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authorWu Fengguang <fengguang.wu@intel.com>2009-06-16 15:33:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-16 19:47:44 -0700
commit6fe6b7e35785e3232ffe7f81d3893f1316710a02 (patch)
tree6f47c03735504d8aab8f7b048465b87cc5b15861 /mm/vmscan.c
parent608e8e66a154cbc3d591a59dcebfd9cbc9e3431a (diff)
downloadlwn-6fe6b7e35785e3232ffe7f81d3893f1316710a02.tar.gz
lwn-6fe6b7e35785e3232ffe7f81d3893f1316710a02.zip
vmscan: report vm_flags in page_referenced()
Collect vma->vm_flags of the VMAs that actually referenced the page. This is preparing for more informed reclaim heuristics, eg. to protect executable file pages more aggressively. For now only the VM_EXEC bit will be used by the caller. Thanks to Johannes, Peter and Minchan for all the good tips. Acked-by: Peter Zijlstra <peterz@infradead.org> Reviewed-by: Rik van Riel <riel@redhat.com> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 52339dd7bf85..6be2068f61c8 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -577,6 +577,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
struct pagevec freed_pvec;
int pgactivate = 0;
unsigned long nr_reclaimed = 0;
+ unsigned long vm_flags;
cond_resched();
@@ -627,7 +628,8 @@ static unsigned long shrink_page_list(struct list_head *page_list,
goto keep_locked;
}
- referenced = page_referenced(page, 1, sc->mem_cgroup);
+ referenced = page_referenced(page, 1,
+ sc->mem_cgroup, &vm_flags);
/* In active use or really unfreeable? Activate it. */
if (sc->order <= PAGE_ALLOC_COSTLY_ORDER &&
referenced && page_mapping_inuse(page))
@@ -1208,6 +1210,7 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
{
unsigned long pgmoved;
unsigned long pgscanned;
+ unsigned long vm_flags;
LIST_HEAD(l_hold); /* The pages which were snipped off */
LIST_HEAD(l_inactive);
struct page *page;
@@ -1248,7 +1251,7 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
/* page_referenced clears PageReferenced */
if (page_mapping_inuse(page) &&
- page_referenced(page, 0, sc->mem_cgroup))
+ page_referenced(page, 0, sc->mem_cgroup, &vm_flags))
pgmoved++;
list_add(&page->lru, &l_inactive);