netdev - Re: [PATCHv2 perf/core 0/7] Libbpf improvements

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Date:   Tue, 24 Jan 2017 16:50:57 -0800
From:   Joe Stringer <joe@....org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Wang Nan <wangnan0@...wei.com>, ast@...com,
        Daniel Borkmann <daniel@...earbox.net>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCHv2 perf/core 0/7] Libbpf improvements

On 24 January 2017 at 08:12, Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> Em Sun, Jan 22, 2017 at 05:11:21PM -0800, Joe Stringer escreveu:
>> Patch 1 fixes an issue when using drastically different BPF map definitions
>> inside ELFs from a client using libbpf, vs the map definition libbpf uses.
>>
>> Patches 2-4 add some simple, useful helper functions for setting prog type
>> and retrieving libbpf errors without depending on kernel headers from
>> userspace programs.
>>
>> Patches 5-7 add a new pinning functionality for maps, programs, and objects.
>> Library users may call bpf_map__pin(map, path) or bpf_program__pin(prog, path)
>> to pin maps and programs separately, or use bpf_object__pin(obj, path) to
>> pin all maps and programs from the BPF object to the path. The map and program
>> variations require a full path where it will be pinned in the filesystem,
>> and the object variation will create directories "maps/" and "progs/" under
>> the specified path, then mount each map and program under those subdirectories.
>
> Merged the ones either acked by Wang or adjusted by you to address
> Wang's remarks, the last ones introducing those __pin() methods, please
> provide users together with those APIs, preferably entries for 'perf
> test',

OK great, I'll rebase the last 3 patches and add a test to perf test
for pinning.