linux-kernel - Re: [PATCHv2 bpf 3/3] bpf: Force cookies array to follow symbols sorting

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Message-ID: <20220608120830.1ff5c5eb@gandalf.local.home>
Date:   Wed, 8 Jun 2022 12:08:30 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Jiri Olsa <olsajiri@...il.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, lkml <linux-kernel@...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>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCHv2 bpf 3/3] bpf: Force cookies array to follow symbols
 sorting

On Wed, 8 Jun 2022 08:59:50 -0700
Andrii Nakryiko <andrii.nakryiko@...il.com> wrote:

> Would it be possible to preprocess ftrace_pages to remove such invalid
> records (so that by the time we have to report
> available_filter_functions there are no invalid records)? Or that data
> is read-only when kernel is running?

It's possible, but will be time consuming (slow down boot up) and racy. In
other words, I didn't feel it was worth it.

We can add it. How much of an issue is it to have these place holders for
you? Currently, I only see it causes issues with tests. Is it really an
issue for use cases?

-- Steve