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authorJoonsoo Kim <iamjoonsoo.kim@lge.com>2015-02-12 02:27:09 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-12 04:06:04 +0300
commit24e2716f63e613cf15d3beba3faa0711bcacc427 (patch)
tree7ab8b73ff2977b76e4a3486730614999ea42e4d3 /include/trace
parent837d026d560c5ef26abeca0441713d82e4e82cad (diff)
downloadlinux-24e2716f63e613cf15d3beba3faa0711bcacc427.tar.xz
mm/compaction: add tracepoint to observe behaviour of compaction defer
Compaction deferring logic is heavy hammer that block the way to the compaction. It doesn't consider overall system state, so it could prevent user from doing compaction falsely. In other words, even if system has enough range of memory to compact, compaction would be skipped due to compaction deferring logic. This patch add new tracepoint to understand work of deferring logic. This will also help to check compaction success and fail. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Mel Gorman <mgorman@suse.de> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/compaction.h56
1 files changed, 56 insertions, 0 deletions
diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h
index d46535801f63..9a6a3fe0fb51 100644
--- a/include/trace/events/compaction.h
+++ b/include/trace/events/compaction.h
@@ -238,6 +238,62 @@ DEFINE_EVENT(mm_compaction_suitable_template, mm_compaction_suitable,
TP_ARGS(zone, order, ret)
);
+#ifdef CONFIG_COMPACTION
+DECLARE_EVENT_CLASS(mm_compaction_defer_template,
+
+ TP_PROTO(struct zone *zone, int order),
+
+ TP_ARGS(zone, order),
+
+ TP_STRUCT__entry(
+ __field(int, nid)
+ __field(char *, name)
+ __field(int, order)
+ __field(unsigned int, considered)
+ __field(unsigned int, defer_shift)
+ __field(int, order_failed)
+ ),
+
+ TP_fast_assign(
+ __entry->nid = zone_to_nid(zone);
+ __entry->name = (char *)zone->name;
+ __entry->order = order;
+ __entry->considered = zone->compact_considered;
+ __entry->defer_shift = zone->compact_defer_shift;
+ __entry->order_failed = zone->compact_order_failed;
+ ),
+
+ TP_printk("node=%d zone=%-8s order=%d order_failed=%d consider=%u limit=%lu",
+ __entry->nid,
+ __entry->name,
+ __entry->order,
+ __entry->order_failed,
+ __entry->considered,
+ 1UL << __entry->defer_shift)
+);
+
+DEFINE_EVENT(mm_compaction_defer_template, mm_compaction_deferred,
+
+ TP_PROTO(struct zone *zone, int order),
+
+ TP_ARGS(zone, order)
+);
+
+DEFINE_EVENT(mm_compaction_defer_template, mm_compaction_defer_compaction,
+
+ TP_PROTO(struct zone *zone, int order),
+
+ TP_ARGS(zone, order)
+);
+
+DEFINE_EVENT(mm_compaction_defer_template, mm_compaction_defer_reset,
+
+ TP_PROTO(struct zone *zone, int order),
+
+ TP_ARGS(zone, order)
+);
+#endif
+
#endif /* _TRACE_COMPACTION_H */
/* This part must be outside protection */