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mm: use find_get_incore_page in memcontrol

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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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: William Kucharski <william.kucharski@oracle.com>
Link: https://lkml.kernel.org/r/20200910183318.20139-3-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2020-10-13 16:51:21 -07:00 • committed by Linus Torvalds
parent 61ef186557
commit f5df8635c5
1 changed files with 2 additions and 22 deletions
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24
mm/memcontrol.c
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@ -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, static struct page *mc_handle_file_pte(struct vm_area_struct *vma,
unsigned long addr, pte_t ptent, swp_entry_t *entry) 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 */ if (!vma->vm_file) /* anonymous vma */
return NULL; return NULL;
if (!(mc.flags & MOVE_FILE)) if (!(mc.flags & MOVE_FILE))
return NULL; 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). */ /* 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. */ /* shmem/tmpfs may report page out on swap: account for that too. */
if (shmem_mapping(mapping)) { return find_get_incore_page(vma->vm_file->f_mapping,
page = find_get_entry(mapping, pgoff); linear_page_index(vma, addr));
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;
} }
/** /**