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>,
Daniel Jordan <daniel.m.jordan@oracle.com>,
John Hubbard <jhubbard@nvidia.com>
Subject: Re: [PATCH RFC 7/9] mm/gup: Decrement head page once for group of subpages
Date: Thu, 17 Dec 2020 22:34:54 +0000 [thread overview]
Message-ID: <7c8078df-1151-3668-5cee-80c976df1ff6@oracle.com> (raw)
In-Reply-To: <20201217200530.GK5487@ziepe.ca>
On 12/17/20 8:05 PM, Jason Gunthorpe wrote:
> On Thu, Dec 17, 2020 at 07:05:37PM +0000, Joao Martins wrote:
>>> No reason not to fix set_page_dirty_lock() too while you are here.
>>
>> The wack of atomics you mentioned earlier you referred to, I suppose it
>> ends being account_page_dirtied(). See partial diff at the end.
>
> Well, even just eliminating the lock_page, page_mapping, PageDirty,
> etc is already a big win.
>
> If mapping->a_ops->set_page_dirty() needs to be called multiple times
> on the head page I'd probably just suggest:
>
> while (ntails--)
> rc |= (*spd)(head);
>
> At least as a start.
>
/me nods
> If you have workloads that have page_mapping != NULL then look at
> another series to optimze that. Looks a bit large though given the
> number of places implementing set_page_dirty
>
Yes. I don't have a particular workload, was just wondering what you had in
mind, as at a glance, changing all the places without messing filesystems looks like
the subject of a separate series.
> I think the current reality is calling set_page_dirty on an actual
> file system is busted anyhow, so I think mapping is generally going to
> be NULL here?
Perhaps -- I'll have to check.
Joao
next prev parent reply other threads:[~2020-12-17 22:35 UTC|newest]
Thread overview: 80+ 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 ` [PATCH RFC 1/9] memremap: add ZONE_DEVICE support for compound pages Joao Martins
2020-12-09 5:59 ` John Hubbard
2020-12-09 6:33 ` Matthew Wilcox
2020-12-09 13:12 ` Joao Martins
2021-02-20 1:43 ` Dan Williams
2021-02-22 11:24 ` Joao Martins
2021-02-22 20:37 ` Dan Williams
2021-02-23 15:46 ` Joao Martins
2021-02-23 16:50 ` Dan Williams
2021-02-23 17:18 ` Joao Martins
2021-02-23 18:18 ` Dan Williams
2021-03-10 18:12 ` Joao Martins
2021-03-12 5:54 ` Dan Williams
2021-02-20 1:24 ` Dan Williams
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
2020-12-09 6:16 ` John Hubbard
2020-12-09 13:51 ` Joao Martins
2021-02-20 1:49 ` Dan Williams
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 17:38 ` Joao Martins
2020-12-08 17:28 ` [PATCH RFC 3/9] sparse-vmemmap: Reuse vmemmap areas for a given page size Joao Martins
2021-02-20 3:34 ` Dan Williams
2021-02-22 11:42 ` Joao Martins
2021-02-22 22:40 ` Dan Williams
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
2021-02-20 6:17 ` Dan Williams
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 ` [PATCH RFC 6/9] mm/gup: Grab head page refcount once for group of subpages Joao Martins
2020-12-08 19:49 ` Jason Gunthorpe
2020-12-09 11:05 ` Joao Martins
2020-12-09 15:15 ` Jason Gunthorpe
2020-12-09 16:02 ` Joao Martins
2020-12-09 16:24 ` Jason Gunthorpe
2020-12-09 17:27 ` Joao Martins
2020-12-09 18:14 ` Matthew Wilcox
2020-12-09 19:08 ` Jason Gunthorpe
2020-12-10 15:43 ` Joao Martins
2020-12-09 4:40 ` John Hubbard
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 19:34 ` Jason Gunthorpe
2020-12-09 5:06 ` John Hubbard
2020-12-09 13:43 ` Jason Gunthorpe
2020-12-09 12:17 ` Joao Martins
2020-12-17 19:05 ` Joao Martins
2020-12-17 20:05 ` Jason Gunthorpe
2020-12-17 22:34 ` Joao Martins [this message]
2020-12-18 14:25 ` Jason Gunthorpe
2020-12-19 2:06 ` John Hubbard
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 19:29 ` Jason Gunthorpe
2020-12-09 10:59 ` Joao Martins
2020-12-19 13:15 ` Joao Martins
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 19:57 ` Jason Gunthorpe
2020-12-09 8:05 ` Christoph Hellwig
2020-12-09 11:19 ` Joao Martins
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 9:52 ` [External] " Muchun Song
2021-02-20 1:18 ` Dan Williams
2021-02-22 11:06 ` Joao Martins
2021-02-22 14:32 ` Joao Martins
2021-02-23 16:28 ` Joao Martins
2021-02-23 16:44 ` Dan Williams
2021-02-23 17:15 ` Joao Martins
2021-02-23 18:15 ` Dan Williams
2021-02-23 18:54 ` Jason Gunthorpe
2021-02-23 22:48 ` Dan Williams
2021-02-23 23:07 ` Jason Gunthorpe
2021-02-24 0:14 ` Dan Williams
2021-02-24 1:00 ` Jason Gunthorpe
2021-02-24 1:32 ` Dan Williams
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