Revert "mm: make faultaround produce old ptes"

This reverts commit 5c0a85fad949212b3e059692deecdeed74ae7ec7.

The commit causes ~6% regression in unixbench.

Let's revert it for now and consider other solution for reclaim problem
later.

Link: http://lkml.kernel.org/r/1465893750-44080-2-git-send-email-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Vinayak Menon <vinmenon@codeaurora.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 18 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 15322b73636b..61fe7e7b56bf 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2877,7 +2877,7 @@ static int __do_fault(struct vm_area_struct *vma, unsigned long address,
  * vm_ops->map_pages.
  */
 void do_set_pte(struct vm_area_struct *vma, unsigned long address,
-                struct page *page, pte_t *pte, bool write, bool anon, bool old)
+                struct page *page, pte_t *pte, bool write, bool anon)
 {
         pte_t entry;
 
@@ -2885,8 +2885,6 @@ void do_set_pte(struct vm_area_struct *vma, unsigned long address,
         entry = mk_pte(page, vma->vm_page_prot);
         if (write)
                 entry = maybe_mkwrite(pte_mkdirty(entry), vma);
-        if (old)
-                entry = pte_mkold(entry);
         if (anon) {
                 inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
                 page_add_new_anon_rmap(page, vma, address, false);
@@ -3032,20 +3030,9 @@ static int do_read_fault(struct mm_struct *mm, struct vm_area_struct *vma,
          */
         if (vma->vm_ops->map_pages && fault_around_bytes >> PAGE_SHIFT > 1) {
                 pte = pte_offset_map_lock(mm, pmd, address, &ptl);
-                if (!pte_same(*pte, orig_pte))
-                        goto unlock_out;
                 do_fault_around(vma, address, pte, pgoff, flags);
-                /* Check if the fault is handled by faultaround */
-                if (!pte_same(*pte, orig_pte)) {
-                        /*
-                         * Faultaround produce old pte, but the pte we've
-                         * handler fault for should be young.
-                         */
-                        pte_t entry = pte_mkyoung(*pte);
-                        if (ptep_set_access_flags(vma, address, pte, entry, 0))
-                                update_mmu_cache(vma, address, pte);
+                if (!pte_same(*pte, orig_pte))
                         goto unlock_out;
-                }
                 pte_unmap_unlock(pte, ptl);
         }
 
@@ -3060,7 +3047,7 @@ static int do_read_fault(struct mm_struct *mm, struct vm_area_struct *vma,
                 put_page(fault_page);
                 return ret;
         }
-        do_set_pte(vma, address, fault_page, pte, false, false, false);
+        do_set_pte(vma, address, fault_page, pte, false, false);
         unlock_page(fault_page);
 unlock_out:
         pte_unmap_unlock(pte, ptl);
@@ -3111,7 +3098,7 @@ static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma,
                 }
                 goto uncharge_out;
         }
-        do_set_pte(vma, address, new_page, pte, true, true, false);
+        do_set_pte(vma, address, new_page, pte, true, true);
         mem_cgroup_commit_charge(new_page, memcg, false, false);
         lru_cache_add_active_or_unevictable(new_page, vma);
         pte_unmap_unlock(pte, ptl);
@@ -3164,7 +3151,7 @@ static int do_shared_fault(struct mm_struct *mm, struct vm_area_struct *vma,
                 put_page(fault_page);
                 return ret;
         }
-        do_set_pte(vma, address, fault_page, pte, true, false, false);
+        do_set_pte(vma, address, fault_page, pte, true, false);
         pte_unmap_unlock(pte, ptl);
 
         if (set_page_dirty(fault_page))