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mm/compaction: more trace to understand when/why compaction start/finish

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It is not well analyzed that when/why compaction start/finish or not.
With these new tracepoints, we can know much more about start/finish
reason of compaction.  I can find following bug with these tracepoint.

http://www.spinics.net/lists/linux-mm/msg81582.html

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>
This commit is contained in:
Joonsoo Kim 2015-02-11 15:27:06 -08:00 • committed by Linus Torvalds
parent e34d85f0e3
commit 837d026d56
3 changed files with 111 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

74
include/trace/events/compaction.h
View file

@ -164,6 +164,80 @@ TRACE_EVENT(mm_compaction_end,
compaction_status_string[__entry->status])
);
TRACE_EVENT(mm_compaction_try_to_compact_pages,
TP_PROTO(
int order,
gfp_t gfp_mask,
enum migrate_mode mode),
TP_ARGS(order, gfp_mask, mode),
TP_STRUCT__entry(
__field(int, order)
__field(gfp_t, gfp_mask)
__field(enum migrate_mode, mode)
),
TP_fast_assign(
__entry->order = order;
__entry->gfp_mask = gfp_mask;
__entry->mode = mode;
),
TP_printk("order=%d gfp_mask=0x%x mode=%d",
__entry->order,
__entry->gfp_mask,
(int)__entry->mode)
);
DECLARE_EVENT_CLASS(mm_compaction_suitable_template,
TP_PROTO(struct zone *zone,
int order,
int ret),
TP_ARGS(zone, order, ret),
TP_STRUCT__entry(
__field(int, nid)
__field(char *, name)
__field(int, order)
__field(int, ret)
),
TP_fast_assign(
__entry->nid = zone_to_nid(zone);
__entry->name = (char *)zone->name;
__entry->order = order;
__entry->ret = ret;
),
TP_printk("node=%d zone=%-8s order=%d ret=%s",
__entry->nid,
__entry->name,
__entry->order,
compaction_status_string[__entry->ret])
);
DEFINE_EVENT(mm_compaction_suitable_template, mm_compaction_finished,
TP_PROTO(struct zone *zone,
int order,
int ret),
TP_ARGS(zone, order, ret)
);
DEFINE_EVENT(mm_compaction_suitable_template, mm_compaction_suitable,
TP_PROTO(struct zone *zone,
int order,
int ret),
TP_ARGS(zone, order, ret)
);
#endif /* _TRACE_COMPACTION_H */
/* This part must be outside protection */