From: Joao Martins <joao.m.martins@oracle.com>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-mm@kvack.org, linux-nvdimm@lists.01.org,
Matthew Wilcox <willy@infradead.org>,
Muchun Song <songmuchun@bytedance.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH RFC 6/9] mm/gup: Grab head page refcount once for group of subpages
Date: Wed, 9 Dec 2020 17:27:57 +0000 [thread overview]
Message-ID: <3f2ce09a-03b4-6c36-0ea0-7635ec15bf05@oracle.com> (raw)
In-Reply-To: <20201209162438.GW5487@ziepe.ca>
On 12/9/20 4:24 PM, Jason Gunthorpe wrote:
> On Wed, Dec 09, 2020 at 04:02:05PM +0000, Joao Martins wrote:
>
>> Today (without the series) struct pages are not represented the way they
>> are expressed in the page tables, which is what I am hoping to fix in this
>> series thus initializing these as compound pages of a given order. But me
>> introducing PGMAP_COMPOUND was to conservatively keep both old (non-compound)
>> and new (compound pages) co-exist.
>
> Oooh, that I didn't know.. That is kind of horrible to have a PMD
> pointing at an order 0 page only in this one special case.
>
> Still, I think it would be easier to teach record_subpages() that a
> PMD doesn't necessarily point to a high order page, eg do something
> like I suggested for the SGL where it extracts the page order and
> iterates over the contiguous range of pfns.
>
/me nods
> This way it can remain general with no particularly special path for
> devmap or a special PGMAP_COMPOUND check here.
The less special paths the better, indeed.
Joao
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WARNING: multiple messages have this Message-ID (diff)
From: Joao Martins <joao.m.martins@oracle.com>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-mm@kvack.org, Dan Williams <dan.j.williams@intel.com>,
Ira Weiny <ira.weiny@intel.com>,
linux-nvdimm@lists.01.org, Matthew Wilcox <willy@infradead.org>,
Jane Chu <jane.chu@oracle.com>,
Muchun Song <songmuchun@bytedance.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH RFC 6/9] mm/gup: Grab head page refcount once for group of subpages
Date: Wed, 9 Dec 2020 17:27:57 +0000 [thread overview]
Message-ID: <3f2ce09a-03b4-6c36-0ea0-7635ec15bf05@oracle.com> (raw)
In-Reply-To: <20201209162438.GW5487@ziepe.ca>
On 12/9/20 4:24 PM, Jason Gunthorpe wrote:
> On Wed, Dec 09, 2020 at 04:02:05PM +0000, Joao Martins wrote:
>
>> Today (without the series) struct pages are not represented the way they
>> are expressed in the page tables, which is what I am hoping to fix in this
>> series thus initializing these as compound pages of a given order. But me
>> introducing PGMAP_COMPOUND was to conservatively keep both old (non-compound)
>> and new (compound pages) co-exist.
>
> Oooh, that I didn't know.. That is kind of horrible to have a PMD
> pointing at an order 0 page only in this one special case.
>
> Still, I think it would be easier to teach record_subpages() that a
> PMD doesn't necessarily point to a high order page, eg do something
> like I suggested for the SGL where it extracts the page order and
> iterates over the contiguous range of pfns.
>
/me nods
> This way it can remain general with no particularly special path for
> devmap or a special PGMAP_COMPOUND check here.
The less special paths the better, indeed.
Joao
next prev parent reply other threads:[~2020-12-09 17:28 UTC|newest]
Thread overview: 147+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-08 17:28 [PATCH RFC 0/9] mm, sparse-vmemmap: Introduce compound pagemaps Joao Martins
2020-12-08 17:28 ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 1/9] memremap: add ZONE_DEVICE support for compound pages Joao Martins
2020-12-08 17:28 ` Joao Martins
2020-12-09 5:59 ` John Hubbard
2020-12-09 5:59 ` John Hubbard
2020-12-09 6:33 ` Matthew Wilcox
2020-12-09 6:33 ` Matthew Wilcox
2020-12-09 13:12 ` Joao Martins
2020-12-09 13:12 ` Joao Martins
2021-02-20 1:43 ` Dan Williams
2021-02-20 1:43 ` Dan Williams
2021-02-22 11:24 ` Joao Martins
2021-02-22 11:24 ` Joao Martins
2021-02-22 20:37 ` Dan Williams
2021-02-22 20:37 ` Dan Williams
2021-02-23 15:46 ` Joao Martins
2021-02-23 15:46 ` Joao Martins
2021-02-23 16:50 ` Dan Williams
2021-02-23 16:50 ` Dan Williams
2021-02-23 17:18 ` Joao Martins
2021-02-23 17:18 ` Joao Martins
2021-02-23 18:18 ` Dan Williams
2021-02-23 18:18 ` Dan Williams
2021-03-10 18:12 ` Joao Martins
2021-03-10 18:12 ` Joao Martins
2021-03-12 5:54 ` Dan Williams
2021-03-12 5:54 ` Dan Williams
2021-02-20 1:24 ` Dan Williams
2021-02-20 1:24 ` Dan Williams
2021-02-22 11:09 ` Joao Martins
