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Date:   Wed, 4 Sep 2019 11:41:46 -0400
From:   Joel Fernandes <joel@joelfernandes.org>
To:     Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
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        Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
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        Andy Lutomirski <luto@kernel.org>,
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        X86 ML <x86@kernel.org>, Qais Yousef <qais.yousef@arm.com>
Subject: Re: [PATCH 2/2] sched/debug: add sched_update_nr_running tracepoint
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On Wed, Sep 04, 2019 at 08:37:22AM -0700, Alexei Starovoitov wrote:
> On Wed, Sep 4, 2019 at 8:33 AM Joel Fernandes <joel@joelfernandes.org> wrote:
> >
> > On Wed, Sep 04, 2019 at 08:26:52AM -0700, Alexei Starovoitov wrote:
> > > On Wed, Sep 4, 2019 at 6:14 AM Joel Fernandes <joel@joelfernandes.org> wrote:
> > > >
> > > > True. However, for kprobes-based BPF program - it does check for kernel
> > > > version to ensure that the BPF program is built against the right kernel
> > > > version (in order to ensure the program is built against the right set of
> > > > kernel headers). If it is not, then BPF refuses to load the program.
> > >
> > > This is not true anymore. Users found few ways to workaround that check
> > > in practice. It became useless and it was deleted some time ago.
> >
> > Wow, Ok! Interesting!
> 
> the other part of your email says about kernel header requirement.
> This is not true any more as well :)
> BTF relocations are already supported by the kernel, llvm, libbpf,
> bpftool, pahole.
> We'll be posting sample code soon.

Ok, this landscape seems to be changing quite a bit. I was going by what I
already know... Looking forward to catching up with the latest. Sorry,

thanks,

 - Joel