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

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Date:   Mon, 5 Nov 2018 21:34:47 +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 04, 2018 at 04:50:39PM -0800, David Miller wrote:
> From: Jiri Olsa <jolsa@...hat.com>
> Date: Sun, 4 Nov 2018 21:18:21 +0100
> 
> > do you have some code I could check on?
> 
> All I have is this patch which parallelizes the mmap readers in perf
> top.

I put something together.. still testing, but it's already
showing 0 lost events when for 'overwrite = 0' case even
for high load.. the old code shows ~1500 for same workload

I'm printing lost event counts in stdio output header:

  # perf top -d 1 --stdio
     PerfTop:    5734 irqs/sec  kernel:57.3%  exact: 100.0% lost: 0 [4000Hz cycles:ppp],  (all, 8 CPUs)

will probably add it to tui as well, seems useful

I pushed it in perf/fixes branch in:
  git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git

it's stil work in prograss.. not too manye complete changelogs ;-)

jirka