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SubjectRe: 2.6.15-rc4 panic in __nr_to_section() with CONFIG_SPARSEMEM
From
Date
On Thu, 2005-12-08 at 08:07 -0800, Badari Pulavarty wrote:
> No. It doesn't help. It looks like ppc pmd_huge() always returns 0.
> Don't know why ? :(

The ppc64 hugetlb pages don't line up on PMD boundaries like they do on
i386. The entries are stored in regular old PTEs.

I really don't like coding the two different hugetlb cases, but I can't
think of a better way to do it. Anyone care to test on ppc64?

-- Dave

proc-dups-dave/fs/proc/task_mmu.c | 53 +++++++++++++++++++++++++++-----------
1 files changed, 39 insertions(+), 14 deletions(-)
diff -puN fs/proc/task_mmu.c~task_mmu_fix fs/proc/task_mmu.c
--- proc-dups/fs/proc/task_mmu.c~task_mmu_fix 2005-12-07 16:34:38.000000000 -0800
+++ proc-dups-dave/fs/proc/task_mmu.c 2005-12-08 11:14:09.000000000 -0800
@@ -198,6 +198,24 @@ static int show_map(struct seq_file *m,
return show_map_internal(m, v, NULL);
}

+static void smaps_account_for_page(pte_t ptent, struct page *page,
+ unsigned long page_size,
+ struct mem_size_stats *mss)
+{
+ mss->resident += page_size;
+ if (page_count(page) >= 2) {
+ if (pte_dirty(ptent))
+ mss->shared_dirty += page_size;
+ else
+ mss->shared_clean += page_size;
+ } else {
+ if (pte_dirty(ptent))
+ mss->private_dirty += page_size;
+ else
+ mss->private_clean += page_size;
+ }
+}
+
static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end,
struct mem_size_stats *mss)
@@ -205,32 +223,38 @@ static void smaps_pte_range(struct vm_ar
pte_t *pte, ptent;
spinlock_t *ptl;
unsigned long pfn;
+ unsigned long page_size;
struct page *page;

+ if (pmd_huge(*pmd)) {
+ struct page *page;
+
+ page = follow_huge_pmd(vma->vm_mm, addr, pmd, 0);
+ if (!page)
+ return;
+
+ ptent = *(pte_t *)pmd;
+ smaps_account_for_page(ptent, page, HPAGE_SIZE, mss);
+ return;
+ }
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
do {
ptent = *pte;
if (!pte_present(ptent))
continue;

- mss->resident += PAGE_SIZE;
+ page_size = PAGE_SIZE;
+ if (is_hugepage_only_range(vma->vm_mm, addr, end - addr))
+ page_size = HPAGE_SIZE;
+
+ mss->resident += page_size;
pfn = pte_pfn(ptent);
if (!pfn_valid(pfn))
continue;

page = pfn_to_page(pfn);
- if (page_count(page) >= 2) {
- if (pte_dirty(ptent))
- mss->shared_dirty += PAGE_SIZE;
- else
- mss->shared_clean += PAGE_SIZE;
- } else {
- if (pte_dirty(ptent))
- mss->private_dirty += PAGE_SIZE;
- else
- mss->private_clean += PAGE_SIZE;
- }
- } while (pte++, addr += PAGE_SIZE, addr != end);
+ smaps_account_for_page(ptent, page, page_size, mss);
+ } while (pte++, addr += page_size, addr != end);
pte_unmap_unlock(pte - 1, ptl);
cond_resched();
}
@@ -245,7 +269,8 @@ static inline void smaps_pmd_range(struc
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
- if (pmd_none_or_clear_bad(pmd))
+
+ if (!pmd_huge(*pmd) && pmd_none_or_clear_bad(pmd))
continue;
smaps_pte_range(vma, pmd, addr, next, mss);
} while (pmd++, addr = next, addr != end);
_

-
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