On Thu, Mar 26, 2015 at 11:33:41AM -0700, Dave Hansen wrote: > > From: Dave Hansen <dave.han...@linux.intel.com> > > This event traces any time we go looking to unmap a bounds table > for a given virtual address range. This is useful to ensure > that the kernel actually "tried" to free a bounds table versus > times it succeeded. > > It might try and fail if it realized that a table was shared > with an adjacent VMA which is not being unmapped.
Would it make sense to extend this tracepoint to also dump the error values returned from unmap_edge_bts() and unmap_single_bt() inside mpx_unmap_tables()? > Signed-off-by: Dave Hansen <dave.han...@linux.intel.com> > --- > > b/arch/x86/include/asm/trace/mpx.h | 22 ++++++++++++++++++++++ > b/arch/x86/mm/mpx.c | 1 + > 2 files changed, 23 insertions(+) > > diff -puN arch/x86/include/asm/trace/mpx.h~mpx-trace_unmap_search > arch/x86/include/asm/trace/mpx.h > --- a/arch/x86/include/asm/trace/mpx.h~mpx-trace_unmap_search 2015-03-26 > 11:27:06.684292099 -0700 > +++ b/arch/x86/include/asm/trace/mpx.h 2015-03-26 11:27:06.689292324 > -0700 > @@ -75,6 +75,28 @@ TRACE_EVENT(mpx_unmap_zap, > ) > ); > > +TRACE_EVENT(mpx_unmap_search, > + > + TP_PROTO(unsigned long start, > + unsigned long end), > + TP_ARGS(start, end), > + > + TP_STRUCT__entry( > + __field(unsigned long, start) > + __field(unsigned long, end) > + ), > + > + TP_fast_assign( > + __entry->start = start; > + __entry->end = end; > + ), > + > + TP_printk("0x%p -> 0x%p", Interval? > + (void *)__entry->start, > + (void *)__entry->end > + ) > +); > + > #else -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/