From f79f177c25016647cc92ffac8afa7cb96ce47011 Mon Sep 17 00:00:00 2001 From: David Rientjes Date: Sun, 6 May 2007 14:49:22 -0700 Subject: [PATCH] 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 Cc: Paul Mundt Cc: Christoph Lameter Signed-off-by: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/proc/task_mmu.c | 20 +++++++++++++------- 1 file 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; -- 2.30.2