This patch change smaps pagetable walk behavior, to make
sure not skip VM_PFNMAP pagetables,
so that we can calculate COW pages of VM_PFNMAP as normal pages.
Signed-off-by: Yalin Wang <yalin.w...@sonymobile.com>
---
fs/proc/task_mmu.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index c7267e9..00a5b73 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -503,6 +503,15 @@ static void smaps_pte_entry(pte_t *pte, unsigned long addr,
smaps_account(mss, page, PAGE_SIZE, pte_young(*pte), pte_dirty(*pte));
}
+static int smaps_test_walk(unsigned long addr, unsigned long next,
+ struct mm_walk *walk)
+{
+ /*
+ * don't skip VM_PFNMAP, so that we can caculate some COW pages.
+ */
+ return 0;
+}
+
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
struct mm_walk *walk)
@@ -616,6 +625,7 @@ static int show_smap(struct seq_file *m, void *v, int
is_pid)
struct mem_size_stats mss;
struct mm_walk smaps_walk = {
.pmd_entry = smaps_pte_range,
+ .test_walk = smaps_test_walk,
.mm = vma->vm_mm,
.private = &mss,
};
--
2.2.2
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