From: Joao Martins <joao.m.martins@oracle.com>
To: linux-mm@kvack.org
Cc: Dan Williams <dan.j.williams@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Naoya Horiguchi <naoya.horiguchi@nec.com>,
Matthew Wilcox <willy@infradead.org>,
Jason Gunthorpe <jgg@ziepe.ca>,
John Hubbard <jhubbard@nvidia.com>,
Jane Chu <jane.chu@oracle.com>,
Muchun Song <songmuchun@bytedance.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
Jonathan Corbet <corbet@lwn.net>, Christoph Hellwig <hch@lst.de>,
nvdimm@lists.linux.dev, linux-doc@vger.kernel.org,
Joao Martins <joao.m.martins@oracle.com>
Subject: [PATCH v7 02/11] mm/page_alloc: split prep_compound_page into head and tail subparts
Date: Thu, 2 Dec 2021 20:44:13 +0000 [thread overview]
Message-ID: <20211202204422.26777-3-joao.m.martins@oracle.com> (raw)
In-Reply-To: <20211202204422.26777-1-joao.m.martins@oracle.com>
Split the utility function prep_compound_page() into head and tail
counterparts, and use them accordingly.
This is in preparation for sharing the storage for compound page
metadata.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
---
mm/page_alloc.c | 30 ++++++++++++++++++++----------
1 file changed, 20 insertions(+), 10 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 58490fa8948d..ba096f731e36 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -727,23 +727,33 @@ void free_compound_page(struct page *page)
free_the_page(page, compound_order(page));
}
+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;
+
+ 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;
- 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
--
2.17.2
next prev parent reply other threads:[~2021-12-02 20:45 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-02 20:44 [PATCH v7 00/11] mm, device-dax: Introduce compound pages in devmap Joao Martins
2021-12-02 20:44 ` [PATCH v7 01/11] memory-failure: fetch compound_head after pgmap_pfn_valid() Joao Martins
2021-12-02 20:44 ` Joao Martins [this message]
2021-12-02 20:44 ` [PATCH v7 03/11] mm/page_alloc: refactor memmap_init_zone_device() page init Joao Martins
2021-12-02 20:44 ` [PATCH v7 04/11] mm/memremap: add ZONE_DEVICE support for compound pages Joao Martins
2021-12-02 20:44 ` [PATCH v7 05/11] device-dax: use ALIGN() for determining pgoff Joao Martins
2021-12-02 20:44 ` [PATCH v7 06/11] device-dax: use struct_size() Joao Martins
2021-12-02 20:44 ` [PATCH v7 07/11] device-dax: ensure dev_dax->pgmap is valid for dynamic devices Joao Martins
2021-12-02 20:44 ` [PATCH v7 08/11] device-dax: factor out page mapping initialization Joao Martins
2021-12-02 20:44 ` [PATCH v7 09/11] device-dax: set mapping prior to vmf_insert_pfn{,_pmd,pud}() Joao Martins
2021-12-02 20:44 ` [PATCH v7 10/11] device-dax: remove pfn from __dev_dax_{pte,pmd,pud}_fault() Joao Martins
2021-12-03 7:30 ` kernel test robot
2021-12-02 20:44 ` [PATCH v7 11/11] device-dax: compound devmap support Joao Martins
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