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

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Date:	Mon, 31 Aug 2015 17:27:14 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Steven Rostedt <rostedt@...dmis.org>
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 08/31/2015 04:55 PM, Steven Rostedt wrote:
> 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>

Thanks!

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