[PATCH] Relax invalidation of TOP N counters in PGO.

[Martin Liška]

On 1/6/20 8:03 PM, Jan Hubicka wrote:
>>>> OK
>>> Actually I am not so sure about this patch - how do we ensure
>>> reproducibility in this case?
>> ISTM that anyone trying to have reproducible builds shouldn't be using
>> PGO based optimizations.
> 
> OpenSUSE does that. Builds are supposed to be reproducible + PGO is used
> for number of core packages (like GCC itself).  This was motivation of
> original Martin's change to drop TOPN values from profile more
> agressively.

I agree with Honza that we should provide as reproducible builds as possible.
On the other hand, we should not be rigid and allow a reasonable sample loss.
That's why I added a parameter that be tweaked at openSUSE side.

Note that original motivation for the patch was your PR :) So that I'm surprised
I don't like the patch much.

Martin

> 
> Honza
>>
>> jeff
>>