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

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Message-ID: <20151110002220.GB13894@js1304-P5Q-DELUXE>
Date:	Tue, 10 Nov 2015 09:22:20 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	David Rientjes <rientjes@...gle.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
Subject: Re: [PATCH 2/3] mm/cma: add new tracepoint, test_pages_isolated

On Mon, Nov 09, 2015 at 02:59:39PM -0800, David Rientjes wrote:
> 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?

Okay. I will make it enabled on CONFIG_MEMORY_ISOLATION so that
CONFIG_CMA || CONFIG_MEMORY_HOTREMOVE || CONFIG_MEMORY_FAILURE can
get benefit from it.

Thanks.
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