On Wed, 17 Aug 2011, Andrew Morton wrote:

> This is an obvious place.  Could I ask that you split all these up into
> one-definition-per-line and we can start in on properly documenting
> each field?

Subject: mm: Add comments to explain mm_struct fields

Explain comments to explain the page statistics field in the
mm_struct.

Signed-off-by: Christoph Lameter <[email protected]>

---
 include/linux/mm_types.h |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

Index: linux-2.6/include/linux/mm_types.h
===================================================================
--- linux-2.6.orig/include/linux/mm_types.h     2011-08-23 09:43:32.000000000 
-0500
+++ linux-2.6/include/linux/mm_types.h  2011-08-23 09:52:09.000000000 -0500
@@ -281,8 +281,15 @@ struct mm_struct {
        unsigned long hiwater_rss;      /* High-watermark of RSS usage */
        unsigned long hiwater_vm;       /* High-water virtual memory usage */

-       unsigned long total_vm, locked_vm, pinned_vm, shared_vm, exec_vm;
-       unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
+       unsigned long total_vm;         /* Total pages mapped */
+       unsigned long locked_vm         /* Pages that have PG_mlocked set */
+       unsigned long pinned_vm;        /* Refcount permanently increased */
+       unsigned long shared_vm;        /* Shared pages (files) */
+       unsigned long exec_vm;          /* VM_EXEC & ~VM_WRITE */
+       unsigned long stack_vm;         /* VM_GROWSUP/DOWN */
+       unsigned long reserved_vm;      /* VM_RESERVED|VM_IO pages */
+       unsigned long def_flags;
+       unsigned long nr_ptes;          /* Page table pages */
        unsigned long start_code, end_code, start_data, end_data;
        unsigned long start_brk, brk, start_stack;
        unsigned long arg_start, arg_end, env_start, env_end;
--
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