From: Dan Williams <dan.j.williams@intel.com>
To: Joao Martins <joao.m.martins@oracle.com>
Cc: Linux MM <linux-mm@kvack.org>,
linux-nvdimm <linux-nvdimm@lists.01.org>,
Matthew Wilcox <willy@infradead.org>,
Jason Gunthorpe <jgg@ziepe.ca>, 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 v1 02/11] mm/page_alloc: split prep_compound_page into head and tail subparts
Date: Fri, 23 Apr 2021 17:16:09 -0700 [thread overview]
Message-ID: <CAPcyv4jrdrKXhnoWKPRUE+McjP_7BOrG8GYBoeGP1s9-aF5FxQ@mail.gmail.com> (raw)
In-Reply-To: <20210325230938.30752-3-joao.m.martins@oracle.com>
On Thu, Mar 25, 2021 at 4:10 PM Joao Martins <joao.m.martins@oracle.com> wrote:
>
> Split the utility function prep_compound_page() into head and tail
> counterparts, and use them accordingly.
To make this patch stand alone better lets add another sentence:
"This is in preparation for sharing the storage for / deduplicating
compound page metadata."
Other than that, looks good to me.
>
> Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
> ---
> mm/page_alloc.c | 32 +++++++++++++++++++++-----------
> 1 file changed, 21 insertions(+), 11 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index c53fe4fa10bf..43dd98446b0b 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -692,24 +692,34 @@ void free_compound_page(struct page *page)
> __free_pages_ok(page, compound_order(page), FPI_NONE);
> }
>
> +static void prep_compound_head(struct page *page, unsigned int order)
> +{
> + set_compound_page_dtor(page, COMPOUND_PAGE_DTOR);
> + set_compound_order(page, order);
> + atomic_set(compound_mapcount_ptr(page), -1);
> + if (hpage_pincount_available(page))
> + atomic_set(compound_pincount_ptr(page), 0);
> +}
> +
> +static void prep_compound_tail(struct page *head, int tail_idx)
> +{
> + struct page *p = head + tail_idx;
> +
> + set_page_count(p, 0);
> + p->mapping = TAIL_MAPPING;
> + set_compound_head(p, head);
> +}
> +
> void prep_compound_page(struct page *page, unsigned int order)
> {
> int i;
> int nr_pages = 1 << order;
>
> __SetPageHead(page);
> - for (i = 1; i < nr_pages; i++) {
> - struct page *p = page + i;
> - set_page_count(p, 0);
> - p->mapping = TAIL_MAPPING;
> - set_compound_head(p, page);
> - }
> + for (i = 1; i < nr_pages; i++)
> + prep_compound_tail(page, i);
>
> - set_compound_page_dtor(page, COMPOUND_PAGE_DTOR);
> - set_compound_order(page, order);
> - atomic_set(compound_mapcount_ptr(page), -1);
> - if (hpage_pincount_available(page))
> - atomic_set(compound_pincount_ptr(page), 0);
> + prep_compound_head(page, order);
> }
>
> #ifdef CONFIG_DEBUG_PAGEALLOC
> --
> 2.17.1
>
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next prev parent reply other threads:[~2021-04-24 0:16 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 23:09 [PATCH v1 00/11] mm, sparse-vmemmap: Introduce compound pagemaps Joao Martins
2021-03-25 23:09 ` [PATCH v1 01/11] memory-failure: fetch compound_head after pgmap_pfn_valid() Joao Martins
2021-04-24 0:12 ` Dan Williams
2021-04-24 19:00 ` Joao Martins
2021-03-25 23:09 ` [PATCH v1 02/11] mm/page_alloc: split prep_compound_page into head and tail subparts Joao Martins
2021-04-24 0:16 ` Dan Williams [this message]
2021-04-24 19:05 ` Joao Martins
2021-03-25 23:09 ` [PATCH v1 03/11] mm/page_alloc: refactor memmap_init_zone_device() page init Joao Martins
2021-04-24 0:18 ` Dan Williams
2021-04-24 19:05 ` Joao Martins
2021-03-25 23:09 ` [PATCH v1 04/11] mm/memremap: add ZONE_DEVICE support for compound pages Joao Martins
2021-05-05 18:44 ` Dan Williams
2021-05-05 18:58 ` Matthew Wilcox
2021-05-05 19:49 ` Joao Martins
2021-05-05 22:20 ` Dan Williams
2021-05-05 22:36 ` Joao Martins
2021-05-05 23:03 ` Dan Williams
2021-05-06 10:12 ` Joao Martins
2021-05-18 17:27 ` Joao Martins
2021-05-18 19:56 ` Jane Chu
2021-05-19 11:29 ` Joao Martins
2021-05-06 8:05 ` Aneesh Kumar K.V
2021-05-06 10:23 ` Joao Martins
2021-05-06 11:43 ` Matthew Wilcox
2021-05-06 12:15 ` Joao Martins
2021-03-25 23:09 ` [PATCH v1 05/11] mm/sparse-vmemmap: add a pgmap argument to section activation Joao Martins
2021-05-05 22:34 ` Dan Williams
2021-05-05 22:37 ` Joao Martins
2021-05-05 23:14 ` Dan Williams
2021-05-06 10:24 ` Joao Martins
2021-03-25 23:09 ` [PATCH v1 06/11] mm/sparse-vmemmap: refactor vmemmap_populate_basepages() Joao Martins
2021-05-05 22:43 ` Dan Williams
2021-05-06 10:27 ` Joao Martins
2021-05-06 18:36 ` Joao Martins
2021-03-25 23:09 ` [PATCH v1 07/11] mm/sparse-vmemmap: populate compound pagemaps Joao Martins
2021-05-06 1:18 ` Dan Williams
2021-05-06 11:01 ` Joao Martins
2021-05-10 19:19 ` Dan Williams
2021-05-13 18:45 ` Joao Martins
2021-03-25 23:09 ` [PATCH v1 08/11] mm/sparse-vmemmap: use hugepages for PUD " Joao Martins
2021-03-25 23:09 ` [PATCH v1 09/11] mm/page_alloc: reuse tail struct pages for " Joao Martins
2021-03-25 23:09 ` [PATCH v1 10/11] device-dax: compound pagemap support Joao Martins
2021-03-25 23:09 ` [PATCH v1 11/11] mm/gup: grab head page refcount once for group of subpages Joao Martins
2021-04-01 9:38 ` [PATCH v1 00/11] mm, sparse-vmemmap: Introduce compound pagemaps Joao Martins
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