linux-kernel - Re: [PATCH 2/3] mm/cma: add new tracepoint, test_pages

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Date:	Mon, 9 Nov 2015 14:59:39 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Joonsoo Kim <js1304@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Nazarewicz <mina86@...a86.com>,
	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 2/3] mm/cma: add new tracepoint, test_pages_isolated

On Mon, 9 Nov 2015, Joonsoo Kim wrote:

> diff --git a/include/trace/events/cma.h b/include/trace/events/cma.h
> index d7cd961..82281b0 100644
> --- a/include/trace/events/cma.h
> +++ b/include/trace/events/cma.h
> @@ -60,6 +60,32 @@ TRACE_EVENT(cma_release,
>  		  __entry->count)
>  );
>  
> +TRACE_EVENT(test_pages_isolated,
> +
> +	TP_PROTO(
> +		unsigned long start_pfn,
> +		unsigned long end_pfn,
> +		unsigned long fin_pfn),
> +
> +	TP_ARGS(start_pfn, end_pfn, fin_pfn),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned long, start_pfn)
> +		__field(unsigned long, end_pfn)
> +		__field(unsigned long, fin_pfn)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->start_pfn = start_pfn;
> +		__entry->end_pfn = end_pfn;
> +		__entry->fin_pfn = fin_pfn;
> +	),
> +
> +	TP_printk("start_pfn=0x%lx end_pfn=0x%lx fin_pfn=0x%lx ret=%s",
> +		__entry->start_pfn, __entry->end_pfn, __entry->fin_pfn,
> +		__entry->end_pfn == __entry->fin_pfn ? "success" : "fail")
> +);
> +
>  #endif /* _TRACE_CMA_H */
>  
>  /* This part must be outside protection */
> diff --git a/mm/page_isolation.c b/mm/page_isolation.c
> index 6f5ae96..bda0fea 100644
> --- a/mm/page_isolation.c
> +++ b/mm/page_isolation.c
> @@ -7,6 +7,8 @@
>  #include <linux/pageblock-flags.h>
>  #include <linux/memory.h>
>  #include <linux/hugetlb.h>
> +#include <trace/events/cma.h>
> +
>  #include "internal.h"
>  
>  static int set_migratetype_isolate(struct page *page,
> @@ -268,6 +270,9 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
>  						skip_hwpoisoned_pages);
>  	spin_unlock_irqrestore(&zone->lock, flags);
>  
> +#ifdef CONFIG_CMA
> +	trace_test_pages_isolated(start_pfn, end_pfn, pfn);
> +#endif
>  	return (pfn < end_pfn) ? -EBUSY : 0;
>  }
>  

This is also used for memory offlining, so could we generalize the 
tracepoint to CONFIG_CMA || CONFIG_MEMORY_HOTREMOVE?
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