Adds an additional unsigned long field to struct mem_size_stats:
referenced. For each page table entry that is walked for the VMA in the
smaps code, this field is incremented if PG_referenced is set.
An additional line was added to the /proc/pid/smaps output for each VMA
to indicate how many pages within it are currently marked as accessed
(referenced).
Cc: Hugh Dickins <[email protected]>
Cc: Paul Mundt <[email protected]>
Cc: Christoph Lameter <[email protected]>
Signed-off-by: David Rientjes <[email protected]>
---
fs/proc/task_mmu.c | 20 +++++++++++++-------
1 files changed, 13 insertions(+), 7 deletions(-)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index e87824b..a1f5e87 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -120,6 +120,7 @@ struct mem_size_stats
unsigned long shared_dirty;
unsigned long private_clean;
unsigned long private_dirty;
+ unsigned long referenced;
};
struct pte_walker {
@@ -190,18 +191,20 @@ static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats
if (mss)
seq_printf(m,
- "Size: %8lu kB\n"
- "Rss: %8lu kB\n"
- "Shared_Clean: %8lu kB\n"
- "Shared_Dirty: %8lu kB\n"
- "Private_Clean: %8lu kB\n"
- "Private_Dirty: %8lu kB\n",
+ "Size: %8lu kB\n"
+ "Rss: %8lu kB\n"
+ "Shared_Clean: %8lu kB\n"
+ "Shared_Dirty: %8lu kB\n"
+ "Private_Clean: %8lu kB\n"
+ "Private_Dirty: %8lu kB\n"
+ "Pgs_Referenced: %8li\n",
(vma->vm_end - vma->vm_start) >> 10,
mss->resident >> 10,
mss->shared_clean >> 10,
mss->shared_dirty >> 10,
mss->private_clean >> 10,
- mss->private_dirty >> 10);
+ mss->private_dirty >> 10,
+ mss->referenced);
if (m->count < m->size) /* vma is copied successfully */
m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;
@@ -302,6 +305,9 @@ static void smaps_pte_func(struct pte_walker *walker, pte_t *pte,
if (!page)
return;
+ /* Accumulate the number of pages that have been accessed. */
+ if (PageReferenced(page))
+ mss->referenced++;
if (page_mapcount(page) >= 2) {
if (pte_dirty(ptent))
mss->shared_dirty += PAGE_SIZE;
-
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