[PATCH v2] mm: compaction: some tracepoints should be defined only when CONFIG_COMPACTION is set

[PATCH v2] mm: compaction: some tracepoints should be defined only when CONFIG_COMPACTION is set

[Yafang Shao]

Only mm_compaction_isolate_{free, migrate}pages may be used when
CONFIG_COMPACTION is not set.
All others are used only when CONFIG_COMPACTION is set.

After this change, if CONFIG_COMPACTION is not set, the tracepoints
that only work when CONFIG_COMPACTION is set will not be exposed to
the usespace.
Without this change, they will always be expose in debugfs no matter
CONFIG_COMPACTION is set or not.
That is an improvement.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
 include/trace/events/compaction.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h
index 6074eff..3e42078 100644
--- a/include/trace/events/compaction.h
+++ b/include/trace/events/compaction.h
@@ -64,6 +64,7 @@
 	TP_ARGS(start_pfn, end_pfn, nr_scanned, nr_taken)
 );
 
+#ifdef CONFIG_COMPACTION
 TRACE_EVENT(mm_compaction_migratepages,
 
 	TP_PROTO(unsigned long nr_all,
@@ -132,7 +133,6 @@
 		__entry->sync ? "sync" : "async")
 );
 
-#ifdef CONFIG_COMPACTION
 TRACE_EVENT(mm_compaction_end,
 	TP_PROTO(unsigned long zone_start, unsigned long migrate_pfn,
 		unsigned long free_pfn, unsigned long zone_end, bool sync,
@@ -166,7 +166,6 @@
 		__entry->sync ? "sync" : "async",
 		__print_symbolic(__entry->status, COMPACTION_STATUS))
 );
-#endif
 
 TRACE_EVENT(mm_compaction_try_to_compact_pages,
 
@@ -195,7 +194,6 @@
 		__entry->prio)
 );
 
-#ifdef CONFIG_COMPACTION
 DECLARE_EVENT_CLASS(mm_compaction_suitable_template,
 
 	TP_PROTO(struct zone *zone,
@@ -296,7 +294,6 @@
 
 	TP_ARGS(zone, order)
 );
-#endif
 
 TRACE_EVENT(mm_compaction_kcompactd_sleep,
 
@@ -352,6 +349,7 @@
 
 	TP_ARGS(nid, order, classzone_idx)
 );
+#endif
 
 #endif /* _TRACE_COMPACTION_H */
 
-- 
1.8.3.1