On 12/02/2015 02:53 PM, Yang Shi wrote: > diff --git a/mm/gup.c b/mm/gup.c > index deafa2c..10245a4 100644 > --- a/mm/gup.c > +++ b/mm/gup.c > @@ -13,6 +13,9 @@ > #include <linux/rwsem.h> > #include <linux/hugetlb.h> > > +#define CREATE_TRACE_POINTS > +#include <trace/events/gup.h> > + > #include <asm/pgtable.h> > #include <asm/tlbflush.h> This needs to be _the_ last thing that gets #included. Otherwise, you risk colliding with any other trace header that gets implicitly included below. > @@ -1340,6 +1346,8 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write, > start, len))) > return 0; > > + trace_gup_get_user_pages_fast(start, nr_pages, write, pages); > + > /* > * Disable interrupts. We use the nested form as we can already have > * interrupts disabled by get_futex_key. It would be _really_ nice to be able to see return values from the various gup calls as well. Is that feasible? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>