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pagemap: rework hugetlb and thp report 

This patch moves pmd dissection out of reporting loop: huge pages are
reported as bunch of normal pages with contiguous PFNs.

Add missing "FILE" bit in hugetlb vmas.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Mark Williamson <mwilliamson@undo-software.com>
Tested-by:  Mark Williamson <mwilliamson@undo-software.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Konstantin Khlebnikov 2015-09-08 15:00:04 -07:00 committed by Linus Torvalds
parent deb945441b
commit 356515e7b6
1 changed files with 45 additions and 57 deletions
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102
fs/proc/task_mmu.c
View File

@ -1040,33 +1040,7 @@ static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
return make_pme(frame, flags);
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static pagemap_entry_t thp_pmd_to_pagemap_entry(struct pagemapread *pm,
pmd_t pmd, int offset, u64 flags)
{
u64 frame = 0;
/*
* Currently pmd for thp is always present because thp can not be
* swapped-out, migrated, or HWPOISONed (split in such cases instead.)
* This if-check is just to prepare for future implementation.
*/
if (pmd_present(pmd)) {
frame = pmd_pfn(pmd) + offset;
flags |= PM_PRESENT;
}
return make_pme(frame, flags);
}
#else
static pagemap_entry_t thp_pmd_to_pagemap_entry(struct pagemapread *pm,
pmd_t pmd, int offset, u64 flags)
{
return make_pme(0, 0);
}
#endif
static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
struct vm_area_struct *vma = walk->vma;
@ -1075,35 +1049,48 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
pte_t *pte, *orig_pte;
int err = 0;
if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
u64 flags = 0;
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
if (pmd_trans_huge_lock(pmdp, vma, &ptl) == 1) {
u64 flags = 0, frame = 0;
pmd_t pmd = *pmdp;
if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(*pmd))
if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(pmd))
flags |= PM_SOFT_DIRTY;
for (; addr != end; addr += PAGE_SIZE) {
unsigned long offset;
pagemap_entry_t pme;
/*
* Currently pmd for thp is always present because thp
* can not be swapped-out, migrated, or HWPOISONed
* (split in such cases instead.)
* This if-check is just to prepare for future implementation.
*/
if (pmd_present(pmd)) {
flags |= PM_PRESENT;
frame = pmd_pfn(pmd) +
((addr & ~PMD_MASK) >> PAGE_SHIFT);
}
for (; addr != end; addr += PAGE_SIZE) {
pagemap_entry_t pme = make_pme(frame, flags);
offset = (addr & ~PAGEMAP_WALK_MASK) >>
PAGE_SHIFT;
pme = thp_pmd_to_pagemap_entry(pm, *pmd, offset, flags);
err = add_to_pagemap(addr, &pme, pm);
if (err)
break;
if (flags & PM_PRESENT)
frame++;
}
spin_unlock(ptl);
return err;
}
if (pmd_trans_unstable(pmd))
if (pmd_trans_unstable(pmdp))
return 0;
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
/*
* We can assume that @vma always points to a valid one and @end never
* goes beyond vma->vm_end.
*/
orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl);
for (; addr < end; pte++, addr += PAGE_SIZE) {
pagemap_entry_t pme;
@ -1120,39 +1107,40 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
}
#ifdef CONFIG_HUGETLB_PAGE
static pagemap_entry_t huge_pte_to_pagemap_entry(struct pagemapread *pm,
pte_t pte, int offset, u64 flags)
{
u64 frame = 0;
if (pte_present(pte)) {
frame = pte_pfn(pte) + offset;
flags |= PM_PRESENT;
}
return make_pme(frame, flags);
}
/* This function walks within one hugetlb entry in the single call */
static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
struct pagemapread *pm = walk->private;
struct vm_area_struct *vma = walk->vma;
u64 flags = 0, frame = 0;
int err = 0;
u64 flags = 0;
pagemap_entry_t pme;
pte_t pte;
if (vma->vm_flags & VM_SOFTDIRTY)
flags |= PM_SOFT_DIRTY;
pte = huge_ptep_get(ptep);
if (pte_present(pte)) {
struct page *page = pte_page(pte);
if (!PageAnon(page))
flags |= PM_FILE;
flags |= PM_PRESENT;
frame = pte_pfn(pte) +
((addr & ~hmask) >> PAGE_SHIFT);
}
for (; addr != end; addr += PAGE_SIZE) {
int offset = (addr & ~hmask) >> PAGE_SHIFT;
pme = huge_pte_to_pagemap_entry(pm, *pte, offset, flags);
pagemap_entry_t pme = make_pme(frame, flags);
err = add_to_pagemap(addr, &pme, pm);
if (err)
return err;
if (flags & PM_PRESENT)
frame++;
}
cond_resched();
@ -1216,7 +1204,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
if (!pm.buffer)
goto out_mm;
pagemap_walk.pmd_entry = pagemap_pte_range;
pagemap_walk.pmd_entry = pagemap_pmd_range;
pagemap_walk.pte_hole = pagemap_pte_hole;
#ifdef CONFIG_HUGETLB_PAGE
pagemap_walk.hugetlb_entry = pagemap_hugetlb_range;