Add another flag to the vmalloc subsystem to mark virtual compound pages.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
---

 include/linux/vmalloc.h |    1 +

 mm/vmalloc.c            |    3 +++

 2 files changed, 4 insertions(+)
Index: linux-2.6.25-rc5-mm1/include/linux/vmalloc.h

===================================================================

--- linux-2.6.25-rc5-mm1.orig/include/linux/vmalloc.h	2008-03-19 18:17:42.093443900 -0700

+++ linux-2.6.25-rc5-mm1/include/linux/vmalloc.h	2008-03-19 18:27:20.150422445 -0700

@@ -12,6 +12,7 @@ struct vm_area_struct;

 #define VM_MAP		0x00000004	/* vmap()ed pages */

 #define VM_USERMAP	0x00000008	/* suitable for remap_vmalloc_range */

 #define VM_VPAGES	0x00000010	/* buffer for pages was vmalloc'ed */

+#define VM_VCOMPOUND	0x00000020	/* Page allocator fallback */

 /* bits [20..32] reserved for arch specific ioremap internals */
 /*

Index: linux-2.6.25-rc5-mm1/mm/vmalloc.c

===================================================================

--- linux-2.6.25-rc5-mm1.orig/mm/vmalloc.c	2008-03-19 18:18:02.689633934 -0700

+++ linux-2.6.25-rc5-mm1/mm/vmalloc.c	2008-03-19 18:27:20.150422445 -0700

@@ -974,6 +974,9 @@ static int s_show(struct seq_file *m, vo

 	if (v->flags & VM_VPAGES)

 		seq_printf(m, " vpages");
+	if (v->flags & VM_VCOMPOUND)

+		seq_printf(m, " vcompound");

+

 	seq_putc(m, '\n');

 	return 0;

 }
--

--

I would love to see NUMA information as well on vmallocinfo, but have

currently no available time to prepare a patch.
Counters with numbers of pages per node would be great.
(like in /proc/pid/numa_maps)
N0=2 N1=2 N2=2 N3=2
This way we could check hashdist is working or not, since it depends on

various numa policies :)
--

Ok. Easy to add.

--