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authorDave Hansen <dave@linux.vnet.ibm.com>2011-09-20 15:19:39 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-09-21 13:15:44 -0700
commit3200a8aaab0c9ccdc0f59b0dac2d4a47029137fa (patch)
tree33ba986eab9d2663b44082c73114e2599cd06537
parenteb4866d0066ffd5446751c102d64feb3318d8bd1 (diff)
break out numa_maps gather_pte_stats() checks
gather_pte_stats() does a number of checks on a target page to see whether it should even be considered for statistics. This breaks that code out in to a separate function so that we can use it in the transparent hugepage case in the next patch. Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> Acked-by: Hugh Dickins <hughd@google.com> Reviewed-by: Christoph Lameter <cl@gentwo.org> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/proc/task_mmu.c39
1 files changed, 24 insertions, 15 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 61342a454bd9..9dca07e0758d 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -904,6 +904,29 @@ static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
md->node[page_to_nid(page)] += nr_pages;
}
+static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
+ unsigned long addr)
+{
+ struct page *page;
+ int nid;
+
+ if (!pte_present(pte))
+ return NULL;
+
+ page = vm_normal_page(vma, addr, pte);
+ if (!page)
+ return NULL;
+
+ if (PageReserved(page))
+ return NULL;
+
+ nid = page_to_nid(page);
+ if (!node_isset(nid, node_states[N_HIGH_MEMORY]))
+ return NULL;
+
+ return page;
+}
+
static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
unsigned long end, struct mm_walk *walk)
{
@@ -915,23 +938,9 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
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);
+ struct page *page = can_gather_numa_stats(*pte, md->vma, addr);
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), 1);
} while (pte++, addr += PAGE_SIZE, addr != end);