linux-kernel - Re: [PATCH 2/3] mm, compaction: export tracepoints zone names to userspace

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Date:	Mon, 31 Aug 2015 10:58:34 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Ingo Molnar <mingo@...hat.com>, Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 2/3] mm, compaction: export tracepoints zone names to
 userspace

On Thu, 27 Aug 2015 17:24:03 +0200
Vlastimil Babka <vbabka@...e.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@...e.cz>
> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: David Rientjes <rientjes@...gle.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?

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.

-- 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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