[PATCH] VM: add page_state info to per-node meminfo
Add page_state info to the per-node meminfo file in sysfs. This is mostly
just for informational purposes.
The lack of this information was brought up recently during a discussion
regarding pagecache clearing, and I put this patch together to test out one
of the suggestions.
It seems like interesting info to have, so I'm submitting the patch.
Signed-off-by: Martin Hicks <mort@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 904b27c..16c513a 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -39,13 +39,25 @@
int n;
int nid = dev->id;
struct sysinfo i;
+ struct page_state ps;
unsigned long inactive;
unsigned long active;
unsigned long free;
si_meminfo_node(&i, nid);
+ get_page_state_node(&ps, nid);
__get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
+ /* Check for negative values in these approximate counters */
+ if ((long)ps.nr_dirty < 0)
+ ps.nr_dirty = 0;
+ if ((long)ps.nr_writeback < 0)
+ ps.nr_writeback = 0;
+ if ((long)ps.nr_mapped < 0)
+ ps.nr_mapped = 0;
+ if ((long)ps.nr_slab < 0)
+ ps.nr_slab = 0;
+
n = sprintf(buf, "\n"
"Node %d MemTotal: %8lu kB\n"
"Node %d MemFree: %8lu kB\n"
@@ -55,7 +67,11 @@
"Node %d HighTotal: %8lu kB\n"
"Node %d HighFree: %8lu kB\n"
"Node %d LowTotal: %8lu kB\n"
- "Node %d LowFree: %8lu kB\n",
+ "Node %d LowFree: %8lu kB\n"
+ "Node %d Dirty: %8lu kB\n"
+ "Node %d Writeback: %8lu kB\n"
+ "Node %d Mapped: %8lu kB\n"
+ "Node %d Slab: %8lu kB\n",
nid, K(i.totalram),
nid, K(i.freeram),
nid, K(i.totalram - i.freeram),
@@ -64,7 +80,11 @@
nid, K(i.totalhigh),
nid, K(i.freehigh),
nid, K(i.totalram - i.totalhigh),
- nid, K(i.freeram - i.freehigh));
+ nid, K(i.freeram - i.freehigh),
+ nid, K(ps.nr_dirty),
+ nid, K(ps.nr_writeback),
+ nid, K(ps.nr_mapped),
+ nid, K(ps.nr_slab));
n += hugetlb_report_node_meminfo(nid, buf + n);
return n;
}