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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2016-05-20 16:58:41 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-20 17:58:30 -0700
commit5c0a85fad949212b3e059692deecdeed74ae7ec7 (patch)
treeb6fa0d070d4cb85fcf0e6d578edbc074e999dbe9
parent4b50bcc7eda4d3cc9e3f2a0aa60e590fedf728c5 (diff)
downloadop-kernel-dev-5c0a85fad949212b3e059692deecdeed74ae7ec7.zip
op-kernel-dev-5c0a85fad949212b3e059692deecdeed74ae7ec7.tar.gz
mm: make faultaround produce old ptes
Currently, faultaround code produces young pte. This can screw up vmscan behaviour[1], as it makes vmscan think that these pages are hot and not push them out on first round. During sparse file access faultaround gets more pages mapped and all of them are young. Under memory pressure, this makes vmscan swap out anon pages instead, or to drop other page cache pages which otherwise stay resident. Modify faultaround to produce old ptes, so they can easily be reclaimed under memory pressure. This can to some extend defeat the purpose of faultaround on machines without hardware accessed bit as it will not help us with reducing the number of minor page faults. We may want to disable faultaround on such machines altogether, but that's subject for separate patchset. Minchan: "I tested 512M mmap sequential word read test on non-HW access bit system (i.e., ARM) and confirmed it doesn't increase minor fault any more. old: 4096 fault_around minor fault: 131291 elapsed time: 6747645 usec new: 65536 fault_around minor fault: 131291 elapsed time: 6709263 usec 0.56% benefit" [1] https://lkml.kernel.org/r/1460992636-711-1-git-send-email-vinmenon@codeaurora.org Link: http://lkml.kernel.org/r/1463488366-47723-1-git-send-email-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Minchan Kim <minchan@kernel.org> Tested-by: Minchan Kim <minchan@kernel.org> Acked-by: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vinayak Menon <vinmenon@codeaurora.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/mm.h2
-rw-r--r--mm/filemap.c2
-rw-r--r--mm/memory.c23
3 files changed, 20 insertions, 7 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index fbdb9d4..f223ac2 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -596,7 +596,7 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
}
void do_set_pte(struct vm_area_struct *vma, unsigned long address,
- struct page *page, pte_t *pte, bool write, bool anon);
+ struct page *page, pte_t *pte, bool write, bool anon, bool old);
#endif
/*
diff --git a/mm/filemap.c b/mm/filemap.c
index 8f48599..b418405 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2191,7 +2191,7 @@ repeat:
if (file->f_ra.mmap_miss > 0)
file->f_ra.mmap_miss--;
addr = address + (page->index - vmf->pgoff) * PAGE_SIZE;
- do_set_pte(vma, addr, page, pte, false, false);
+ do_set_pte(vma, addr, page, pte, false, false, true);
unlock_page(page);
goto next;
unlock:
diff --git a/mm/memory.c b/mm/memory.c
index 007c72a..f29e5ab 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2876,7 +2876,7 @@ 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)
+ struct page *page, pte_t *pte, bool write, bool anon, bool old)
{
pte_t entry;
@@ -2884,6 +2884,8 @@ 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);
@@ -3021,9 +3023,20 @@ 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);
- do_fault_around(vma, address, pte, pgoff, flags);
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);
+ goto unlock_out;
+ }
pte_unmap_unlock(pte, ptl);
}
@@ -3038,7 +3051,7 @@ 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);
+ do_set_pte(vma, address, fault_page, pte, false, false, false);
unlock_page(fault_page);
unlock_out:
pte_unmap_unlock(pte, ptl);
@@ -3090,7 +3103,7 @@ 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);
+ do_set_pte(vma, address, new_page, pte, true, true, false);
mem_cgroup_commit_charge(new_page, memcg, false, false);
lru_cache_add_active_or_unevictable(new_page, vma);
pte_unmap_unlock(pte, ptl);
@@ -3147,7 +3160,7 @@ 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);
+ do_set_pte(vma, address, fault_page, pte, true, false, false);
pte_unmap_unlock(pte, ptl);
if (set_page_dirty(fault_page))
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