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mm: convert remove_migration_pte() to use page_vma_mapped_walk() 

remove_migration_pte() also can easily be converted to
page_vma_mapped_walk().

[akpm@linux-foundation.org: coding-style fixes]
Link: http://lkml.kernel.org/r/20170129173858.45174-13-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>
zero-colors
Kirill A. Shutemov 2017-02-24 14:58:16 -08:00 committed by Linus Torvalds
parent d53a8b49a6
commit 3fe87967c5
1 changed files with 41 additions and 61 deletions
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102
mm/migrate.c
View File

@ -193,82 +193,62 @@ void putback_movable_pages(struct list_head *l)
/*
* Restore a potential migration pte to a working pte entry
*/
static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
static int remove_migration_pte(struct page *page, struct vm_area_struct *vma,
unsigned long addr, void *old)
{
struct mm_struct *mm = vma->vm_mm;
struct page_vma_mapped_walk pvmw = {
.page = old,
.vma = vma,
.address = addr,
.flags = PVMW_SYNC | PVMW_MIGRATION,
};
struct page *new;
pte_t pte;
swp_entry_t entry;
pmd_t *pmd;
pte_t *ptep, pte;
spinlock_t *ptl;
if (unlikely(PageHuge(new))) {
ptep = huge_pte_offset(mm, addr);
if (!ptep)
goto out;
ptl = huge_pte_lockptr(hstate_vma(vma), mm, ptep);
} else {
pmd = mm_find_pmd(mm, addr);
if (!pmd)
goto out;
VM_BUG_ON_PAGE(PageTail(page), page);
while (page_vma_mapped_walk(&pvmw)) {
new = page - pvmw.page->index +
linear_page_index(vma, pvmw.address);
ptep = pte_offset_map(pmd, addr);
get_page(new);
pte = pte_mkold(mk_pte(new, READ_ONCE(vma->vm_page_prot)));
if (pte_swp_soft_dirty(*pvmw.pte))
pte = pte_mksoft_dirty(pte);
/*
* Peek to check is_swap_pte() before taking ptlock? No, we
* can race mremap's move_ptes(), which skips anon_vma lock.
* Recheck VMA as permissions can change since migration started
*/
ptl = pte_lockptr(mm, pmd);
}
spin_lock(ptl);
pte = *ptep;
if (!is_swap_pte(pte))
goto unlock;
entry = pte_to_swp_entry(pte);
if (!is_migration_entry(entry) ||
migration_entry_to_page(entry) != old)
goto unlock;
get_page(new);
pte = pte_mkold(mk_pte(new, READ_ONCE(vma->vm_page_prot)));
if (pte_swp_soft_dirty(*ptep))
pte = pte_mksoft_dirty(pte);
/* Recheck VMA as permissions can change since migration started */
if (is_write_migration_entry(entry))
pte = maybe_mkwrite(pte, vma);
entry = pte_to_swp_entry(*pvmw.pte);
if (is_write_migration_entry(entry))
pte = maybe_mkwrite(pte, vma);
#ifdef CONFIG_HUGETLB_PAGE
if (PageHuge(new)) {
pte = pte_mkhuge(pte);
pte = arch_make_huge_pte(pte, vma, new, 0);
}
if (PageHuge(new)) {
pte = pte_mkhuge(pte);
pte = arch_make_huge_pte(pte, vma, new, 0);
}
#endif
flush_dcache_page(new);
set_pte_at(mm, addr, ptep, pte);
flush_dcache_page(new);
set_pte_at(vma->vm_mm, pvmw.address, pvmw.pte, pte);
if (PageHuge(new)) {
if (PageAnon(new))
hugepage_add_anon_rmap(new, vma, addr);
if (PageHuge(new)) {
if (PageAnon(new))
hugepage_add_anon_rmap(new, vma, pvmw.address);
else
page_dup_rmap(new, true);
} else if (PageAnon(new))
page_add_anon_rmap(new, vma, pvmw.address, false);
else
page_dup_rmap(new, true);
} else if (PageAnon(new))
page_add_anon_rmap(new, vma, addr, false);
else
page_add_file_rmap(new, false);
page_add_file_rmap(new, false);
if (vma->vm_flags & VM_LOCKED && !PageTransCompound(new))
mlock_vma_page(new);
if (vma->vm_flags & VM_LOCKED && !PageTransCompound(new))
mlock_vma_page(new);
/* No need to invalidate - it was non-present before */
update_mmu_cache(vma, pvmw.address, pvmw.pte);
}
/* No need to invalidate - it was non-present before */
update_mmu_cache(vma, addr, ptep);
unlock:
pte_unmap_unlock(ptep, ptl);
out:
return SWAP_AGAIN;
}