Hi all!
It's a very simple patch that allows to see which pages are active and
which not.
It's very useful for debugging performance issues in mm.
I used the vmtouch tool (with a simple modification) to display the results.
R.
---
mm/mincore.c | 12 +++++++-----
1 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/mm/mincore.c b/mm/mincore.c
index 7c2874a..31301d2 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -61,7 +61,7 @@ static void mincore_hugetlb_page_range(struct
vm_area_struct *vma,
*/
static unsigned char mincore_page(struct address_space *mapping, pgoff_t pgoff)
{
- unsigned char present = 0;
+ unsigned char flags = 0;
struct page *page;
/*
@@ -79,13 +79,15 @@ static unsigned char mincore_page(struct
address_space *mapping, pgoff_t pgoff)
}
#endif
if (page) {
- present = PageUptodate(page);
- if (present)
- present |= (PageReadaheadUnused(page) << 7);
+ flags = PageUptodate(page);
+ if (flags) {
+ flags |= (PageActive(page) << 1);
+ flags |= (PageReadaheadUnused(page) << 7);
+ }
page_cache_release(page);
}
- return present;
+ return flags;
}
static void mincore_unmapped_range(struct vm_area_struct *vma,
--
--
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