Re: [PATCH RFC] hist lookups

[David Miller]

From: Jiri Olsa <jolsa@xxxxxxxxxx>
Date: Tue, 13 Nov 2018 11:40:54 +0100

> I pushed/rebased what I have to perf/fixes branch again
> 
> please note I had to change our compile changes, because
> they wouldn't compile on x86, but I can't verify on sparc,
> so you might see some compile fails again

I just checked your current perf/fixes branch.

It builds on Sparc ;-)

And it behaves better too.  I do get tons of drops and lost events,
but it seems to keep going even during the hardest load.

Eventually I end up with a lot of unresolvable histogram entries,
so that is something to look into.

I looked at your drop logic and it seems perfect, we avoid dropping
all non-SAMPLE events which is what we want.  So that can't be the
cause of the issues I am seeing.