linux-kernel - Re: [PATCHv3 bpf-next 0/9] mm/bpf/perf: Store build id in file object

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Date:   Sat, 18 Mar 2023 09:33:49 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Hao Luo <haoluo@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        bpf@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Namhyung Kim <namhyung@...il.com>,
        Dave Chinner <david@...morbit.com>
Subject: Re: [PATCHv3 bpf-next 0/9] mm/bpf/perf: Store build id in file object

On Thu, Mar 16, 2023 at 05:34:41PM +0000, Matthew Wilcox wrote:
> On Thu, Mar 16, 2023 at 06:01:40PM +0100, Jiri Olsa wrote:
> > hi,
> > this patchset adds build id object pointer to struct file object.
> > 
> > We have several use cases for build id to be used in BPF programs
> > [2][3].
> 
> Yes, you have use cases, but you never answered the question I asked:
> 
> Is this going to be enabled by every distro kernel, or is it for special
> use-cases where only people doing a very specialised thing who are
> willing to build their own kernels will use it?

I hope so, but I guess only time tell.. given the response by Ian and Andrii
there are 3 big users already

> 
> Saying "hubble/tetragon" doesn't answer that question.  Maybe it does
> to you, but I have no idea what that software is.
> 
> Put it another way: how does this make *MY* life better?  Literally me.
> How will it affect my life?

sorry, I'm  not sure how to answer this.. there're possible users of the
feature and the price seems to be reasonable to me, but of course I understand
file/inode objects are tricky to mess with

jirka