From: Jerome Glisse <jglisse@redhat.com>
To: John Hubbard <jhubbard@nvidia.com>
Cc: Ira Weiny <ira.weiny@intel.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Dan Williams <dan.j.williams@intel.com>
Subject: Re: [PATCH v2 07/11] mm/hmm: add default fault flags to avoid the need to pre-fill pfns arrays.
Date: Thu, 28 Mar 2019 21:59:19 -0400 [thread overview]
Message-ID: <20190329015919.GF16680@redhat.com> (raw)
In-Reply-To: <20190329014259.GD16680@redhat.com>
On Thu, Mar 28, 2019 at 09:42:59PM -0400, Jerome Glisse wrote:
> On Thu, Mar 28, 2019 at 06:30:26PM -0700, John Hubbard wrote:
> > On 3/28/19 6:17 PM, Jerome Glisse wrote:
> > > On Thu, Mar 28, 2019 at 09:42:31AM -0700, Ira Weiny wrote:
> > >> On Thu, Mar 28, 2019 at 04:28:47PM -0700, John Hubbard wrote:
> > >>> On 3/28/19 4:21 PM, Jerome Glisse wrote:
> > >>>> On Thu, Mar 28, 2019 at 03:40:42PM -0700, John Hubbard wrote:
> > >>>>> On 3/28/19 3:31 PM, Jerome Glisse wrote:
> > >>>>>> On Thu, Mar 28, 2019 at 03:19:06PM -0700, John Hubbard wrote:
> > >>>>>>> On 3/28/19 3:12 PM, Jerome Glisse wrote:
> > >>>>>>>> On Thu, Mar 28, 2019 at 02:59:50PM -0700, John Hubbard wrote:
> > >>>>>>>>> On 3/25/19 7:40 AM, jglisse@redhat.com wrote:
> > >>>>>>>>>> From: Jérôme Glisse <jglisse@redhat.com>
> > >>> [...]
> > >> Indeed I did not realize there is an hmm "pfn" until I saw this function:
> > >>
> > >> /*
> > >> * hmm_pfn_from_pfn() - create a valid HMM pfn value from pfn
> > >> * @range: range use to encode HMM pfn value
> > >> * @pfn: pfn value for which to create the HMM pfn
> > >> * Returns: valid HMM pfn for the pfn
> > >> */
> > >> static inline uint64_t hmm_pfn_from_pfn(const struct hmm_range *range,
> > >> unsigned long pfn)
> > >>
> > >> So should this patch contain some sort of helper like this... maybe?
> > >>
> > >> I'm assuming the "hmm_pfn" being returned above is the device pfn being
> > >> discussed here?
> > >>
> > >> I'm also thinking calling it pfn is confusing. I'm not advocating a new type
> > >> but calling the "device pfn's" "hmm_pfn" or "device_pfn" seems like it would
> > >> have shortened the discussion here.
> > >>
> > >
> > > That helper is also use today by nouveau so changing that name is not that
> > > easy it does require the multi-release dance. So i am not sure how much
> > > value there is in a name change.
> > >
> >
> > Once the dust settles, I would expect that a name change for this could go
> > via Andrew's tree, right? It seems incredible to claim that we've built something
> > that effectively does not allow any minor changes!
> >
> > I do think it's worth some *minor* trouble to improve the name, assuming that we
> > can do it in a simple patch, rather than some huge maintainer-level effort.
>
> Change to nouveau have to go through nouveau tree so changing name means:
> - release N add function with new name, maybe make the old function just
> a wrapper to the new function
> - release N+1 update user to use the new name
> - release N+2 remove the old name
>
> So it is do-able but it is painful so i rather do that one latter that now
> as i am sure people will then complain again about some little thing and it
> will post pone this whole patchset on that new bit. To avoid post-poning
> RDMA and bunch of other patchset that build on top of that i rather get
> this patchset in and then do more changes in the next cycle.
>
> This is just a capacity thing.
Also for clarity changes to API i am doing in this patchset is to make
the ODP convertion easier and thus they bring a real hard value. Renaming
those function is esthetic, i am not saying it is useless, i am saying it
does not have the same value as those other changes and i would rather not
miss another merge window just for esthetic changes.
