From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Dan Williams <dan.j.williams@intel.com>,
Nilesh Choudhury <nilesh.choudhury@oracle.com>
Cc: Jan Kara <jack@suse.cz>, Matthew Wilcox <mawilcox@microsoft.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Linux MM <linux-mm@kvack.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Jan Kara <jack@suse.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [PATCH 0/3] 1G transparent hugepage support for device dax
Date: Tue, 24 Jan 2017 16:24:35 -0500 [thread overview]
Message-ID: <20170124212435.GA23874@char.us.oracle.com> (raw)
In-Reply-To: <CAPcyv4gW7cho=eE4BQZQ69J7ehREurP6CPbQX3z6eW7BUVT3Bw@mail.gmail.com>
On Tue, Jan 24, 2017 at 10:26:54AM -0800, Dan Williams wrote:
> On Tue, Jan 24, 2017 at 3:12 AM, Jan Kara <jack@suse.cz> wrote:
> > On Mon 23-01-17 16:47:18, Dave Jiang wrote:
> >> The following series implements support for 1G trasparent hugepage on
> >> x86 for device dax. The bulk of the code was written by Mathew Wilcox
> >> a while back supporting transparent 1G hugepage for fs DAX. I have
> >> forward ported the relevant bits to 4.10-rc. The current submission has
> >> only the necessary code to support device DAX.
> >
> > Well, you should really explain why do we want this functionality... Is
> > anybody going to use it? Why would he want to and what will he gain by
> > doing so? Because so far I haven't heard of a convincing usecase.
> >
>
> So the motivation and intended user of this functionality mirrors the
> motivation and users of 1GB page support in hugetlbfs. Given expected
> capacities of persistent memory devices an in-memory database may want
> to reduce tlb pressure beyond what they can already achieve with 2MB
> mappings of a device-dax file. We have customer feedback to that
> effect as Willy mentioned in his previous version of these patches
> [1].
CCing Nilesh who may be able to shed some more light on this.
>
> [1]: https://lkml.org/lkml/2016/1/31/52
> _______________________________________________
> Linux-nvdimm mailing list
> Linux-nvdimm@lists.01.org
> https://lists.01.org/mailman/listinfo/linux-nvdimm
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next prev parent reply other threads:[~2017-01-24 21:24 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-23 23:47 [PATCH 0/3] 1G transparent hugepage support for device dax Dave Jiang
2017-01-23 23:47 ` Dave Jiang
2017-01-23 23:47 ` [PATCH 1/3] mm,fs,dax: Change ->pmd_fault to ->huge_fault Dave Jiang
2017-01-23 23:47 ` Dave Jiang
2017-01-23 23:47 ` [PATCH 2/3] mm, x86: Add support for PUD-sized transparent hugepages Dave Jiang
2017-01-23 23:47 ` Dave Jiang
2017-01-23 23:47 ` [PATCH 3/3] dax: Support for transparent PUD pages for device DAX Dave Jiang
2017-01-23 23:47 ` Dave Jiang
2017-01-24 11:12 ` [PATCH 0/3] 1G transparent hugepage support for device dax Jan Kara
2017-01-24 18:26 ` Dan Williams
2017-01-24 18:26 ` Dan Williams
2017-01-24 21:24 ` Konrad Rzeszutek Wilk [this message]
2017-01-24 21:35 ` Nilesh Choudhury
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