netdev - Re: [bpf-next PATCH 3/3] bpf: add sample program to trace map events

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Date:   Thu, 19 Apr 2018 11:20:04 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Sebastiano Miano <sebastiano.miano@...ito.it>
Cc:     netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        mingo@...hat.com, rostedt@...dmis.org, fulvio.risso@...ito.it,
        brouer@...hat.com
Subject: Re: [bpf-next PATCH 3/3] bpf: add sample program to trace map
 events

On Wed, 18 Apr 2018 17:30:59 +0200
Sebastiano Miano <sebastiano.miano@...ito.it> wrote:

> This patch adds a sample program, called trace_map_events,
> that shows how to capture map events and filter them based on
> the map id.
> 
> The program accepts a list of map IDs, via the -i command line
> option, and filters all the map events related to those IDs (i.e.,
> map_create/update/lookup/next_key).
> If no IDs are specified, all map events are listed and no filtering
> is performed.
> 
> Sample usage:
> 
>  # trace_map_events -i <map_id1> -i <map_id2> -i <map_id3> ...
> 
> Signed-off-by: Sebastiano Miano <sebastiano.miano@...ito.it>

Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>

I have tested it works:

$ sudo ./trace_map_events -i 2
Init bpf_perf_event for cpu:0
Init bpf_perf_event for cpu:1
Init bpf_perf_event for cpu:2
Init bpf_perf_event for cpu:3
Init bpf_perf_event for cpu:4
Init bpf_perf_event for cpu:5
Waiting for map events...
LOOKUP event for map id: 2 and type: 6
Waiting for map events...
LOOKUP event for map id: 2 and type: 6
Waiting for map events...
LOOKUP event for map id: 2 and type: 6
Waiting for map events...
LOOKUP event for map id: 2 and type: 6
Waiting for map events...
LOOKUP event for map id: 2 and type: 6
Waiting for map events...
LOOKUP event for map id: 2 and type: 6
Waiting for map events...
LOOKUP event for map id: 2 and type: 6
Waiting for map events...

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer