openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

mincore: pass ranges as start,end address pairs 

Instead of passing a start address and a number of pages into the helper
functions, convert them to use a start and an end address.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2010-05-24 14:32:11 -07:00 committed by Linus Torvalds
parent f488401076
commit 25ef0e50cc
1 changed files with 27 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
mm/mincore.c
View File

@ -20,14 +20,12 @@
#include <asm/pgtable.h>
static void mincore_hugetlb_page_range(struct vm_area_struct *vma,
unsigned long addr, unsigned long nr,
unsigned long addr, unsigned long end,
unsigned char *vec)
{
#ifdef CONFIG_HUGETLB_PAGE
struct hstate *h;
int i;
i = 0;
h = hstate_vma(vma);
while (1) {
unsigned char present;
@ -40,10 +38,10 @@ static void mincore_hugetlb_page_range(struct vm_area_struct *vma,
addr & huge_page_mask(h));
present = ptep && !huge_pte_none(huge_ptep_get(ptep));
while (1) {
vec[i++] = present;
*vec = present;
vec++;
addr += PAGE_SIZE;
/* reach buffer limit */
if (i == nr)
if (addr == end)
return;
/* check hugepage border */
if (!(addr & ~huge_page_mask(h)))
@ -86,9 +84,10 @@ static unsigned char mincore_page(struct address_space *mapping, pgoff_t pgoff)
}
static void mincore_unmapped_range(struct vm_area_struct *vma,
unsigned long addr, unsigned long nr,
unsigned long addr, unsigned long end,
unsigned char *vec)
{
unsigned long nr = (end - addr) >> PAGE_SHIFT;
int i;
if (vma->vm_file) {
@ -104,42 +103,44 @@ static void mincore_unmapped_range(struct vm_area_struct *vma,
}
static void mincore_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long nr,
unsigned long addr, unsigned long end,
unsigned char *vec)
{
unsigned long next;
spinlock_t *ptl;
pte_t *ptep;
int i;
ptep = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
for (i = 0; i < nr; i++, ptep++, addr += PAGE_SIZE) {
do {
pte_t pte = *ptep;
pgoff_t pgoff;
next = addr + PAGE_SIZE;
if (pte_none(pte))
mincore_unmapped_range(vma, addr, 1, vec);
mincore_unmapped_range(vma, addr, next, vec);
else if (pte_present(pte))
vec[i] = 1;
*vec = 1;
else if (pte_file(pte)) {
pgoff = pte_to_pgoff(pte);
vec[i] = mincore_page(vma->vm_file->f_mapping, pgoff);
*vec = mincore_page(vma->vm_file->f_mapping, pgoff);
} else { /* pte is a swap entry */
swp_entry_t entry = pte_to_swp_entry(pte);
if (is_migration_entry(entry)) {
/* migration entries are always uptodate */
vec[i] = 1;
*vec = 1;
} else {
#ifdef CONFIG_SWAP
pgoff = entry.val;
vec[i] = mincore_page(&swapper_space, pgoff);
*vec = mincore_page(&swapper_space, pgoff);
#else
WARN_ON(1);
vec[i] = 1;
*vec = 1;
#endif
}
}
}
vec++;
} while (ptep++, addr = next, addr != end);
pte_unmap_unlock(ptep - 1, ptl);
}
@ -153,25 +154,21 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
unsigned long nr;
struct vm_area_struct *vma;
unsigned long end;
vma = find_vma(current->mm, addr);
if (!vma || addr < vma->vm_start)
return -ENOMEM;
nr = min(pages, (vma->vm_end - addr) >> PAGE_SHIFT);
end = min(vma->vm_end, addr + (pages << PAGE_SHIFT));
if (is_vm_hugetlb_page(vma)) {
mincore_hugetlb_page_range(vma, addr, nr, vec);
return nr;
mincore_hugetlb_page_range(vma, addr, end, vec);
return (end - addr) >> PAGE_SHIFT;
}
/*
* Calculate how many pages there are left in the last level of the
* PTE array for our address.
*/
nr = min(nr, PTRS_PER_PTE - ((addr >> PAGE_SHIFT) & (PTRS_PER_PTE-1)));
end = pmd_addr_end(addr, end);
pgd = pgd_offset(vma->vm_mm, addr);
if (pgd_none_or_clear_bad(pgd))
@ -183,12 +180,12 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
if (pmd_none_or_clear_bad(pmd))
goto none_mapped;
mincore_pte_range(vma, pmd, addr, nr, vec);
return nr;
mincore_pte_range(vma, pmd, addr, end, vec);
return (end - addr) >> PAGE_SHIFT;
none_mapped:
mincore_unmapped_range(vma, addr, nr, vec);
return nr;
mincore_unmapped_range(vma, addr, end, vec);
return (end - addr) >> PAGE_SHIFT;
}
/*