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

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Date:	Mon, 31 Aug 2015 11:32:57 -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>

Reviewed-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve

> 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(-)
> 
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