linux-kernel - Re: [RFC PATCH v3 0/3] Introduce BPF map tracing capability

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Message-ID: <CAADnVQ+62fOzO8nS_rbTqkFtfWGj06bT1XDUFhdAxY8Lx3OR4g@mail.gmail.com>
Date:   Wed, 3 Nov 2021 21:27:09 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     Joe Burton <jevburton.kernel@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Petar Penkov <ppenkov@...gle.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Joe Burton <jevburton@...gle.com>
Subject: Re: [RFC PATCH v3 0/3] Introduce BPF map tracing capability

On Wed, Nov 3, 2021 at 9:23 PM Yonghong Song <yhs@...com> wrote:
>
> I checked with a few llvm compiler engineers in Facebook.
> They mentioned there is nothing preventing compiler from doing
> optimization like poking inside the noinline function and doing
> some optimization based on that knowledge.

Interesting. Thanks for digging in.
Good to know!