linux-kernel - Re: [PATCH 1/3] mm, compaction: export tracepoints status strings to userspace

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Message-ID: <20150831105538.2cf4b3ae@gandalf.local.home>
Date:	Mon, 31 Aug 2015 10:55:38 -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 1/3] mm, compaction: export tracepoints status strings
 to userspace

On Thu, 27 Aug 2015 17:24:02 +0200
Vlastimil Babka <vbabka@...e.cz> wrote:

> 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
> 

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

-- Steve

> 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 | 33 +++++++++++++++++++++++++++++++--
>  mm/compaction.c                   | 11 -----------
>  2 files changed, 31 insertions(+), 13 deletions(-)
> 

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