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mm: further cleanup page_add_new_anon_rmap

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Moving lru_cache_add_active_or_unevictable() into page_add_new_anon_rmap()
was good but stupid: we can and should SetPageSwapBacked() there too; and
we know for sure that this anonymous, swap-backed page is not file cache.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2009-01-06 14:39:27 -08:00 committed by Linus Torvalds
parent 2afd1c928f
commit cbf84b7add
2 changed files with 3 additions and 6 deletions
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3
mm/memory.c
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@ -1948,7 +1948,6 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
* thread doing COW.
*/
ptep_clear_flush_notify(vma, address, page_table);
SetPageSwapBacked(new_page);
page_add_new_anon_rmap(new_page, vma, address);
set_pte_at(mm, address, page_table, entry);
update_mmu_cache(vma, address, entry);
@ -2444,7 +2443,6 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
if (!pte_none(*page_table))
goto release;
inc_mm_counter(mm, anon_rss);
SetPageSwapBacked(page);
page_add_new_anon_rmap(page, vma, address);
set_pte_at(mm, address, page_table, entry);
@ -2592,7 +2590,6 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
entry = maybe_mkwrite(pte_mkdirty(entry), vma);
if (anon) {
inc_mm_counter(mm, anon_rss);
SetPageSwapBacked(page);
page_add_new_anon_rmap(page, vma, address);
} else {
inc_mm_counter(mm, file_rss);

6
mm/rmap.c
View File

@ -47,7 +47,6 @@
#include <linux/rmap.h>
#include <linux/rcupdate.h>
#include <linux/module.h>
#include <linux/mm_inline.h>
#include <linux/kallsyms.h>
#include <linux/memcontrol.h>
#include <linux/mmu_notifier.h>
@ -673,10 +672,11 @@ void page_add_new_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
VM_BUG_ON(address < vma->vm_start || address >= vma->vm_end);
atomic_set(&page->_mapcount, 0); /* elevate count by 1 (starts at -1) */
SetPageSwapBacked(page);
atomic_set(&page->_mapcount, 0); /* increment count (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));
lru_cache_add_lru(page, LRU_ACTIVE_ANON);
else
add_page_to_unevictable_list(page);
}