linux-kernel - Re: [PATCH v3 perf, bpf-next 1/4] perf, bpf: Introduce PERF_RECORD_BPF

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Date:   Wed, 12 Dec 2018 19:05:53 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Song Liu <songliubraving@...com>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>,
        "acme@...nel.org" <acme@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v3 perf, bpf-next 1/4] perf, bpf: Introduce
 PERF_RECORD_BPF_EVENT

On Wed, Dec 12, 2018 at 05:09:17PM +0000, Song Liu wrote:
> > And while this tracks the bpf kallsyms, it does not do all kallsyms.
> > 
> > .... Oooh, I see the problem, everybody is doing their own custom
> > kallsym_{add,del}() thing, instead of having that in generic code :-(
> > 
> > This, for example, doesn't track module load/unload nor ftrace
> > trampolines, even though both affect kallsyms.
> 
> I think we can use PERF_RECORD_MMAP(or MMAP2) for module load/unload. 
> That could be separate sets of patches. 

So I would actually like to move bpf_lock/bpf_kallsyms/bpf_tree +
bpf_prog_kallsyms_*() + __bpf_address_lookup() into kernel/kallsyms.c
and also have ftrace use that.

Because currently the ftrace stuff is otherwise invisible.

A generic kallsym register/unregister for any JIT.