[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240409192301.907377-15-david@redhat.com>
Date: Tue, 9 Apr 2024 21:22:57 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
linux-doc@...r.kernel.org,
cgroups@...r.kernel.org,
linux-sh@...r.kernel.org,
linux-trace-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org,
David Hildenbrand <david@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
Peter Xu <peterx@...hat.com>,
Ryan Roberts <ryan.roberts@....com>,
Yin Fengwei <fengwei.yin@...el.com>,
Yang Shi <shy828301@...il.com>,
Zi Yan <ziy@...dia.com>,
Jonathan Corbet <corbet@....net>,
Hugh Dickins <hughd@...gle.com>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Rich Felker <dalias@...c.org>,
John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
Chris Zankel <chris@...kel.net>,
Max Filippov <jcmvbkbc@...il.com>,
Muchun Song <muchun.song@...ux.dev>,
Miaohe Lin <linmiaohe@...wei.com>,
Naoya Horiguchi <naoya.horiguchi@....com>,
Richard Chang <richardycc@...gle.com>
Subject: [PATCH v1 14/18] mm/migrate_device: use folio_mapcount() in migrate_vma_check_page()
We want to limit the use of page_mapcount() to the places where it is
absolutely necessary. Let's convert migrate_vma_check_page() to work on
a folio internally so we can remove the page_mapcount() usage.
Note that we reject any large folios.
There is a lot more folio conversion to be had, but that has to wait for
another day. No functional change intended.
Signed-off-by: David Hildenbrand <david@...hat.com>
---
mm/migrate_device.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/mm/migrate_device.c b/mm/migrate_device.c
index d40b46ae9d65..b929b450b77c 100644
--- a/mm/migrate_device.c
+++ b/mm/migrate_device.c
@@ -324,6 +324,8 @@ static void migrate_vma_collect(struct migrate_vma *migrate)
*/
static bool migrate_vma_check_page(struct page *page, struct page *fault_page)
{
+ struct folio *folio = page_folio(page);
+
/*
* One extra ref because caller holds an extra reference, either from
* isolate_lru_page() for a regular page, or migrate_vma_collect() for
@@ -336,18 +338,18 @@ static bool migrate_vma_check_page(struct page *page, struct page *fault_page)
* check them than regular pages, because they can be mapped with a pmd
* or with a pte (split pte mapping).
*/
- if (PageCompound(page))
+ if (folio_test_large(folio))
return false;
/* Page from ZONE_DEVICE have one extra reference */
- if (is_zone_device_page(page))
+ if (folio_is_zone_device(folio))
extra++;
/* For file back page */
- if (page_mapping(page))
- extra += 1 + page_has_private(page);
+ if (folio_mapping(folio))
+ extra += 1 + folio_has_private(folio);
- if ((page_count(page) - extra) > page_mapcount(page))
+ if ((folio_ref_count(folio) - extra) > folio_mapcount(folio))
return false;
return true;
--
2.44.0
Powered by blists - more mailing lists