On Mon, 26 Mar 2018, Andi Kleen wrote:

quoted

Aside: should there be a new spec_flt field for struct task_struct that 
complements maj_flt and min_flt and be exported through /proc/pid/stat?

No. task_struct is already too bloated. If you need per process tracking 
you can always get it through trace points.

Hi Andi,

We have

	count_vm_event(PGFAULT);
	count_memcg_event_mm(vma->vm_mm, PGFAULT);

in handle_mm_fault() but not counterpart for spf.  I think it would be 
helpful to be able to determine how much faulting can be done 
speculatively if there is no per-process tracking without tracing.