On Wed, 7 Nov 2012 01:05:50 -0200
Rafael Aquini <aquini@xxxxxxxxxx> wrote:
> Memory fragmentation introduced by ballooning might reduce significantly
> the number of 2MB contiguous memory blocks that can be used within a guest,
> thus imposing performance penalties associated with the reduced number of
> transparent huge pages that could be used by the guest workload.
>
> This patch introduces a common interface to help a balloon driver on
> making its page set movable to compaction, and thus allowing the system
> to better leverage the compation efforts on memory defragmentation.
mm/migrate.c: In function 'unmap_and_move':
mm/migrate.c:899: error: 'COMPACTBALLOONRELEASED' undeclared (first use in this function)
mm/migrate.c:899: error: (Each undeclared identifier is reported only once
mm/migrate.c:899: error: for each function it appears in.)
You've been bad - you didn't test with your feature disabled.
Please do that. And not just compilation testing.
We can fix this one with a sucky macro. I think that's better than
unconditionally defining the enums.
--- a/include/linux/balloon_compaction.h~mm-introduce-a-common-interface-for-balloon-pages-mobility-fix
+++ a/include/linux/balloon_compaction.h
@@ -207,10 +207,8 @@ static inline gfp_t balloon_mapping_gfp_
return GFP_HIGHUSER;
}
-static inline void balloon_event_count(enum vm_event_item item)
-{
- return;
-}
+/* A macro, to avoid generating references to the undefined COMPACTBALLOON* */
+#define balloon_event_count(item) do { } while (0)
static inline bool balloon_compaction_check(void)
{
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