2021-02-22 11:09 ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 2/9] sparse-vmemmap: Consolidate arguments in vmemmap section populate Joao Martins
2020-12-08 17:28 ` Joao Martins
2020-12-09 6:16 ` John Hubbard
2020-12-09 6:16 ` John Hubbard
2020-12-09 13:51 ` Joao Martins
2020-12-09 13:51 ` Joao Martins
2021-02-20 1:49 ` Dan Williams
2021-02-20 1:49 ` Dan Williams
2021-02-22 11:26 ` Joao Martins
2021-02-22 11:26 ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 3/9] sparse-vmemmap: Reuse vmemmap areas for a given mhp_params::align Joao Martins
2020-12-08 17:28 ` Joao Martins
2020-12-08 17:38 ` Joao Martins
2020-12-08 17:38 ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 3/9] sparse-vmemmap: Reuse vmemmap areas for a given page size Joao Martins
2020-12-08 17:28 ` Joao Martins
2021-02-20 3:34 ` Dan Williams
2021-02-20 3:34 ` Dan Williams
2021-02-22 11:42 ` Joao Martins
2021-02-22 11:42 ` Joao Martins
2021-02-22 22:40 ` Dan Williams
2021-02-22 22:40 ` Dan Williams
2021-02-23 15:46 ` Joao Martins
2021-02-23 15:46 ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 4/9] mm/page_alloc: Reuse tail struct pages for compound pagemaps Joao Martins
2020-12-08 17:28 ` Joao Martins
2021-02-20 6:17 ` Dan Williams
2021-02-20 6:17 ` Dan Williams
2021-02-22 12:01 ` Joao Martins
2021-02-22 12:01 ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 5/9] device-dax: Compound pagemap support Joao Martins
2020-12-08 17:28 ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 6/9] mm/gup: Grab head page refcount once for group of subpages Joao Martins
2020-12-08 17:28 ` Joao Martins
2020-12-08 19:49 ` Jason Gunthorpe
2020-12-09 11:05 ` Joao Martins
2020-12-09 11:05 ` Joao Martins
2020-12-09 15:15 ` Jason Gunthorpe
2020-12-09 16:02 ` Joao Martins
2020-12-09 16:02 ` Joao Martins
2020-12-09 16:24 ` Jason Gunthorpe
2020-12-09 17:27 ` Joao Martins [this message]
2020-12-09 17:27 ` Joao Martins
2020-12-09 18:14 ` Matthew Wilcox
2020-12-09 18:14 ` Matthew Wilcox
2020-12-09 19:08 ` Jason Gunthorpe
2020-12-10 15:43 ` Joao Martins
2020-12-10 15:43 ` Joao Martins
2020-12-09 4:40 ` John Hubbard
2020-12-09 4:40 ` John Hubbard
2020-12-09 13:44 ` Joao Martins
2020-12-09 13:44 ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 7/9] mm/gup: Decrement head page " Joao Martins
2020-12-08 17:28 ` Joao Martins
2020-12-08 19:34 ` Jason Gunthorpe
2020-12-09 5:06 ` John Hubbard
2020-12-09 5:06 ` John Hubbard
2020-12-09 13:43 ` Jason Gunthorpe
2020-12-09 12:17 ` Joao Martins
2020-12-09 12:17 ` Joao Martins
2020-12-17 19:05 ` Joao Martins
2020-12-17 19:05 ` Joao Martins
2020-12-17 20:05 ` Jason Gunthorpe
2020-12-17 22:34 ` Joao Martins
2020-12-17 22:34 ` Joao Martins
2020-12-18 14:25 ` Jason Gunthorpe
2020-12-19 2:06 ` John Hubbard
2020-12-19 2:06 ` John Hubbard
2020-12-19 13:10 ` Joao Martins
2020-12-19 13:10 ` Joao Martins
2020-12-08 17:29 ` [PATCH RFC 8/9] RDMA/umem: batch page unpin in __ib_mem_release() Joao Martins
2020-12-08 17:29 ` Joao Martins
2020-12-08 19:29 ` Jason Gunthorpe
2020-12-09 10:59 ` Joao Martins
2020-12-09 10:59 ` Joao Martins
2020-12-19 13:15 ` Joao Martins
2020-12-19 13:15 ` Joao Martins
2020-12-09 5:18 ` John Hubbard
2020-12-09 5:18 ` John Hubbard
2020-12-08 17:29 ` [PATCH RFC 9/9] mm: Add follow_devmap_page() for devdax vmas Joao Martins
2020-12-08 17:29 ` Joao Martins
2020-12-08 19:57 ` Jason Gunthorpe
2020-12-09 8:05 ` Christoph Hellwig
2020-12-09 8:05 ` Christoph Hellwig
2020-12-09 11:19 ` Joao Martins
2020-12-09 11:19 ` Joao Martins
2020-12-09 5:23 ` John Hubbard
2020-12-09 5:23 ` John Hubbard
2020-12-09 9:38 ` [PATCH RFC 0/9] mm, sparse-vmemmap: Introduce compound pagemaps David Hildenbrand
2020-12-09 9:38 ` David Hildenbrand
2020-12-09 9:52 ` [External] " Muchun Song
2020-12-09 9:52 ` Muchun Song
2021-02-20 1:18 ` Dan Williams
2021-02-20 1:18 ` Dan Williams
2021-02-22 11:06 ` Joao Martins
2021-02-22 11:06 ` Joao Martins
2021-02-22 14:32 ` Joao Martins
2021-02-22 14:32 ` Joao Martins
2021-02-23 16:28 ` Joao Martins
2021-02-23 16:28 ` Joao Martins
2021-02-23 16:44 ` Dan Williams
2021-02-23 16:44 ` Dan Williams
2021-02-23 17:15 ` Joao Martins
2021-02-23 17:15 ` Joao Martins
2021-02-23 18:15 ` Dan Williams
2021-02-23 18:15 ` Dan Williams
2021-02-23 18:54 ` Jason Gunthorpe
2021-02-23 22:48 ` Dan Williams
2021-02-23 22:48 ` Dan Williams
2021-02-23 23:07 ` Jason Gunthorpe
2021-02-24 0:14 ` Dan Williams
2021-02-24 0:14 ` Dan Williams
2021-02-24 1:00 ` Jason Gunthorpe
2021-02-24 1:32 ` Dan Williams
2021-02-24 1:32 ` Dan Williams
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