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From: David Rientjes <rientjes@google.com>
To: Andrew Morton <akpm@osdl.org>
Cc: Hugh Dickins <hugh@veritas.com>, Paul Mundt <lethal@linux-sh.org>,
	Christoph Lameter <clameter@sgi.com>,
	linux-kernel@vger.kernel.org
Subject: [patch 2/3] smaps: add pages referenced count to smaps
Date: Tue, 6 Feb 2007 21:27:03 -0800 (PST)	[thread overview]
Message-ID: <Pine.LNX.4.64.0702062122540.8623@chino.kir.corp.google.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0702062121160.8623@chino.kir.corp.google.com>

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 <hugh@veritas.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Christoph Lameter <clameter@sgi.com>
Signed-off-by: David Rientjes <rientjes@google.com>
---
 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;

  reply	other threads:[~2007-02-07  5:27 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-07  5:26 [patch 1/3] smaps: extract pte walker from smaps code David Rientjes
2007-02-07  5:27 ` David Rientjes [this message]
2007-02-07  5:27   ` [patch 3/3] smaps: add clear_refs file to clear reference David Rientjes
2007-02-07  5:44   ` [patch 2/3] smaps: add pages referenced count to smaps Andrew Morton
2007-02-07  5:56     ` David Rientjes
2007-02-07  6:06       ` Andrew Morton
2007-02-09 19:35 [patch 1/3] smaps: extract pmd walker from smaps code David Rientjes
2007-02-09 19:36 ` [patch 2/3] smaps: add pages referenced count to smaps David Rientjes

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