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smaps: add pages referenced count to smaps

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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>
This commit is contained in:
David Rientjes
2007-05-06 14:49:22 -07:00
committed by Linus Torvalds
parent 826fad1b93
commit f79f177c25
1 changed files with 13 additions and 7 deletions
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20
fs/proc/task_mmu.c
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@@ -120,6 +120,7 @@ struct mem_size_stats
unsigned long shared_dirty; unsigned long shared_dirty;
unsigned long private_clean; unsigned long private_clean;
unsigned long private_dirty; unsigned long private_dirty;
unsigned long referenced;
}; };
struct pmd_walker { struct pmd_walker {
@@ -188,18 +189,20 @@ static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats
if (mss) if (mss)
seq_printf(m, seq_printf(m,
"Size: %8lu kB\n" "Size: %8lu kB\n"
"Rss: %8lu kB\n" "Rss: %8lu kB\n"
"Shared_Clean: %8lu kB\n" "Shared_Clean: %8lu kB\n"
"Shared_Dirty: %8lu kB\n" "Shared_Dirty: %8lu kB\n"
"Private_Clean: %8lu kB\n" "Private_Clean: %8lu kB\n"
"Private_Dirty: %8lu kB\n", "Private_Dirty: %8lu kB\n"
"Pgs_Referenced: %8lu kB\n",
(vma->vm_end - vma->vm_start) >> 10, (vma->vm_end - vma->vm_start) >> 10,
mss->resident >> 10, mss->resident >> 10,
mss->shared_clean >> 10, mss->shared_clean >> 10,
mss->shared_dirty >> 10, mss->shared_dirty >> 10,
mss->private_clean >> 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 */ if (m->count < m->size) /* vma is copied successfully */
m->version = (vma != get_gate_vma(task))? vma->vm_start: 0; 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) if (!page)
continue; 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 (page_mapcount(page) >= 2) {
if (pte_dirty(ptent)) if (pte_dirty(ptent))
mss->shared_dirty += PAGE_SIZE; mss->shared_dirty += PAGE_SIZE;