Re: [PATCH v1 0/2] perf stat: Support --all-kernel and --all-user

[Andi Kleen]

On Sun, Sep 29, 2019 at 05:29:13PM +0200, Jiri Olsa wrote:
> On Wed, Sep 25, 2019 at 10:02:16AM +0800, Jin Yao wrote:
> > This patch series supports the new options "--all-kernel" and "--all-user"
> > in perf-stat.
> > 
> > For example,
> > 
> > root@kbl:~# perf stat -e cycles,instructions --all-kernel --all-user -a -- sleep 1
> > 
> >  Performance counter stats for 'system wide':
> > 
> >         19,156,665      cycles:k
> >          7,265,342      instructions:k            #    0.38  insn per cycle
> >      4,511,186,293      cycles:u
> >        121,881,436      instructions:u            #    0.03  insn per cycle
> 
> hi,
> I think we should follow --all-kernel/--all-user behaviour from record
> command, adding extra events seems like unnecesary complexity to me

I think it's useful. Makes it easy to do kernel/user break downs.
perf record should support the same.

-Andi