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mm/pagewalk: remove pgd_entry() and pud_entry()

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Currently no user of page table walker sets ->pgd_entry() or
->pud_entry(), so checking their existence in each loop is just wasting
CPU cycle.  So let's remove it to reduce overhead.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Naoya Horiguchi 2015-02-11 15:27:34 -08:00 • committed by Linus Torvalds
parent 05fbf357d9
commit 0b1fbfe500
2 changed files with 2 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
include/linux/mm.h
View file

@ -1164,8 +1164,6 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
/** /**
* mm_walk - callbacks for walk_page_range * mm_walk - callbacks for walk_page_range
* @pgd_entry: if set, called for each non-empty PGD (top-level) entry
* @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
* @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
* this handler is required to be able to handle * this handler is required to be able to handle
* pmd_trans_huge() pmds. They may simply choose to * pmd_trans_huge() pmds. They may simply choose to
@ -1179,10 +1177,6 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
* (see walk_page_range for more details) * (see walk_page_range for more details)
*/ */
struct mm_walk { struct mm_walk {
int (*pgd_entry)(pgd_t *pgd, unsigned long addr,
unsigned long next, struct mm_walk *walk);
int (*pud_entry)(pud_t *pud, unsigned long addr,
unsigned long next, struct mm_walk *walk);
int (*pmd_entry)(pmd_t *pmd, unsigned long addr, int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
unsigned long next, struct mm_walk *walk); unsigned long next, struct mm_walk *walk);
int (*pte_entry)(pte_t *pte, unsigned long addr, int (*pte_entry)(pte_t *pte, unsigned long addr,

9
mm/pagewalk.c
View file

@ -86,9 +86,7 @@ static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end,
break; break;
continue; continue;
} }
if (walk->pud_entry) if (walk->pmd_entry || walk->pte_entry)
err = walk->pud_entry(pud, addr, next, walk);
if (!err && (walk->pmd_entry || walk->pte_entry))
err = walk_pmd_range(pud, addr, next, walk); err = walk_pmd_range(pud, addr, next, walk);
if (err) if (err)
break; break;
@ -237,10 +235,7 @@ int walk_page_range(unsigned long addr, unsigned long end,
pgd++; pgd++;
continue; continue;
} }
if (walk->pgd_entry) if (walk->pmd_entry || walk->pte_entry)
err = walk->pgd_entry(pgd, addr, next, walk);
if (!err &&
(walk->pud_entry || walk->pmd_entry || walk->pte_entry))
err = walk_pud_range(pgd, addr, next, walk); err = walk_pud_range(pgd, addr, next, walk);
if (err) if (err)
break; break;