>
> Instead of the condition, we could have:
>
> __entry->pfn = page ? page_to_pfn(page) : -1;
>
>
> But if there's no reason to do the tracepoint if page is NULL, then
> this patch is fine. I'm just throwing out this idea.
>
we trace only if page is valid
--- linux-next/mm/huge_memory.c Fri Nov 13 16:00:22 2015
+++ b/mm/huge_memory.c Fri Nov 13 16:26:19 2015
@@ -1987,7 +1987,8 @@ static int __collapse_huge_page_isolate(
out:
release_pte_pages(pte, _pte);
- trace_mm_collapse_huge_page_isolate(page_to_pfn(page), none_or_zero,
+ if (page)
+ trace_mm_collapse_huge_page_isolate(page_to_pfn(page),
none_or_zero,
referenced, writable, result);
return 0;
}
--
--
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