On Mon, May 13, 2013 at 09:43:13PM +0200, Ingo Molnar wrote:
> Note that at least for user-space, REP MOVS is getting rarer. libc uses
> SSE based memcpy/memset variants - which is not miscounted by PEBS. The
> kernel still uses REP MOVS - but it's a special case because it cannot
> cheaply use vector registers.
>
> The vast majority of code gets measured by cycles:pp more accurately than
> cycles.
>
> We could try and see how many people complain. It's not like it's hard to
> undo such a change of the default event?
>
People may optimize for a wrong case instead of complaining. There is
nothing that obviously broken, only if you know what to look for the
brokenness can be seen.
--
Gleb.
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