linux-kernel - Re: [PATCH RFC] hist lookups

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Date:   Mon, 19 Nov 2018 10:14:21 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     David Miller <davem@...emloft.net>
Cc:     acme@...nel.org, linux-kernel@...r.kernel.org, namhyung@...nel.org,
        jolsa@...nel.org
Subject: Re: [PATCH RFC] hist lookups

On Sun, Nov 18, 2018 at 08:52:43PM -0800, David Miller wrote:
> From: Jiri Olsa <jolsa@...hat.com>
> 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.
> 

cool, I'll polish the patchset and send it out

thanks,
jirka