mm/page_isolation.c: add new tracepoint, test_pages_isolated

#undef TRACE_SYSTEM

#define TRACE_SYSTEM page_isolation

#if !defined(_TRACE_PAGE_ISOLATION_H) || defined(TRACE_HEADER_MULTI_READ)

#define _TRACE_PAGE_ISOLATION_H

#include <linux/tracepoint.h>

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_PAGE_ISOLATION_H */

/* This part must be outside protection */

#include <trace/define_trace.h>

#include <linux/hugetlb.h>

#include "internal.h"

#define CREATE_TRACE_POINTS

#include <trace/events/page_isolation.h>

static int set_migratetype_isolate(struct page *page,

				bool skip_hwpoisoned_pages)

{

						skip_hwpoisoned_pages);

	spin_unlock_irqrestore(&zone->lock, flags);

	trace_test_pages_isolated(start_pfn, end_pfn, pfn);

	return pfn < end_pfn ? -EBUSY : 0;

}