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    SubjectRe: [PATCH 3/6] tracing, page-allocator: Add trace event for page traffic related to the buddy lists
    > +TRACE_EVENT(mm_page_alloc_zone_locked,
    > +
    > + TP_PROTO(struct page *page, unsigned int order,
    > + int migratetype, int percpu_refill),
    > +
    > + TP_ARGS(page, order, migratetype, percpu_refill),
    > +
    > + TP_STRUCT__entry(
    > + __field( struct page *, page )
    > + __field( unsigned int, order )
    > + __field( int, migratetype )
    > + __field( int, percpu_refill )
    > + ),
    > +
    > + TP_fast_assign(
    > + __entry->page = page;
    > + __entry->order = order;
    > + __entry->migratetype = migratetype;
    > + __entry->percpu_refill = percpu_refill;
    > + ),
    > +
    > + TP_printk("page=%p pfn=%lu order=%u migratetype=%d cpu=%d percpu_refill=%d",
    > + __entry->page,
    > + page_to_pfn(__entry->page),
    > + __entry->order,
    > + __entry->migratetype,
    > + smp_processor_id(),

    This is the cpu when printk() is called, but not the cpu when
    this event happens.

    And this information has already been stored, and is printed
    if context-info option is set, which is set by default.

    > + __entry->percpu_refill)
    > +);
    > +
    > +TRACE_EVENT(mm_page_pcpu_drain,
    > +
    > + TP_PROTO(struct page *page, int order, int migratetype),
    > +
    > + TP_ARGS(page, order, migratetype),
    > +
    > + TP_STRUCT__entry(
    > + __field( struct page *, page )
    > + __field( int, order )
    > + __field( int, migratetype )
    > + ),
    > +
    > + TP_fast_assign(
    > + __entry->page = page;
    > + __entry->order = order;
    > + __entry->migratetype = migratetype;
    > + ),
    > +
    > + TP_printk("page=%p pfn=%lu order=%d cpu=%d migratetype=%d",
    > + __entry->page,
    > + page_to_pfn(__entry->page),
    > + __entry->order,
    > + smp_processor_id(),

    ditto

    > + __entry->migratetype)
    > +);
    > +


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