linux-kernel - Re: [PATCH 2/2] mm/page_ref: add tracepoint to track down page reference manipulation

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Date:	Mon, 15 Feb 2016 14:28:55 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:	js1304@...il.com, Andrew Morton <akpm@...ux-foundation.org>,
	Michal Nazarewicz <mina86@...a86.com>,
	Minchan Kim <minchan@...nel.org>,
	Mel Gorman <mgorman@...hsingularity.net>,
	Vlastimil Babka <vbabka@...e.cz>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Steven Rostedt <rostedt@...dmis.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 2/2] mm/page_ref: add tracepoint to track down page
 reference manipulation

On (02/15/16 14:08), Sergey Senozhatsky wrote:
> 
> will this compile with !CONFIG_TRACEPOINTS config?
> 

uh.. sorry, was composed in email client. seems the correct way to do it is

+#if defined CONFIG_DEBUG_PAGE_REF && defined CONFIG_TRACEPOINTS

 #include <linux/tracepoint-defs.h>

 #define page_ref_tracepoint_active(t) static_key_false(&(t).key)

 extern struct tracepoint __tracepoint_page_ref_set;
 ...

 extern void __page_ref_set(struct page *page, int v);
 ...

#else

 #define page_ref_tracepoint_active(t) false

 static inline void __page_ref_set(struct page *page, int v)
 {
 }
 ...

#endif



or add a dependency of PAGE_REF on CONFIG_TRACEPOINTS in Kconfig.

	-ss