linux-kernel - Re: [PATCH v3 2/5] mm/compaction: enhance tracepoint output for compaction begin/end

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Date:	Thu, 15 Jan 2015 17:16:27 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/5] mm/compaction: enhance tracepoint output for
 compaction begin/end

On Thu, 15 Jan 2015 16:41:10 +0900 Joonsoo Kim <iamjoonsoo.kim@....com> wrote:

> We now have tracepoint for begin event of compaction and it prints
> start position of both scanners, but, tracepoint for end event of
> compaction doesn't print finish position of both scanners. It'd be
> also useful to know finish position of both scanners so this patch
> add it. It will help to find odd behavior or problem on compaction
> internal logic.
> 
> And, mode is added to both begin/end tracepoint output, since
> according to mode, compaction behavior is quite different.
> 
> And, lastly, status format is changed to string rather than
> status number for readability.
> 
> ...
>
> +	TP_printk("zone_start=0x%lx migrate_pfn=0x%lx free_pfn=0x%lx zone_end=0x%lx, mode=%s status=%s",
> +		__entry->zone_start,
> +		__entry->migrate_pfn,
> +		__entry->free_pfn,
> +		__entry->zone_end,
> +		__entry->sync ? "sync" : "async",
> +		compaction_status_string[__entry->status])
>  );
>  
>  #endif /* _TRACE_COMPACTION_H */
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 546e571..2d86a20 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -19,6 +19,14 @@
>  #include "internal.h"
>  
>  #ifdef CONFIG_COMPACTION
> +char *compaction_status_string[] = {
> +	"deferred",
> +	"skipped",
> +	"continue",
> +	"partial",
> +	"complete",
> +};

compaction_status_string[] is unreferenced if tracing is disabled -
more ifdeffery is needed?
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