong
2016-09-12 1:40 ` Dave Chinner
2016-09-15 5:55 ` Darrick J. Wong
2016-09-15 6:25 ` Dave Chinner
2016-09-12 5:27 ` Christoph Hellwig
2016-09-12 7:25 ` Oliver O'Halloran
2016-09-12 7:51 ` Christoph Hellwig
2016-09-12 8:05 ` Nicholas Piggin [this message]
2016-09-12 15:01 ` Christoph Hellwig
2016-09-13 1:31 ` Nicholas Piggin
2016-09-13 4:06 ` Dan Williams
2016-09-13 5:40 ` Nicholas Piggin
2016-09-12 21:34 ` Dave Chinner
2016-09-13 1:53 ` Nicholas Piggin
2016-09-13 7:17 ` Christoph Hellwig
2016-09-13 9:06 ` Nicholas Piggin
2016-09-14 7:39 ` Dave Chinner
2016-09-14 10:19 ` Nicholas Piggin
2016-09-15 2:31 ` Dave Chinner
2016-09-15 3:49 ` Nicholas Piggin
2016-09-15 10:32 ` Dave Chinner
2016-09-15 11:42 ` Nicholas Piggin
2016-09-15 22:33 ` Dave Chinner
2016-09-16 5:54 ` Nicholas Piggin
2016-12-19 21:11 ` Ross Zwisler
2016-12-20 1:09 ` Darrick J. Wong
2016-12-20 1:18 ` Dan Williams
2016-12-21 0:40 ` Darrick J. Wong
2016-12-21 16:53 ` Dan Williams
2016-12-21 21:24 ` Dave Chinner
2016-12-21 21:33 ` Dan Williams
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