From: Christoph Lameter <clameter@sgi.com>

Basic infrastructure to support NR_MLOCK

Add a new ZVC to support NR_MLOCK.  NR_MLOCK counts the number of mlocked
pages taken off the LRU.  Get rid of wrong calculation of cache line size in
the comments in mmzone.h.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/base/node.c    |    2 ++
 fs/proc/proc_misc.c    |    2 ++
 include/linux/mmzone.h |    3 +--
 mm/vmstat.c            |    1 +
 4 files changed, 6 insertions(+), 2 deletions(-)

diff -puN drivers/base/node.c~add-nr_mlock-zvc drivers/base/node.c
--- a/drivers/base/node.c~add-nr_mlock-zvc
+++ a/drivers/base/node.c
@@ -60,6 +60,7 @@ static ssize_t node_read_meminfo(struct 
 		       "Node %d FilePages:    %8lu kB\n"
 		       "Node %d Mapped:       %8lu kB\n"
 		       "Node %d AnonPages:    %8lu kB\n"
+		       "Node %d Mlock:        %8lu KB\n"
 		       "Node %d PageTables:   %8lu kB\n"
 		       "Node %d NFS_Unstable: %8lu kB\n"
 		       "Node %d Bounce:       %8lu kB\n"
@@ -82,6 +83,7 @@ static ssize_t node_read_meminfo(struct 
 		       nid, K(node_page_state(nid, NR_FILE_PAGES)),
 		       nid, K(node_page_state(nid, NR_FILE_MAPPED)),
 		       nid, K(node_page_state(nid, NR_ANON_PAGES)),
+		       nid, K(node_page_state(nid, NR_MLOCK)),
 		       nid, K(node_page_state(nid, NR_PAGETABLE)),
 		       nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
 		       nid, K(node_page_state(nid, NR_BOUNCE)),
diff -puN fs/proc/proc_misc.c~add-nr_mlock-zvc fs/proc/proc_misc.c
--- a/fs/proc/proc_misc.c~add-nr_mlock-zvc
+++ a/fs/proc/proc_misc.c
@@ -166,6 +166,7 @@ static int meminfo_read_proc(char *page,
 		"Writeback:    %8lu kB\n"
 		"AnonPages:    %8lu kB\n"
 		"Mapped:       %8lu kB\n"
+		"Mlock:        %8lu KB\n"
 		"Slab:         %8lu kB\n"
 		"SReclaimable: %8lu kB\n"
 		"SUnreclaim:   %8lu kB\n"
@@ -196,6 +197,7 @@ static int meminfo_read_proc(char *page,
 		K(global_page_state(NR_WRITEBACK)),
 		K(global_page_state(NR_ANON_PAGES)),
 		K(global_page_state(NR_FILE_MAPPED)),
+		K(global_page_state(NR_MLOCK)),
 		K(global_page_state(NR_SLAB_RECLAIMABLE) +
 				global_page_state(NR_SLAB_UNRECLAIMABLE)),
 		K(global_page_state(NR_SLAB_RECLAIMABLE)),
diff -puN include/linux/mmzone.h~add-nr_mlock-zvc include/linux/mmzone.h
--- a/include/linux/mmzone.h~add-nr_mlock-zvc
+++ a/include/linux/mmzone.h
@@ -47,17 +47,16 @@ struct zone_padding {
 #endif
 
 enum zone_stat_item {
-	/* First 128 byte cacheline (assuming 64 bit words) */
 	NR_FREE_PAGES,
 	NR_INACTIVE,
 	NR_ACTIVE,
+	NR_MLOCK,	/* Mlocked pages */
 	NR_ANON_PAGES,	/* Mapped anonymous pages */
 	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
 			   only modified from process context */
 	NR_FILE_PAGES,
 	NR_FILE_DIRTY,
 	NR_WRITEBACK,
-	/* Second 128 byte cacheline */
 	NR_SLAB_RECLAIMABLE,
 	NR_SLAB_UNRECLAIMABLE,
 	NR_PAGETABLE,		/* used for pagetables */
diff -puN mm/vmstat.c~add-nr_mlock-zvc mm/vmstat.c
--- a/mm/vmstat.c~add-nr_mlock-zvc
+++ a/mm/vmstat.c
@@ -434,6 +434,7 @@ static const char * const vmstat_text[] 
 	"nr_free_pages",
 	"nr_active",
 	"nr_inactive",
+	"nr_mlock",
 	"nr_anon_pages",
 	"nr_mapped",
 	"nr_file_pages",
_