From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 20 Nov 2008 01:22:45 +0000 (GMT) From: Hugh Dickins Subject: [PATCH 6/7] mm: add_active_or_unevictable into rmap In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: Rik van Riel , Lee Schermerhorn , Nick Piggin , linux-mm@kvack.org List-ID: lru_cache_add_active_or_unevictable() and page_add_new_anon_rmap() always appear together. Save some symbol table space and some jumping around by removing lru_cache_add_active_or_unevictable(), folding its code into page_add_new_anon_rmap(): like how we add file pages to lru just after adding them to page cache. Remove the nearby "TODO: is this safe?" comments (yes, it is safe), and change page_add_new_anon_rmap()'s address BUG_ON to VM_BUG_ON as originally intended. Signed-off-by: Hugh Dickins --- include/linux/swap.h | 2 -- mm/memory.c | 6 ------ mm/rmap.c | 7 ++++++- mm/swap.c | 19 ------------------- 4 files changed, 6 insertions(+), 28 deletions(-) --- mmclean5/include/linux/swap.h 2008-11-19 15:25:12.000000000 +0000 +++ mmclean6/include/linux/swap.h 2008-11-19 15:26:28.000000000 +0000 @@ -174,8 +174,6 @@ extern unsigned int nr_free_pagecache_pa /* linux/mm/swap.c */ extern void __lru_cache_add(struct page *, enum lru_list lru); extern void lru_cache_add_lru(struct page *, enum lru_list lru); -extern void lru_cache_add_active_or_unevictable(struct page *, - struct vm_area_struct *); extern void activate_page(struct page *); extern void mark_page_accessed(struct page *); extern void lru_add_drain(void); --- mmclean5/mm/memory.c 2008-11-19 15:25:12.000000000 +0000 +++ mmclean6/mm/memory.c 2008-11-19 15:26:28.000000000 +0000 @@ -1920,10 +1920,7 @@ gotten: */ ptep_clear_flush_notify(vma, address, page_table); SetPageSwapBacked(new_page); - lru_cache_add_active_or_unevictable(new_page, vma); page_add_new_anon_rmap(new_page, vma, address); - -//TODO: is this safe? do_anonymous_page() does it this way. set_pte_at(mm, address, page_table, entry); update_mmu_cache(vma, address, entry); if (old_page) { @@ -2419,7 +2416,6 @@ static int do_anonymous_page(struct mm_s goto release; inc_mm_counter(mm, anon_rss); SetPageSwapBacked(page); - lru_cache_add_active_or_unevictable(page, vma); page_add_new_anon_rmap(page, vma, address); set_pte_at(mm, address, page_table, entry); @@ -2568,7 +2564,6 @@ static int __do_fault(struct mm_struct * if (anon) { inc_mm_counter(mm, anon_rss); SetPageSwapBacked(page); - lru_cache_add_active_or_unevictable(page, vma); page_add_new_anon_rmap(page, vma, address); } else { inc_mm_counter(mm, file_rss); @@ -2578,7 +2573,6 @@ static int __do_fault(struct mm_struct * get_page(dirty_page); } } -//TODO: is this safe? do_anonymous_page() does it this way. set_pte_at(mm, address, page_table, entry); /* no need to invalidate: a not-present page won't be cached */ --- mmclean5/mm/rmap.c 2008-11-19 15:25:12.000000000 +0000 +++ mmclean6/mm/rmap.c 2008-11-19 15:26:28.000000000 +0000 @@ -47,6 +47,7 @@ #include #include #include +#include #include #include #include @@ -671,9 +672,13 @@ void page_add_anon_rmap(struct page *pag void page_add_new_anon_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address) { - BUG_ON(address < vma->vm_start || address >= vma->vm_end); + VM_BUG_ON(address < vma->vm_start || address >= vma->vm_end); atomic_set(&page->_mapcount, 0); /* elevate count by 1 (starts at -1) */ __page_set_anon_rmap(page, vma, address); + if (page_evictable(page, vma)) + lru_cache_add_lru(page, LRU_ACTIVE + page_is_file_cache(page)); + else + add_page_to_unevictable_list(page); } /** --- mmclean5/mm/swap.c 2008-11-19 15:25:12.000000000 +0000 +++ mmclean6/mm/swap.c 2008-11-19 15:26:28.000000000 +0000 @@ -246,25 +246,6 @@ void add_page_to_unevictable_list(struct spin_unlock_irq(&zone->lru_lock); } -/** - * lru_cache_add_active_or_unevictable - * @page: the page to be added to LRU - * @vma: vma in which page is mapped for determining reclaimability - * - * place @page on active or unevictable LRU list, depending on - * page_evictable(). Note that if the page is not evictable, - * it goes directly back onto it's zone's unevictable list. It does - * NOT use a per cpu pagevec. - */ -void lru_cache_add_active_or_unevictable(struct page *page, - struct vm_area_struct *vma) -{ - if (page_evictable(page, vma)) - lru_cache_add_lru(page, LRU_ACTIVE + page_is_file_cache(page)); - else - add_page_to_unevictable_list(page); -} - /* * Drain pages out of the cpu's pagevecs. * Either "cpu" is the current CPU, and preemption has already been -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org