From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-mm@kvack.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
William Kucharski <william.kucharski@oracle.com>,
Jani Nikula <jani.nikula@linux.intel.com>,
Alexey Dobriyan <adobriyan@gmail.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Chris Wilson <chris@chris-wilson.co.uk>,
Matthew Auld <matthew.auld@intel.com>,
Huang Ying <ying.huang@intel.com>,
intel-gfx@lists.freedesktop.org, cgroups@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/8] mm: Use find_get_incore_page in memcontrol
Date: Thu, 10 Sep 2020 19:33:12 +0100 [thread overview]
Message-ID: <20200910183318.20139-3-willy@infradead.org> (raw)
In-Reply-To: <20200910183318.20139-1-willy@infradead.org>
The current code does not protect against swapoff of the underlying
swap device, so this is a bug fix as well as a worthwhile reduction in
code complexity.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
mm/memcontrol.c | 24 ++----------------------
1 file changed, 2 insertions(+), 22 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b807952b4d43..2f02eaee7115 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5539,35 +5539,15 @@ static struct page *mc_handle_swap_pte(struct vm_area_struct *vma,
static struct page *mc_handle_file_pte(struct vm_area_struct *vma,
unsigned long addr, pte_t ptent, swp_entry_t *entry)
{
- struct page *page = NULL;
- struct address_space *mapping;
- pgoff_t pgoff;
-
if (!vma->vm_file) /* anonymous vma */
return NULL;
if (!(mc.flags & MOVE_FILE))
return NULL;
- mapping = vma->vm_file->f_mapping;
- pgoff = linear_page_index(vma, addr);
-
/* page is moved even if it's not RSS of this task(page-faulted). */
-#ifdef CONFIG_SWAP
/* shmem/tmpfs may report page out on swap: account for that too. */
- if (shmem_mapping(mapping)) {
- page = find_get_entry(mapping, pgoff);
- if (xa_is_value(page)) {
- swp_entry_t swp = radix_to_swp_entry(page);
- *entry = swp;
- page = find_get_page(swap_address_space(swp),
- swp_offset(swp));
- }
- } else
- page = find_get_page(mapping, pgoff);
-#else
- page = find_get_page(mapping, pgoff);
-#endif
- return page;
+ return find_get_incore_page(vma->vm_file->f_mapping,
+ linear_page_index(vma, addr));
}
/**
--
2.28.0
next prev parent reply other threads:[~2020-09-10 18:33 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-10 18:33 [PATCH v2 0/8] Return head pages from find_*_entry Matthew Wilcox (Oracle)
2020-09-10 18:33 ` [PATCH v2 1/8] mm: Factor find_get_incore_page out of mincore_page Matthew Wilcox (Oracle)
2020-09-10 18:33 ` Matthew Wilcox (Oracle) [this message]
2020-09-10 18:33 ` [PATCH v2 3/8] mm: Optimise madvise WILLNEED Matthew Wilcox (Oracle)
2020-09-14 16:17 ` Qian Cai
2020-09-14 16:47 ` Qian Cai
2020-09-14 16:50 ` Matthew Wilcox
2020-09-14 19:44 ` Qian Cai
2020-09-10 18:33 ` [PATCH v2 4/8] proc: Optimise smaps for shmem entries Matthew Wilcox (Oracle)
2020-09-10 18:33 ` [PATCH v2 5/8] i915: Use find_lock_page instead of find_lock_entry Matthew Wilcox (Oracle)
2020-09-10 18:33 ` [PATCH v2 6/8] mm: Convert find_get_entry to return the head page Matthew Wilcox (Oracle)
2020-09-14 8:55 ` [mm] 2037ab69a5: BUG:KASAN:null-ptr-deref_in_t kernel test robot
2020-09-14 11:27 ` Matthew Wilcox
2020-09-10 18:33 ` [PATCH v2 7/8] mm/shmem: Return head page from find_lock_entry Matthew Wilcox (Oracle)
2020-09-12 3:20 ` Matthew Wilcox
2020-09-10 18:33 ` [PATCH v2 8/8] mm: Add find_lock_head Matthew Wilcox (Oracle)
2020-09-15 8:10 ` [PATCH v2 0/8] Return head pages from find_*_entry Hugh Dickins
2020-09-15 12:53 ` Naresh Kamboju
2020-09-15 13:08 ` Matthew Wilcox
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