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authorJeff Garzik <jgarzik@pobox.com>2005-09-23 19:03:21 -0400
committerJeff Garzik <jgarzik@pobox.com>2005-09-23 19:03:21 -0400
commit536f8098026bde1368bbfcbcb9682a7637b73df2 (patch)
treecf83d2e1afa503b6aeba103b55cd1da0af4e7a4c /include/linux/mm.h
parente86ee6682b649183c11013a98be02f25e9ae399d (diff)
parent3fd07d3bf0077dcc0f5a33d2eb1938ea050da8da (diff)
Merge /spare/repo/linux-2.6/
Diffstat (limited to 'include/linux/mm.h')
-rw-r--r--include/linux/mm.h10
1 files changed, 5 insertions, 5 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 82d7024f076..097b3a3c693 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -136,6 +136,7 @@ extern unsigned int kobjsize(const void *objp);
#define VM_EXEC 0x00000004
#define VM_SHARED 0x00000008
+/* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
#define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
#define VM_MAYWRITE 0x00000020
#define VM_MAYEXEC 0x00000040
@@ -350,7 +351,8 @@ static inline void put_page(struct page *page)
* only one copy in memory, at most, normally.
*
* For the non-reserved pages, page_count(page) denotes a reference count.
- * page_count() == 0 means the page is free.
+ * page_count() == 0 means the page is free. page->lru is then used for
+ * freelist management in the buddy allocator.
* page_count() == 1 means the page is used for exactly one purpose
* (e.g. a private data page of one process).
*
@@ -376,10 +378,8 @@ static inline void put_page(struct page *page)
* attaches, plus 1 if `private' contains something, plus one for
* the page cache itself.
*
- * All pages belonging to an inode are in these doubly linked lists:
- * mapping->clean_pages, mapping->dirty_pages and mapping->locked_pages;
- * using the page->list list_head. These fields are also used for
- * freelist managemet (when page_count()==0).
+ * Instead of keeping dirty/clean pages in per address-space lists, we instead
+ * now tag pages as dirty/under writeback in the radix tree.
*
* There is also a per-mapping radix tree mapping index to the page
* in memory if present. The tree is rooted at mapping->root.