smaps_pte_entry() doesn't ignore zero_huge_page,
but it ignore zero_page, because vm_normal_page() will
ignore it. We remove vm_normal_page() call, because walk_page_range()
have ignore VM_PFNMAP vma maps, it's safe to just use pfn_valid(),
so that we can also consider zero_page to be a valid page.
Another change is that we only add map_count >= 2 or mapcount == 1
pages into pss, because zero_page and huge_zero_page's _mapcount is
zero, this means pss will consider evey zero page as a PAGE_SIZE for
every process, this is not correct for pss statistic. We ignore
zero page for pss, just add zero page into rss statistic.
Signed-off-by: Yalin Wang <yalin.wang@xxxxxxxxxxxxxx>
---
fs/proc/task_mmu.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 4e0388c..ce503d3 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -458,7 +458,9 @@ static void smaps_pte_entry(pte_t ptent, unsigned long addr,
int mapcount;
if (pte_present(ptent)) {
- page = vm_normal_page(vma, addr, ptent);
+ if (!pte_special(ptent) && pfn_valid(pte_pfn(ptent)))
+ page = pfn_to_page(pte_pfn(ptent));
+
} else if (is_swap_pte(ptent)) {
swp_entry_t swpent = pte_to_swp_entry(ptent);
@@ -491,7 +493,7 @@ static void smaps_pte_entry(pte_t ptent, unsigned long addr,
else
mss->shared_clean += ptent_size;
mss->pss += (ptent_size << PSS_SHIFT) / mapcount;
- } else {
+ } else if (mapcount == 1){
if (pte_dirty(ptent) || PageDirty(page))
mss->private_dirty += ptent_size;
else
--
2.1.3
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