From: Christoph Hellwig <hch@infradead.org>
To: Ross Zwisler <ross.zwisler@linux.intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Xiao Guangrong <guangrong.xiao@linux.intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.com>, Gleb Natapov <gleb@kernel.org>,
mtosatti@redhat.com, KVM list <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Stefan Hajnoczi <stefanha@redhat.com>,
Yumei Huang <yuhuang@redhat.com>, Linux MM <linux-mm@kvack.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: DAX mapping detection (was: Re: [PATCH] Fix region lost in /proc/self/smaps)
Date: Sun, 11 Sep 2016 22:27:03 -0700 [thread overview]
Message-ID: <20160912052703.GA1897@infradead.org> (raw)
In-Reply-To: <20160908225636.GB15167@linux.intel.com>
On Thu, Sep 08, 2016 at 04:56:36PM -0600, Ross Zwisler wrote:
> I think this goes back to our previous discussion about support for the PMEM
> programming model. Really I think what NVML needs isn't a way to tell if it
> is getting a DAX mapping, but whether it is getting a DAX mapping on a
> filesystem that fully supports the PMEM programming model. This of course is
> defined to be a filesystem where it can do all of its flushes from userspace
> safely and never call fsync/msync, and that allocations that happen in page
> faults will be synchronized to media before the page fault completes.
That's a an easy way to flag: you will never get that from a Linux
filesystem, period.
NVML folks really need to stop taking crack and dreaming this could
happen.
_______________________________________________
Linux-nvdimm mailing list
Linux-nvdimm@lists.01.org
https://lists.01.org/mailman/listinfo/linux-nvdimm
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: Ross Zwisler
<ross.zwisler-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
Dan Williams
<dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Xiao Guangrong
<guangrong.xiao-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
Dave Hansen <dave.hansen-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Paolo Bonzini <pbonzini-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Michal Hocko <mhocko-IBi9RG/b67k@public.gmane.org>,
Gleb Natapov <gleb-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
mtosatti-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
KVM list <kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Stefan Hajnoczi
<stefanha-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Yumei Huang <yuhuang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Linux MM <linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>,
"linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org"
<linux-nvdimm-y27Ovi1pjclAfugRpC6u6w@public.gmane.org>,
linux-fsdevel
<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: DAX mapping detection (was: Re: [PATCH] Fix region lost in /proc/self/smaps)
Date: Sun, 11 Sep 2016 22:27:03 -0700 [thread overview]
Message-ID: <20160912052703.GA1897@infradead.org> (raw)
In-Reply-To: <20160908225636.GB15167-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
On Thu, Sep 08, 2016 at 04:56:36PM -0600, Ross Zwisler wrote:
> I think this goes back to our previous discussion about support for the PMEM
> programming model. Really I think what NVML needs isn't a way to tell if it
> is getting a DAX mapping, but whether it is getting a DAX mapping on a
> filesystem that fully supports the PMEM programming model. This of course is
> defined to be a filesystem where it can do all of its flushes from userspace
> safely and never call fsync/msync, and that allocations that happen in page
> faults will be synchronized to media before the page fault completes.
That's a an easy way to flag: you will never get that from a Linux
filesystem, period.
NVML folks really need to stop taking crack and dreaming this could
happen.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Ross Zwisler <ross.zwisler@linux.intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Xiao Guangrong <guangrong.xiao@linux.intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.com>, Gleb Natapov <gleb@kernel.org>,
mtosatti@redhat.com, KVM list <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Stefan Hajnoczi <stefanha@redhat.com>,
Yumei Huang <yuhuang@redhat.com>, Linux MM <linux-mm@kvack.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: DAX mapping detection (was: Re: [PATCH] Fix region lost in /proc/self/smaps)
Date: Sun, 11 Sep 2016 22:27:03 -0700 [thread overview]
Message-ID: <20160912052703.GA1897@infradead.org> (raw)
In-Reply-To: <20160908225636.GB15167@linux.intel.com>
On Thu, Sep 08, 2016 at 04:56:36PM -0600, Ross Zwisler wrote:
> I think this goes back to our previous discussion about support for the PMEM
> programming model. Really I think what NVML needs isn't a way to tell if it
> is getting a DAX mapping, but whether it is getting a DAX mapping on a
> filesystem that fully supports the PMEM programming model. This of course is
> defined to be a filesystem where it can do all of its flushes from userspace
> safely and never call fsync/msync, and that allocations that happen in page
> faults will be synchronized to media before the page fault completes.
