lkml.org 
[lkml]   [2022]   [Dec]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 2/9] mm/hugetlb: Don't wait for migration entry during follow page
Date
That's what the code does with !hugetlb pages, so we should logically do
the same for hugetlb, so migration entry will also be treated as no page.

This is probably also the last piece in follow_page code that may sleep,
the last one should be removed in cf994dd8af27 ("mm/gup: remove
FOLL_MIGRATION", 2022-11-16).

Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
mm/hugetlb.c | 11 -----------
1 file changed, 11 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 0dfe441f9f4d..8ccd55f9fbd3 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6380,7 +6380,6 @@ struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
if (WARN_ON_ONCE(flags & FOLL_PIN))
return NULL;

-retry:
pte = huge_pte_offset(mm, haddr, huge_page_size(h));
if (!pte)
return NULL;
@@ -6403,16 +6402,6 @@ struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
page = NULL;
goto out;
}
- } else {
- if (is_hugetlb_entry_migration(entry)) {
- spin_unlock(ptl);
- __migration_entry_wait_huge(pte, ptl);
- goto retry;
- }
- /*
- * hwpoisoned entry is treated as no_page_table in
- * follow_page_mask().
- */
}
out:
spin_unlock(ptl);
--
2.37.3
\
 
 \ /
  Last update: 2022-12-16 16:53    [W:0.079 / U:1.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site