Christoph Lameter wrote:
Add a flag SlabReclaimable() that is set on slabs with a method
that allows defrag/reclaim. Clear the flag if a reclaim action is not
successful in reducing the number of objects in a slab. The reclaim
flag is set again if all objects have been allocated from it.
Signed-off-by: Christoph Lameter <[email protected]>
---
mm/slub.c | 42 ++++++++++++++++++++++++++++++++++++------
1 file changed, 36 insertions(+), 6 deletions(-)
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2007-08-28 20:10:37.000000000 -0700
+++ linux-2.6/mm/slub.c 2007-08-28 20:10:47.000000000 -0700
@@ -107,6 +107,8 @@
#define SLABDEBUG 0
#endif
+#define SLABRECLAIMABLE (1 << PG_dirty)
+
static inline int SlabFrozen(struct page *page)
{
return page->flags & FROZEN;
@@ -137,6 +139,21 @@ static inline void ClearSlabDebug(struct
page->flags &= ~SLABDEBUG;
}
+static inline int SlabReclaimable(struct page *page)
+{
+ return page->flags & SLABRECLAIMABLE;
+}
+
+static inline void SetSlabReclaimable(struct page *page)
+{
+ page->flags |= SLABRECLAIMABLE;
+}
+
+static inline void ClearSlabReclaimable(struct page *page)
+{
+ page->flags &= ~SLABRECLAIMABLE;
+}
Why is it safe to not use the normal page flag bit operators
for these page flags operations?
--
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