On Tue, Feb 03, 2015 at 12:01:23PM -0500, Vince Weaver wrote:

 > @@ -237,6 +238,7 @@ enum perf_event_read_format {
 >  #define PERF_ATTR_SIZE_VER2 80      /* add: branch_sample_type */
 >  #define PERF_ATTR_SIZE_VER3 96      /* add: sample_regs_user */
 >                                      /* add: sample_stack_user */
 > +#define PERF_ATTR_SIZE_VER4 104     /* add: sample_regs_intr */

I've not given this a lot of thought before, but I'm assuming these
are the 64-bit struct sizes.  It might be interesting to also
throw some 32-bit sizes in the mix.  Who knows what horrors
lie in wait for the compat syscalls.

        Dave

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