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

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Message-ID: <20181119071647.GC20153@sejong>
Date:   Mon, 19 Nov 2018 16:16:47 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     David Miller <davem@...emloft.net>
Cc:     jolsa@...hat.com, acme@...nel.org, linux-kernel@...r.kernel.org,
        jolsa@...nel.org, kernel-team@....com
Subject: Re: [PATCH RFC] hist lookups

On Sun, Nov 18, 2018 at 10:33:55PM -0800, David Miller wrote:
> From: Namhyung Kim <namhyung@...nel.org>
> 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@...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.
> > 
> > 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"

OK, I need to think about it more..

Thanks,
Namhyung