Cheers,
Jérôme
next prev parent reply other threads:[~2019-03-29 1:59 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-25 14:40 [PATCH v2 00/11] Improve HMM driver API v2 jglisse
2019-03-25 14:40 ` [PATCH v2 01/11] mm/hmm: select mmu notifier when selecting HMM jglisse
2019-03-28 20:33 ` John Hubbard
2019-03-29 21:15 ` Jerome Glisse
2019-03-29 21:42 ` John Hubbard
2019-03-25 14:40 ` [PATCH v2 02/11] mm/hmm: use reference counting for HMM struct v2 jglisse
2019-03-28 11:07 ` Ira Weiny
2019-03-28 19:11 ` Jerome Glisse
2019-03-28 20:43 ` John Hubbard
2019-03-28 21:21 ` Jerome Glisse
2019-03-29 0:39 ` John Hubbard
2019-03-28 16:57 ` Ira Weiny
2019-03-29 1:00 ` Jerome Glisse
2019-03-29 1:18 ` John Hubbard
2019-03-29 1:50 ` Jerome Glisse
2019-03-28 18:21 ` Ira Weiny
2019-03-29 2:25 ` Jerome Glisse
2019-03-29 20:07 ` John Hubbard
2019-03-29 2:11 ` John Hubbard
2019-03-29 2:22 ` Jerome Glisse
2019-03-25 14:40 ` [PATCH v2 03/11] mm/hmm: do not erase snapshot when a range is invalidated jglisse
2019-03-25 14:40 ` [PATCH v2 04/11] mm/hmm: improve and rename hmm_vma_get_pfns() to hmm_range_snapshot() v2 jglisse
2019-03-28 13:30 ` Ira Weiny
2019-03-25 14:40 ` [PATCH v2 05/11] mm/hmm: improve and rename hmm_vma_fault() to hmm_range_fault() v2 jglisse
2019-03-28 13:43 ` Ira Weiny
2019-03-28 22:03 ` Jerome Glisse
2019-03-25 14:40 ` [PATCH v2 06/11] mm/hmm: improve driver API to work and wait over a range v2 jglisse
2019-03-28 13:11 ` Ira Weiny
2019-03-28 21:39 ` Jerome Glisse
2019-03-28 16:12 ` Ira Weiny
2019-03-29 0:56 ` Jerome Glisse
2019-03-28 18:49 ` Ira Weiny
2019-03-25 14:40 ` [PATCH v2 07/11] mm/hmm: add default fault flags to avoid the need to pre-fill pfns arrays jglisse
2019-03-28 21:59 ` John Hubbard
2019-03-28 22:12 ` Jerome Glisse
2019-03-28 22:19 ` John Hubbard
2019-03-28 22:31 ` Jerome Glisse
2019-03-28 22:40 ` John Hubbard
2019-03-28 23:21 ` Jerome Glisse
2019-03-28 23:28 ` John Hubbard
2019-03-28 16:42 ` Ira Weiny
2019-03-29 1:17 ` Jerome Glisse
2019-03-29 1:30 ` John Hubbard
2019-03-29 1:42 ` Jerome Glisse
2019-03-29 1:59 ` Jerome Glisse [this message]
2019-03-29 2:05 ` John Hubbard
2019-03-29 2:12 ` Jerome Glisse
2019-03-28 23:43 ` Jerome Glisse
2019-03-25 14:40 ` [PATCH v2 08/11] mm/hmm: mirror hugetlbfs (snapshoting, faulting and DMA mapping) v2 jglisse
2019-03-28 16:53 ` Ira Weiny
2019-03-25 14:40 ` [PATCH v2 09/11] mm/hmm: allow to mirror vma of a file on a DAX backed filesystem v2 jglisse
2019-03-28 18:04 ` Ira Weiny
2019-03-29 2:17 ` Jerome Glisse
2019-03-25 14:40 ` [PATCH v2 10/11] mm/hmm: add helpers for driver to safely take the mmap_sem v2 jglisse
2019-03-28 20:54 ` John Hubbard
2019-03-28 21:30 ` Jerome Glisse
2019-03-28 21:41 ` John Hubbard
2019-03-28 22:08 ` Jerome Glisse
2019-03-28 22:25 ` John Hubbard
2019-03-28 22:40 ` Jerome Glisse
2019-03-28 22:43 ` John Hubbard
2019-03-28 23:05 ` Jerome Glisse
2019-03-28 23:20 ` John Hubbard
2019-03-28 23:24 ` Jerome Glisse
2019-03-28 23:34 ` John Hubbard
2019-03-28 18:44 ` Ira Weiny
2019-03-25 14:40 ` [PATCH v2 11/11] mm/hmm: add an helper function that fault pages and map them to a device v2 jglisse
2019-04-01 11:59 ` Souptick Joarder
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