Re: [PATCH RFC] hist lookups

[David Miller]

From: Namhyung Kim <namhyung@xxxxxxxxxx>
Date: Mon, 19 Nov 2018 15:28:37 +0900

> Hello David,
> 
> On Sun, Nov 18, 2018 at 08:52:43PM -0800, David Miller wrote:
>> 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.
> 
> Did you record callchains as well?  I'd like to know whether it's
> related to the children (cumulative) mode or not.

I did not have callchains on, just plain "./perf top"