linux-kernel - Re: [PATCH v2 bpf-next 2/3] bpf: add bpffs pretty print for cgroup local storage maps

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Date:   Tue, 11 Dec 2018 17:16:12 +0000
From:   Martin Lau <kafai@...com>
To:     Roman Gushchin <guroan@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Yonghong Song <yhs@...com>, Roman Gushchin <guro@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH v2 bpf-next 2/3] bpf: add bpffs pretty print for cgroup
 local storage maps

On Mon, Dec 10, 2018 at 03:43:01PM -0800, Roman Gushchin wrote:
> Implement bpffs pretty printing for cgroup local storage maps
> (both shared and per-cpu).
> Output example (captured for tools/testing/selftests/bpf/netcnt_prog.c):
> 
> Shared:
>   $ cat /sys/fs/bpf/map_2
>   # WARNING!! The output is for debug purpose only
>   # WARNING!! The output format will change
>   {4294968594,1}: {9999,1039896}
> 
> Per-cpu:
>   $ cat /sys/fs/bpf/map_1
>   # WARNING!! The output is for debug purpose only
>   # WARNING!! The output format will change
>   {4294968594,1}: {
>   	cpu0: {0,0,0,0,0}
>   	cpu1: {0,0,0,0,0}
>   	cpu2: {1,104,0,0,0}
>   	cpu3: {0,0,0,0,0}
>   }
Acked-by: Martin KaFai Lau <kafai@...com>