mm, compaction: export tracepoints zone names to userspace

Some compaction tracepoints use zone->name to print which zone is being
compacted.  This works for in-kernel printing, but not userspace trace
printing of raw captured trace such as via trace-cmd report.

This patch uses zone_idx() instead of zone->name as the raw value, and
when printing, converts the zone_type to string using the appropriate EM()
macros and some ugly tricks to overcome the problem that half the values
depend on CONFIG_ options and one does not simply use #ifdef inside of
#define.

trace-cmd output before:
transhuge-stres-4235  [000]   453.149280: mm_compaction_finished: node=0
zone=ffffffff81815d7a order=9 ret=partial

after:
transhuge-stres-4235  [000]   453.149280: mm_compaction_finished: node=0
zone=Normal   order=9 ret=partial

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Valentin Rothberg <valentinrothberg@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h
index 1275a55..a43000d 100644 (file)
--- a/include/trace/events/compaction.h
+++ b/include/trace/events/compaction.h
@@ -18,6 +18,31 @@
        EM( COMPACT_NO_SUITABLE_PAGE,   "no_suitable_page")     \
        EMe(COMPACT_NOT_SUITABLE_ZONE,  "not_suitable_zone")
 
+#ifdef CONFIG_ZONE_DMA
+#define IFDEF_ZONE_DMA(X) X
+#else
+#define IFDEF_ZONE_DMA(X)
+#endif
+
+#ifdef CONFIG_ZONE_DMA32
+#define IFDEF_ZONE_DMA32(X) X
+#else
+#define IFDEF_ZONE_DMA32(X)
+#endif
+
+#ifdef CONFIG_HIGHMEM
+#define IFDEF_ZONE_HIGHMEM(X) X
+#else
+#define IFDEF_ZONE_HIGHMEM(X)
+#endif
+
+#define ZONE_TYPE                                              \
+       IFDEF_ZONE_DMA(         EM (ZONE_DMA,    "DMA"))        \
+       IFDEF_ZONE_DMA32(       EM (ZONE_DMA32,  "DMA32"))      \
+                               EM (ZONE_NORMAL, "Normal")      \
+       IFDEF_ZONE_HIGHMEM(     EM (ZONE_HIGHMEM,"HighMem"))    \
+                               EMe(ZONE_MOVABLE,"Movable")
+
 /*
  * First define the enums in the above macros to be exported to userspace
  * via TRACE_DEFINE_ENUM().
@@ -28,6 +53,7 @@
 #define EMe(a, b)      TRACE_DEFINE_ENUM(a);
 
 COMPACTION_STATUS
+ZONE_TYPE
 
 /*
  * Now redefine the EM() and EMe() macros to map the enums to the strings
@@ -230,21 +256,21 @@ DECLARE_EVENT_CLASS(mm_compaction_suitable_template,
 
        TP_STRUCT__entry(
                __field(int, nid)
-               __field(char *, name)
+               __field(enum zone_type, idx)
                __field(int, order)
                __field(int, ret)
        ),
 
        TP_fast_assign(
                __entry->nid = zone_to_nid(zone);
-               __entry->name = (char *)zone->name;
+               __entry->idx = zone_idx(zone);
                __entry->order = order;
                __entry->ret = ret;
        ),
 
        TP_printk("node=%d zone=%-8s order=%d ret=%s",
                __entry->nid,
-               __entry->name,
+               __print_symbolic(__entry->idx, ZONE_TYPE),
                __entry->order,
                __print_symbolic(__entry->ret, COMPACTION_STATUS))
 );
@@ -276,7 +302,7 @@ DECLARE_EVENT_CLASS(mm_compaction_defer_template,
 
        TP_STRUCT__entry(
                __field(int, nid)
-               __field(char *, name)
+               __field(enum zone_type, idx)
                __field(int, order)
                __field(unsigned int, considered)
                __field(unsigned int, defer_shift)
@@ -285,7 +311,7 @@ DECLARE_EVENT_CLASS(mm_compaction_defer_template,
 
        TP_fast_assign(
                __entry->nid = zone_to_nid(zone);
-               __entry->name = (char *)zone->name;
+               __entry->idx = zone_idx(zone);
                __entry->order = order;
                __entry->considered = zone->compact_considered;
                __entry->defer_shift = zone->compact_defer_shift;
@@ -294,7 +320,7 @@ DECLARE_EVENT_CLASS(mm_compaction_defer_template,
 
        TP_printk("node=%d zone=%-8s order=%d order_failed=%d consider=%u limit=%lu",
                __entry->nid,
-               __entry->name,
+               __print_symbolic(__entry->idx, ZONE_TYPE),
                __entry->order,
                __entry->order_failed,
                __entry->considered,