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Subject[PATCH 5/9] clockpro-ignore_token.patch
Date

From: Peter Zijlstra <a.p.zijlstra@chello.nl>

Re-introduce the ignore_token argument to page_referenced(); hand hot
rotation will make use of this feature.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>

include/linux/rmap.h | 4 ++--
mm/page_replace.c | 2 +-
mm/rmap.c | 26 ++++++++++++++++----------
mm/vmscan.c | 2 +-
4 files changed, 20 insertions(+), 14 deletions(-)

Index: linux-2.6-git-2/include/linux/rmap.h
===================================================================
--- linux-2.6-git-2.orig/include/linux/rmap.h
+++ linux-2.6-git-2/include/linux/rmap.h
@@ -89,7 +89,7 @@ static inline void page_dup_rmap(struct
/*
* Called from mm/vmscan.c to handle paging out
*/
-int page_referenced(struct page *, int is_locked);
+int page_referenced(struct page *, int is_locked, int ignore_token);
int try_to_unmap(struct page *);

/*
@@ -109,7 +109,7 @@ unsigned long page_address_in_vma(struct
#define anon_vma_prepare(vma) (0)
#define anon_vma_link(vma) do {} while (0)

-#define page_referenced(page,l) TestClearPageReferenced(page)
+#define page_referenced(page,l,i) TestClearPageReferenced(page)
#define try_to_unmap(page) SWAP_FAIL

#endif /* CONFIG_MMU */
Index: linux-2.6-git-2/mm/page_replace.c
===================================================================
--- linux-2.6-git-2.orig/mm/page_replace.c
+++ linux-2.6-git-2/mm/page_replace.c
@@ -232,7 +232,7 @@ static void refill_inactive_zone(struct
if (page_mapped(page)) {
if (!reclaim_mapped ||
(total_swap_pages == 0 && PageAnon(page)) ||
- page_referenced(page, 0)) {
+ page_referenced(page, 0, 0)) {
list_add(&page->lru, &l_active);
continue;
}
Index: linux-2.6-git-2/mm/rmap.c
===================================================================
--- linux-2.6-git-2.orig/mm/rmap.c
+++ linux-2.6-git-2/mm/rmap.c
@@ -290,7 +290,7 @@ pte_t *page_check_address(struct page *p
* repeatedly from either page_referenced_anon or page_referenced_file.
*/
static int page_referenced_one(struct page *page,
- struct vm_area_struct *vma, unsigned int *mapcount)
+ struct vm_area_struct *vma, unsigned int *mapcount, int ignore_token)
{
struct mm_struct *mm = vma->vm_mm;
unsigned long address;
@@ -311,7 +311,7 @@ static int page_referenced_one(struct pa

/* Pretend the page is referenced if the task has the
swap token and is in the middle of a page fault. */
- if (mm != current->mm && has_swap_token(mm) &&
+ if (mm != current->mm && !ignore_token && has_swap_token(mm) &&
rwsem_is_locked(&mm->mmap_sem))
referenced++;

@@ -321,7 +321,7 @@ out:
return referenced;
}

-static int page_referenced_anon(struct page *page)
+static int page_referenced_anon(struct page *page, int ignore_token)
{
unsigned int mapcount;
struct anon_vma *anon_vma;
@@ -334,7 +334,8 @@ static int page_referenced_anon(struct p

mapcount = page_mapcount(page);
list_for_each_entry(vma, &anon_vma->head, anon_vma_node) {
- referenced += page_referenced_one(page, vma, &mapcount);
+ referenced += page_referenced_one(page, vma, &mapcount,
+ ignore_token);
if (!mapcount)
break;
}
@@ -353,7 +354,7 @@ static int page_referenced_anon(struct p
*
* This function is only called from page_referenced for object-based pages.
*/
-static int page_referenced_file(struct page *page)
+static int page_referenced_file(struct page *page, int ignore_token)
{
unsigned int mapcount;
struct address_space *mapping = page->mapping;
@@ -391,7 +392,8 @@ static int page_referenced_file(struct p
referenced++;
break;
}
- referenced += page_referenced_one(page, vma, &mapcount);
+ referenced += page_referenced_one(page, vma, &mapcount,
+ ignore_token);
if (!mapcount)
break;
}
@@ -408,10 +410,13 @@ static int page_referenced_file(struct p
* Quick test_and_clear_referenced for all mappings to a page,
* returns the number of ptes which referenced the page.
*/
-int page_referenced(struct page *page, int is_locked)
+int page_referenced(struct page *page, int is_locked, int ignore_token)
{
int referenced = 0;

+ if (!swap_token_default_timeout)
+ ignore_token = 1;
+
if (page_test_and_clear_young(page))
referenced++;

@@ -420,14 +425,15 @@ int page_referenced(struct page *page, i

if (page_mapped(page) && page->mapping) {
if (PageAnon(page))
- referenced += page_referenced_anon(page);
+ referenced += page_referenced_anon(page, ignore_token);
else if (is_locked)
- referenced += page_referenced_file(page);
+ referenced += page_referenced_file(page, ignore_token);
else if (TestSetPageLocked(page))
referenced++;
else {
if (page->mapping)
- referenced += page_referenced_file(page);
+ referenced += page_referenced_file(page,
+ ignore_token);
unlock_page(page);
}
}
Index: linux-2.6-git-2/mm/vmscan.c
===================================================================
--- linux-2.6-git-2.orig/mm/vmscan.c
+++ linux-2.6-git-2/mm/vmscan.c
@@ -352,7 +352,7 @@ static try_pageout_t try_pageout(struct
if (PageWriteback(page))
goto keep_locked;

- referenced = page_referenced(page, 1);
+ referenced = page_referenced(page, 1, 0);

if (referenced)
goto activate_locked;
-
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