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Date: Sun, 15 May 2011 18:20:22 -0400
From: Stephen Wilson <wilsons@...rt.ca>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Stephen Wilson <wilsons@...rt.ca>,
Hugh Dickins <hughd@...gle.com>,
David Rientjes <rientjes@...gle.com>,
Lee Schermerhorn <lee.schermerhorn@...com>,
Alexey Dobriyan <adobriyan@...il.com>,
Christoph Lameter <cl@...ux-foundation.org>
Subject: [PATCH v2 2/9] mm: use walk_page_range() instead of custom page table walking code
Converting show_numa_map() to use the generic routine decouples
the function from mempolicy.c, allowing it to be moved out of the mm
subsystem and into fs/proc.
Also, include KSM pages in /proc/pid/numa_maps statistics. The pagewalk
logic implemented by check_pte_range() failed to account for such pages
as they were not applicable to the page migration case.
Signed-off-by: Stephen Wilson <wilsons@...rt.ca>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Lee Schermerhorn <lee.schermerhorn@...com>
Cc: Alexey Dobriyan <adobriyan@...il.com>
Cc: Christoph Lameter <cl@...ux-foundation.org>
---
mm/mempolicy.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++-----
1 files changed, 68 insertions(+), 7 deletions(-)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 6cc997d..c894671 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2547,6 +2547,7 @@ int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol, int no_context)
}
struct numa_maps {
+ struct vm_area_struct *vma;
unsigned long pages;
unsigned long anon;
unsigned long active;
@@ -2584,6 +2585,41 @@ static void gather_stats(struct page *page, void *private, int pte_dirty)
md->node[page_to_nid(page)]++;
}
+static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
+ unsigned long end, struct mm_walk *walk)
+{
+ struct numa_maps *md;
+ spinlock_t *ptl;
+ pte_t *orig_pte;
+ pte_t *pte;
+
+ md = walk->private;
+ orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
+ do {
+ struct page *page;
+ int nid;
+
+ if (!pte_present(*pte))
+ continue;
+
+ page = vm_normal_page(md->vma, addr, *pte);
+ if (!page)
+ continue;
+
+ if (PageReserved(page))
+ continue;
+
+ nid = page_to_nid(page);
+ if (!node_isset(nid, node_states[N_HIGH_MEMORY]))
+ continue;
+
+ gather_stats(page, md, pte_dirty(*pte));
+
+ } while (pte++, addr += PAGE_SIZE, addr != end);
+ pte_unmap_unlock(orig_pte, ptl);
+ return 0;
+}
+
#ifdef CONFIG_HUGETLB_PAGE
static void check_huge_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end,
@@ -2613,12 +2649,35 @@ static void check_huge_range(struct vm_area_struct *vma,
gather_stats(page, md, pte_dirty(*ptep));
}
}
+
+static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
+ unsigned long addr, unsigned long end, struct mm_walk *walk)
+{
+ struct page *page;
+
+ if (pte_none(*pte))
+ return 0;
+
+ page = pte_page(*pte);
+ if (!page)
+ return 0;
+
+ gather_stats(page, walk->private, pte_dirty(*pte));
+ return 0;
+}
+
#else
static inline void check_huge_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end,
struct numa_maps *md)
{
}
+
+static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
+ unsigned long addr, unsigned long end, struct mm_walk *walk)
+{
+ return 0;
+}
#endif
/*
@@ -2631,6 +2690,7 @@ int show_numa_map(struct seq_file *m, void *v)
struct numa_maps *md;
struct file *file = vma->vm_file;
struct mm_struct *mm = vma->vm_mm;
+ struct mm_walk walk = {};
struct mempolicy *pol;
int n;
char buffer[50];
@@ -2642,6 +2702,13 @@ int show_numa_map(struct seq_file *m, void *v)
if (!md)
return 0;
+ md->vma = vma;
+
+ walk.hugetlb_entry = gather_hugetbl_stats;
+ walk.pmd_entry = gather_pte_stats;
+ walk.private = md;
+ walk.mm = mm;
+
pol = get_vma_policy(priv->task, vma, vma->vm_start);
mpol_to_str(buffer, sizeof(buffer), pol, 0);
mpol_cond_put(pol);
@@ -2658,13 +2725,7 @@ int show_numa_map(struct seq_file *m, void *v)
seq_printf(m, " stack");
}
- if (is_vm_hugetlb_page(vma)) {
- check_huge_range(vma, vma->vm_start, vma->vm_end, md);
- seq_printf(m, " huge");
- } else {
- check_pgd_range(vma, vma->vm_start, vma->vm_end,
- &node_states[N_HIGH_MEMORY], MPOL_MF_STATS, md);
- }
+ walk_page_range(vma->vm_start, vma->vm_end, &walk);
if (!md->pages)
goto out;
--
1.7.4.4
--
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