linux-kernel - Re: [PATCH] mm: compaction: some tracepoints should be defined only when CONFIG

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Date:   Tue, 12 Mar 2019 17:18:03 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     vbabka@...e.cz, jrdr.linux@...il.com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        shaoyafang@...iglobal.com
Subject: Re: [PATCH] mm: compaction: some tracepoints should be defined only
 when CONFIG_COMPACTION is set

On Sat 02-03-19 12:38:58, Yafang Shao wrote:
> Only mm_compaction_isolate_{free, migrate}pages may be used when
> CONFIG_COMPACTION is not set.
> All others are used only when CONFIG_COMPACTION is set.

Why is this an improvement?

> Signed-off-by: Yafang Shao <laoar.shao@...il.com>
> ---
>  include/trace/events/compaction.h | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h
> index 6074eff..3e42078 100644
> --- a/include/trace/events/compaction.h
> +++ b/include/trace/events/compaction.h
> @@ -64,6 +64,7 @@
>  	TP_ARGS(start_pfn, end_pfn, nr_scanned, nr_taken)
>  );
>  
> +#ifdef CONFIG_COMPACTION
>  TRACE_EVENT(mm_compaction_migratepages,
>  
>  	TP_PROTO(unsigned long nr_all,
> @@ -132,7 +133,6 @@
>  		__entry->sync ? "sync" : "async")
>  );
>  
> -#ifdef CONFIG_COMPACTION
>  TRACE_EVENT(mm_compaction_end,
>  	TP_PROTO(unsigned long zone_start, unsigned long migrate_pfn,
>  		unsigned long free_pfn, unsigned long zone_end, bool sync,
> @@ -166,7 +166,6 @@
>  		__entry->sync ? "sync" : "async",
>  		__print_symbolic(__entry->status, COMPACTION_STATUS))
>  );
> -#endif
>  
>  TRACE_EVENT(mm_compaction_try_to_compact_pages,
>  
> @@ -195,7 +194,6 @@
>  		__entry->prio)
>  );
>  
> -#ifdef CONFIG_COMPACTION
>  DECLARE_EVENT_CLASS(mm_compaction_suitable_template,
>  
>  	TP_PROTO(struct zone *zone,
> @@ -296,7 +294,6 @@
>  
>  	TP_ARGS(zone, order)
>  );
> -#endif
>  
>  TRACE_EVENT(mm_compaction_kcompactd_sleep,
>  
> @@ -352,6 +349,7 @@
>  
>  	TP_ARGS(nid, order, classzone_idx)
>  );
> +#endif
>  
>  #endif /* _TRACE_COMPACTION_H */
>  
> -- 
> 1.8.3.1
> 

-- 
Michal Hocko
SUSE Labs