That's a an easy way to flag: you will never get that from a Linux
filesystem, period.
NVML folks really need to stop taking crack and dreaming this could
happen.
--
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see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Ross Zwisler <ross.zwisler@linux.intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Xiao Guangrong <guangrong.xiao@linux.intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.com>, Gleb Natapov <gleb@kernel.org>,
mtosatti@redhat.com, KVM list <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Stefan Hajnoczi <stefanha@redhat.com>,
Yumei Huang <yuhuang@redhat.com>, Linux MM <linux-mm@kvack.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: DAX mapping detection (was: Re: [PATCH] Fix region lost in /proc/self/smaps)
Date: Sun, 11 Sep 2016 22:27:03 -0700 [thread overview]
Message-ID: <20160912052703.GA1897@infradead.org> (raw)
In-Reply-To: <20160908225636.GB15167@linux.intel.com>
On Thu, Sep 08, 2016 at 04:56:36PM -0600, Ross Zwisler wrote:
> I think this goes back to our previous discussion about support for the PMEM
> programming model. Really I think what NVML needs isn't a way to tell if it
> is getting a DAX mapping, but whether it is getting a DAX mapping on a
> filesystem that fully supports the PMEM programming model. This of course is
> defined to be a filesystem where it can do all of its flushes from userspace
> safely and never call fsync/msync, and that allocations that happen in page
> faults will be synchronized to media before the page fault completes.
That's a an easy way to flag: you will never get that from a Linux
filesystem, period.
NVML folks really need to stop taking crack and dreaming this could
happen.
next prev parent reply other threads:[~2016-09-12 5:27 UTC|newest]
Thread overview: 133+ 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 4:32 ` Dan Williams
2016-09-08 4:32 ` Dan Williams
2016-09-08 22:56 ` Ross Zwisler
2016-09-08 22:56 ` Ross Zwisler
2016-09-08 22:56 ` Ross Zwisler
2016-09-08 22:56 ` Ross Zwisler
2016-09-08 23:04 ` Dan Williams
2016-09-08 23:04 ` Dan Williams
2016-09-08 23:04 ` Dan Williams
2016-09-09 8:55 ` Xiao Guangrong
2016-09-09 8:55 ` Xiao Guangrong
2016-09-09 8:55 ` Xiao Guangrong
2016-09-09 15:40 ` Dan Williams
2016-09-09 15:40 ` Dan Williams
2016-09-09 15:40 ` Dan Williams
2016-09-12 6:00 ` Xiao Guangrong
2016-09-12 6:00 ` Xiao Guangrong
2016-09-12 6:00 ` Xiao Guangrong
2016-09-12 6:00 ` Xiao Guangrong
2016-09-12 3:44 ` Rudoff, Andy
2016-09-12 3:44 ` Rudoff, Andy
2016-09-12 3:44 ` Rudoff, Andy
2016-09-12 6:31 ` Xiao Guangrong
2016-09-12 6:31 ` Xiao Guangrong
2016-09-12 6:31 ` Xiao Guangrong
2016-09-12 1:40 ` Dave Chinner
2016-09-12 1:40 ` Dave Chinner
2016-09-12 1:40 ` Dave Chinner
2016-09-12 1:40 ` Dave Chinner
2016-09-15 5:55 ` Darrick J. Wong
2016-09-15 5:55 ` Darrick J. Wong
2016-09-15 5:55 ` Darrick J. Wong
2016-09-15 6:25 ` Dave Chinner
2016-09-15 6:25 ` Dave Chinner
2016-09-15 6:25 ` Dave Chinner
2016-09-12 5:27 ` Christoph Hellwig [this message]
2016-09-12 5:27 ` Christoph Hellwig
2016-09-12 5:27 ` Christoph Hellwig
2016-09-12 5:27 ` Christoph Hellwig
