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mm, compaction: export tracepoints status strings to userspace

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Some compaction tracepoints convert the integer return values to strings
using the compaction_status_string array.  This works for in-kernel
printing, but not userspace trace printing of raw captured trace such as
via trace-cmd report.

This patch converts the private array to appropriate tracepoint macros
that result in proper userspace support.

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

after:
transhuge-stres-4235  [000]   453.149280: mm_compaction_finished: node=0
  zone=ffffffff81815d7a 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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vlastimil Babka 2015-11-05 18:47:56 -08:00 • committed by Linus Torvalds
parent 840807a8f4
commit fa6c7b46aa
3 changed files with 32 additions and 14 deletions
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2
include/linux/compaction.h
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@ -15,7 +15,7 @@
/* For more detailed tracepoint output */
#define COMPACT_NO_SUITABLE_PAGE 5
#define COMPACT_NOT_SUITABLE_ZONE 6
/* When adding new state, please change compaction_status_string, too */
/* When adding new states, please adjust include/trace/events/compaction.h */
/* Used to signal whether compaction detected need_sched() or lock contention */
/* No contention detected */