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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