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authorDavid Rientjes <rientjes@google.com>2007-05-06 14:49:22 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 12:12:52 -0700
commitf79f177c25016647cc92ffac8afa7cb96ce47011 (patch)
treeb613be041a467fd3ffaed7ad89d8694ede780dfa /fs
parent826fad1b93fdb4ffacfd9cd860f06140e852e377 (diff)
smaps: add pages referenced count to smaps
Adds an additional unsigned long field to struct mem_size_stats called 'referenced'. For each pte walked in the smaps code, this field is incremented by PAGE_SIZE if it has pte-reference bits. 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 referenced or accessed. Cc: Hugh Dickins <hugh@veritas.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Christoph Lameter <clameter@sgi.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/proc/task_mmu.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 9d22c1c1caa8..199088ee969b 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 pmd_walker {
@@ -188,18 +189,20 @@ 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: %8lu kB\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 >> 10);
if (m->count < m->size) /* vma is copied successfully */
m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;
@@ -232,6 +235,9 @@ static void smaps_one_pmd(struct vm_area_struct *vma, pmd_t *pmd,
if (!page)
continue;
+ /* Accumulate the size in pages that have been accessed. */
+ if (pte_young(ptent) || PageReferenced(page))
+ mss->referenced += PAGE_SIZE;
if (page_mapcount(page) >= 2) {
if (pte_dirty(ptent))
mss->shared_dirty += PAGE_SIZE;