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Subject[patch 12/20] Non-reclaimable page statistics
V2 -> V3:
+ rebase to 23-mm1 atop RvR's split LRU series

V1 -> V2:
no changes

Report non-reclaimable pages per zone and system wide.

Note: may want to track/report some specific reasons for
nonreclaimability for deciding when to splice the noreclaim
lists back to the normal lru. That will be tricky,
especially in shrink_active_list(), where we'd need someplace
to save the per page reason for non-reclaimability until the
pages are dumped back onto the noreclaim list from the pagevec.

Note: my tests indicate that NR_NORECLAIM and probably the
other LRU stats aren't being maintained properly--especially
with large amounts of mlocked memory and the mlock patch in
this series installed. Can't be sure of this, as I don't
know why the pages are on the noreclaim list. Needs further
investigation.

Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>

Index: linux-2.6.25-rc3-mm1/mm/page_alloc.c
===================================================================
--- linux-2.6.25-rc3-mm1.orig/mm/page_alloc.c 2008-03-04 16:07:35.000000000 -0500
+++ linux-2.6.25-rc3-mm1/mm/page_alloc.c 2008-03-04 16:13:13.000000000 -0500
@@ -1914,12 +1914,20 @@ void show_free_areas(void)
}

printk("Active_anon:%lu active_file:%lu inactive_anon%lu\n"
- " inactive_file:%lu dirty:%lu writeback:%lu unstable:%lu\n"
+ " inactive_file:%lu"
+//TODO: check/adjust line lengths
+#ifdef CONFIG_NORECLAIM_LRU
+ " noreclaim:%lu"
+#endif
+ " dirty:%lu writeback:%lu unstable:%lu\n"
" free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
global_page_state(NR_ACTIVE_ANON),
global_page_state(NR_ACTIVE_FILE),
global_page_state(NR_INACTIVE_ANON),
global_page_state(NR_INACTIVE_FILE),
+#ifdef CONFIG_NORECLAIM_LRU
+ global_page_state(NR_NORECLAIM),
+#endif
global_page_state(NR_FILE_DIRTY),
global_page_state(NR_WRITEBACK),
global_page_state(NR_UNSTABLE_NFS),
@@ -1946,6 +1954,9 @@ void show_free_areas(void)
" inactive_anon:%lukB"
" active_file:%lukB"
" inactive_file:%lukB"
+#ifdef CONFIG_NORECLAIM_LRU
+ " noreclaim:%lukB"
+#endif
" present:%lukB"
" pages_scanned:%lu"
" all_unreclaimable? %s"
@@ -1959,6 +1970,9 @@ void show_free_areas(void)
K(zone_page_state(zone, NR_INACTIVE_ANON)),
K(zone_page_state(zone, NR_ACTIVE_FILE)),
K(zone_page_state(zone, NR_INACTIVE_FILE)),
+#ifdef CONFIG_NORECLAIM_LRU
+ K(zone_page_state(zone, NR_NORECLAIM)),
+#endif
K(zone->present_pages),
zone->pages_scanned,
(zone_is_all_unreclaimable(zone) ? "yes" : "no")
Index: linux-2.6.25-rc3-mm1/mm/vmstat.c
===================================================================
--- linux-2.6.25-rc3-mm1.orig/mm/vmstat.c 2008-03-04 15:39:31.000000000 -0500
+++ linux-2.6.25-rc3-mm1/mm/vmstat.c 2008-03-04 16:13:13.000000000 -0500
@@ -690,6 +690,9 @@ static const char * const vmstat_text[]
"nr_active_anon",
"nr_inactive_file",
"nr_active_file",
+#ifdef CONFIG_NORECLAIM_LRU
+ "nr_noreclaim",
+#endif
"nr_anon_pages",
"nr_mapped",
"nr_file_pages",
Index: linux-2.6.25-rc3-mm1/drivers/base/node.c
===================================================================
--- linux-2.6.25-rc3-mm1.orig/drivers/base/node.c 2008-03-04 15:30:20.000000000 -0500
+++ linux-2.6.25-rc3-mm1/drivers/base/node.c 2008-03-04 16:13:13.000000000 -0500
@@ -52,6 +52,9 @@ static ssize_t node_read_meminfo(struct
"Node %d Inactive(anon): %8lu kB\n"
"Node %d Active(file): %8lu kB\n"
"Node %d Inactive(file): %8lu kB\n"
+#ifdef CONFIG_NORECLAIM_LRU
+ "Node %d Noreclaim: %8lu kB\n"
+#endif
#ifdef CONFIG_HIGHMEM
"Node %d HighTotal: %8lu kB\n"
"Node %d HighFree: %8lu kB\n"
@@ -76,6 +79,9 @@ static ssize_t node_read_meminfo(struct
nid, node_page_state(nid, NR_INACTIVE_ANON),
nid, node_page_state(nid, NR_ACTIVE_FILE),
nid, node_page_state(nid, NR_INACTIVE_FILE),
+#ifdef CONFIG_NORECLAIM_LRU
+ nid, node_page_state(nid, NR_NORECLAIM),
+#endif
#ifdef CONFIG_HIGHMEM
nid, K(i.totalhigh),
nid, K(i.freehigh),
Index: linux-2.6.25-rc3-mm1/fs/proc/proc_misc.c
===================================================================
--- linux-2.6.25-rc3-mm1.orig/fs/proc/proc_misc.c 2008-03-04 15:30:20.000000000 -0500
+++ linux-2.6.25-rc3-mm1/fs/proc/proc_misc.c 2008-03-04 16:13:13.000000000 -0500
@@ -173,6 +173,9 @@ static int meminfo_read_proc(char *page,
"Inactive(anon): %8lu kB\n"
"Active(file): %8lu kB\n"
"Inactive(file): %8lu kB\n"
+#ifdef CONFIG_NORECLAIM_LRU
+ "Noreclaim: %8lu kB\n"
+#endif
#ifdef CONFIG_HIGHMEM
"HighTotal: %8lu kB\n"
"HighFree: %8lu kB\n"
@@ -207,6 +210,9 @@ static int meminfo_read_proc(char *page,
K(inactive_anon),
K(active_file),
K(inactive_file),
+#ifdef CONFIG_NORECLAIM_LRU
+ K(global_page_state(NR_NORECLAIM)),
+#endif
#ifdef CONFIG_HIGHMEM
K(i.totalhigh),
K(i.freehigh),
--
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