lkml.org 
[lkml]   [2012]   [Nov]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [PATCH v11 3/7] mm: introduce a common interface for balloon pages mobility
On Wed,  7 Nov 2012 01:05:50 -0200
Rafael Aquini <aquini@redhat.com> 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)
{


\
 
 \ /
  Last update: 2012-11-07 22:41    [W:0.207 / U:0.388 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site