2016-09-12 7:25 ` Oliver O'Halloran
2016-09-12 7:25 ` Oliver O'Halloran
2016-09-12 7:25 ` Oliver O'Halloran
2016-09-12 7:51 ` Christoph Hellwig
2016-09-12 7:51 ` Christoph Hellwig
2016-09-12 8:05 ` Nicholas Piggin
2016-09-12 8:05 ` Nicholas Piggin
2016-09-12 8:05 ` Nicholas Piggin
2016-09-12 15:01 ` Christoph Hellwig
2016-09-12 15:01 ` Christoph Hellwig
2016-09-12 15:01 ` Christoph Hellwig
2016-09-12 15:01 ` Christoph Hellwig
2016-09-13 1:31 ` Nicholas Piggin
2016-09-13 1:31 ` Nicholas Piggin
2016-09-13 1:31 ` Nicholas Piggin
2016-09-13 1:31 ` Nicholas Piggin
2016-09-13 4:06 ` Dan Williams
2016-09-13 4:06 ` Dan Williams
2016-09-13 4:06 ` Dan Williams
2016-09-13 5:40 ` Nicholas Piggin
2016-09-13 5:40 ` Nicholas Piggin
2016-09-13 5:40 ` Nicholas Piggin
2016-09-12 21:34 ` Dave Chinner
2016-09-12 21:34 ` Dave Chinner
2016-09-12 21:34 ` Dave Chinner
2016-09-13 1:53 ` Nicholas Piggin
2016-09-13 1:53 ` Nicholas Piggin
2016-09-13 1:53 ` Nicholas Piggin
2016-09-13 1:53 ` Nicholas Piggin
2016-09-13 7:17 ` Christoph Hellwig
2016-09-13 7:17 ` Christoph Hellwig
2016-09-13 7:17 ` Christoph Hellwig
2016-09-13 9:06 ` Nicholas Piggin
2016-09-13 9:06 ` Nicholas Piggin
2016-09-13 9:06 ` Nicholas Piggin
2016-09-13 9:06 ` Nicholas Piggin
2016-09-14 7:39 ` Dave Chinner
2016-09-14 7:39 ` Dave Chinner
2016-09-14 7:39 ` Dave Chinner
2016-09-14 7:39 ` Dave Chinner
2016-09-14 10:19 ` Nicholas Piggin
2016-09-14 10:19 ` Nicholas Piggin
2016-09-14 10:19 ` Nicholas Piggin
2016-09-14 10:19 ` Nicholas Piggin
2016-09-15 2:31 ` Dave Chinner
2016-09-15 2:31 ` Dave Chinner
2016-09-15 2:31 ` Dave Chinner
2016-09-15 2:31 ` Dave Chinner
2016-09-15 3:49 ` Nicholas Piggin
2016-09-15 3:49 ` Nicholas Piggin
2016-09-15 3:49 ` Nicholas Piggin
2016-09-15 3:49 ` Nicholas Piggin
2016-09-15 10:32 ` Dave Chinner
2016-09-15 10:32 ` Dave Chinner
2016-09-15 10:32 ` Dave Chinner
2016-09-15 10:32 ` Dave Chinner
2016-09-15 11:42 ` Nicholas Piggin
2016-09-15 11:42 ` Nicholas Piggin
2016-09-15 11:42 ` Nicholas Piggin
2016-09-15 11:42 ` Nicholas Piggin
2016-09-15 22:33 ` Dave Chinner
2016-09-15 22:33 ` Dave Chinner
2016-09-15 22:33 ` Dave Chinner
2016-09-15 22:33 ` Dave Chinner
2016-09-16 5:54 ` Nicholas Piggin
2016-09-16 5:54 ` Nicholas Piggin
2016-09-16 5:54 ` Nicholas Piggin
2016-09-16 5:54 ` Nicholas Piggin
2016-12-19 21:11 ` Ross Zwisler
2016-12-19 21:11 ` Ross Zwisler
2016-12-19 21:11 ` Ross Zwisler
2016-12-19 21:11 ` Ross Zwisler
2016-12-19 21:11 ` Ross Zwisler
2016-12-20 1:09 ` Darrick J. Wong
2016-12-20 1:09 ` Darrick J. Wong
2016-12-20 1:09 ` Darrick J. Wong
2016-12-20 1:18 ` Dan Williams
2016-12-20 1:18 ` Dan Williams
2016-12-21 0:40 ` Darrick J. Wong
2016-12-21 0:40 ` Darrick J. Wong
2016-12-21 0:40 ` Darrick J. Wong
2016-12-21 0:40 ` Darrick J. Wong
2016-12-21 16:53 ` Dan Williams
2016-12-21 16:53 ` Dan Williams
2016-12-21 16:53 ` Dan Williams
2016-12-21 16:53 ` Dan Williams
2016-12-21 21:24 ` Dave Chinner
2016-12-21 21:24 ` Dave Chinner
2016-12-21 21:24 ` Dave Chinner
2016-12-21 21:24 ` Dave Chinner
2016-12-21 21:33 ` Dan Williams
2016-12-21 21:33 ` Dan Williams
2016-12-21 21:33 ` Dan Williams
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