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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Hao Luo <haoluo@google.com>
Cc: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>,
	Andrii Nakryiko <andrii.nakryiko@gmail.com>,
	Daniel Borkmann <daniel@iogearbox.net>,
	dwarves@vger.kernel.org, Yonghong Song <yhs@fb.com>
Subject: Re: [PATCH 0/2] pahole: Make encoding percpu vars into BTF optional.
Date: Fri, 18 Sep 2020 17:57:50 -0700
Message-ID: <CAADnVQL_Qudg34PpgKDz4pObwUZBJfbmKm+NcSLiQf575JcvEQ@mail.gmail.com> (raw)
In-Reply-To: <20200918204058.1030519-1-haoluo@google.com>

On Fri, Sep 18, 2020 at 1:41 PM Hao Luo <haoluo@google.com> wrote:
>
> Previous commit f3d9054ba8ff ("btf_encoder: Teach pahole to store
> percpu variables in vmlinux BTF.") introduced a feature in btf_encoder
> that encodes global symbols in BTF. However, this feature is not
> protected by any flag. In order to avoid surprises after Pahole v1.18
> rolls out, make this feature off by default and enable only upon
> request. On the kernel side, we can add a Kconfig to enable this
> new capability on an opt-in pattern.

I think I've missed some earlier discussions and motivation for opt-in.
Why opt-out is a problem?
I would think the kernel build should always include percpu vars.

  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-18 20:40 Hao Luo
2020-09-18 20:40 ` [PATCH 1/2] btf_encoder: Make encoding " Hao Luo
2020-09-18 21:24   ` Arnaldo Carvalho de Melo
2020-09-18 21:26     ` Hao Luo
2020-09-18 21:40       ` Arnaldo Carvalho de Melo
2020-09-18 20:40 ` [PATCH 2/2] btf_encoder: Introduce option '--btf_encode_force' Hao Luo
2020-09-19  0:57 ` Alexei Starovoitov [this message]
2020-09-19  4:00   ` [PATCH 0/2] pahole: Make encoding percpu vars into BTF optional Hao Luo
2020-09-21 12:27     ` Arnaldo Carvalho de Melo

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