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SubjectRe: [PATCH 2/3] mm, compaction: export tracepoints zone names to userspace
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On 08/31/2015 04:58 PM, Steven Rostedt wrote:
> On Thu, 27 Aug 2015 17:24:03 +0200
> Vlastimil Babka <vbabka@suse.cz> wrote:
>
>> 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>
>> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
>> Cc: Steven Rostedt <rostedt@goodmis.org>
>> Cc: Ingo Molnar <mingo@redhat.com>
>> Cc: Mel Gorman <mgorman@suse.de>
>> Cc: David Rientjes <rientjes@google.com>
>> ---
>> include/trace/events/compaction.h | 38 ++++++++++++++++++++++++++++++++------
>> 1 file changed, 32 insertions(+), 6 deletions(-)
>>
>> diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h
>> index 1275a55..8daa8fa 100644
>> --- 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_ZONE_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")
>> +
>
> Hmm, have you tried to compile this with CONFIG_ZONE_HIGHMEM disabled,
> and CONFIG_ZONE_DMA and/or CONFIG_ZONE_DMA32 enabled?

Yep, that's standard x86_64 situation (highmem disabled, dma+dma32 enabled).

> The EMe() macro must come last, as it doesn't have the ending comma and
> the __print_symbolic() can fail to compile due to it.

Thanks to ZONE_MOVABLE being unconditional, EMe(ZONE_MOVABLE...) is
always last. Otherwise the macros would get even more ugly...

> -- Steve
>
>
>> /*
>> * First define the enums in the above macros to be exported to userspace
>> * via TRACE_DEFINE_ENUM().
>> @@ -28,6 +53,7 @@



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