Re: [PATCH -tip] perf_counter: Add Generalized Hardware FPU support for AMD

[Ingo Molnar <mingo@elte.hu>]

* Paul Mackerras <paulus@samba.org> wrote:

> Ingo Molnar writes:
> 
> >         19583739  vec-adds               (   2.01x scaled)
> >         20856051  vec-muls               (   2.01x scaled)
> >         20856051  vec-divs               (   2.01x scaled)
> >      25100224054  vec-idle-cycles        (   1.99x scaled)
> >         12540131  vec-busy-cycles        (   1.99x scaled)
> >         42286702  vec-ops                (   2.01x scaled)
> > 
> > Paulus: would this categorization fit PowerPC too?
> 
> Conceptually that looks nice, but unfortunately we don't have 
> events that correspond to that categorization on any PowerPC with 
> vector hardware (VMX/Altivec).  POWER6 seems to have the most 
> vector events, and they are mostly divided up along the lines of 
> simple / complex / permute / load / store operations, and whether 
> they are integer or floating-point operations.

Here's what we have on x86:

     20177177044  vec-adds                  (scaled from 66.63%)
     34101687027  vec-muls                  (scaled from 66.64%)
      3984060862  vec-divs                  (scaled from 66.71%)
     26349684710  vec-idle-cycles           (scaled from 66.65%)
      9052001905  vec-stall-cycles          (scaled from 66.66%)
     76440734242  vec-ops                   (scaled from 66.71%)

Could at least the idle/busy/stall/total generic stats be filled in 
on powerpc, with a reasonable enough approximation? Those 
utilization metrics are the most important ones when one tries to 
figure out how well utilized the vector units are.

	Ingo