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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2017-02-24 14:57:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-24 17:46:55 -0800
commitf27176cfc363d395eea8dc5c4a26e5d6d7d65eaf (patch)
treef470459d19b549de9141a79a076d386305927e8d /mm
parenta8fa41ad2f6f7ca08edd1afcf8149ae5a4dcf654 (diff)
downloadlinux-f27176cfc363d395eea8dc5c4a26e5d6d7d65eaf.tar.gz
mm: convert page_mkclean_one() to use page_vma_mapped_walk()
For consistency, it worth converting all page_check_address() to page_vma_mapped_walk(), so we could drop the former. PMD handling here is future-proofing, we don't have users yet. ext4 with huge pages will be the first. Link: http://lkml.kernel.org/r/20170129173858.45174-7-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/rmap.c68
1 files changed, 45 insertions, 23 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index c4bad59..58597de 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1017,34 +1017,56 @@ int page_referenced(struct page *page,
static int page_mkclean_one(struct page *page, struct vm_area_struct *vma,
unsigned long address, void *arg)
{
- struct mm_struct *mm = vma->vm_mm;
- pte_t *pte;
- spinlock_t *ptl;
- int ret = 0;
+ struct page_vma_mapped_walk pvmw = {
+ .page = page,
+ .vma = vma,
+ .address = address,
+ .flags = PVMW_SYNC,
+ };
int *cleaned = arg;
- pte = page_check_address(page, mm, address, &ptl, 1);
- if (!pte)
- goto out;
-
- if (pte_dirty(*pte) || pte_write(*pte)) {
- pte_t entry;
+ while (page_vma_mapped_walk(&pvmw)) {
+ int ret = 0;
+ address = pvmw.address;
+ if (pvmw.pte) {
+ pte_t entry;
+ pte_t *pte = pvmw.pte;
+
+ if (!pte_dirty(*pte) && !pte_write(*pte))
+ continue;
+
+ flush_cache_page(vma, address, pte_pfn(*pte));
+ entry = ptep_clear_flush(vma, address, pte);
+ entry = pte_wrprotect(entry);
+ entry = pte_mkclean(entry);
+ set_pte_at(vma->vm_mm, address, pte, entry);
+ ret = 1;
+ } else {
+#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE
+ pmd_t *pmd = pvmw.pmd;
+ pmd_t entry;
+
+ if (!pmd_dirty(*pmd) && !pmd_write(*pmd))
+ continue;
+
+ flush_cache_page(vma, address, page_to_pfn(page));
+ entry = pmdp_huge_clear_flush(vma, address, pmd);
+ entry = pmd_wrprotect(entry);
+ entry = pmd_mkclean(entry);
+ set_pmd_at(vma->vm_mm, address, pmd, entry);
+ ret = 1;
+#else
+ /* unexpected pmd-mapped page? */
+ WARN_ON_ONCE(1);
+#endif
+ }
- flush_cache_page(vma, address, pte_pfn(*pte));
- entry = ptep_clear_flush(vma, address, pte);
- entry = pte_wrprotect(entry);
- entry = pte_mkclean(entry);
- set_pte_at(mm, address, pte, entry);
- ret = 1;
+ if (ret) {
+ mmu_notifier_invalidate_page(vma->vm_mm, address);
+ (*cleaned)++;
+ }
}
- pte_unmap_unlock(pte, ptl);
-
- if (ret) {
- mmu_notifier_invalidate_page(mm, address);
- (*cleaned)++;
- }
-out:
return SWAP_AGAIN;
}