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[PATCH] mm: update stale comment for removal of page->list

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Update comment for the 2.6.6-rc1 conversion from page->list and
address_space->{clean,dirty,locked}_pages to radix tree tagging and ->lru.

I've mostly avoided to mention page lists (at least I've shortened the
comment).

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2005-09-21 09:55:38 -07:00 committed by Linus Torvalds
parent f875a1a665
commit 7e871b6c8f
1 changed files with 4 additions and 5 deletions
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9
include/linux/mm.h
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@ -350,7 +350,8 @@ 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 +377,8 @@ 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.