linux-kernel - Re: [PATCH v2 0/6] use canonical ftrace path whenever possible

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Message-ID: <20230321223139-mutt-send-email-mst@kernel.org>
Date:   Tue, 21 Mar 2023 22:32:46 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Ross Zwisler <zwisler@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Ross Zwisler <zwisler@...gle.com>,
        "Tobin C. Harding" <me@...in.cc>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jason Wang <jasowang@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Tycho Andersen <tycho@...ho.pizza>, kvm@...r.kernel.org,
        linux-hardening@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-mm@...ck.org, virtualization@...ts.linux-foundation.org,
        linux-trace-kernel@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v2 0/6] use canonical ftrace path whenever possible

On Wed, Feb 15, 2023 at 03:33:44PM -0700, Ross Zwisler wrote:
> Changes in v2:
>  * Dropped patches which were pulled into maintainer trees.
>  * Split BPF patches out into another series targeting bpf-next.
>  * trace-agent now falls back to debugfs if tracefs isn't present.
>  * Added Acked-by from mst@...hat.com to series.
>  * Added a typo fixup for the virtio-trace README.
> 
> Steven, assuming there are no objections, would you feel comfortable
> taking this series through your tree?

for merging up to patch 5 through another tree:

Acked-by: Michael S. Tsirkin <mst@...hat.com>

I'll merge patch 6, no problem.


> ---
> The canonical location for the tracefs filesystem is at /sys/kernel/tracing.
> 
> But, from Documentation/trace/ftrace.rst:
> 
>   Before 4.1, all ftrace tracing control files were within the debugfs
>   file system, which is typically located at /sys/kernel/debug/tracing.
>   For backward compatibility, when mounting the debugfs file system,
>   the tracefs file system will be automatically mounted at:
> 
>   /sys/kernel/debug/tracing
> 
> There are many places where this older debugfs path is still used in
> code comments, selftests, examples and tools, so let's update them to
> avoid confusion.
> 
> I've broken up the series as best I could by maintainer or directory,
> and I've only sent people the patches that I think they care about to
> avoid spamming everyone.
> 
> Ross Zwisler (6):
>   tracing: always use canonical ftrace path
>   selftests: use canonical ftrace path
>   leaking_addresses: also skip canonical ftrace path
>   tools/kvm_stat: use canonical ftrace path
>   tools/virtio: use canonical ftrace path
>   tools/virtio: fix typo in README instructions
> 
>  include/linux/kernel.h                        |  2 +-
>  include/linux/tracepoint.h                    |  4 ++--
>  kernel/trace/Kconfig                          | 20 +++++++++----------
>  kernel/trace/kprobe_event_gen_test.c          |  2 +-
>  kernel/trace/ring_buffer.c                    |  2 +-
>  kernel/trace/synth_event_gen_test.c           |  2 +-
>  kernel/trace/trace.c                          |  2 +-
>  samples/user_events/example.c                 |  4 ++--
>  scripts/leaking_addresses.pl                  |  1 +
>  scripts/tracing/draw_functrace.py             |  6 +++---
>  tools/kvm/kvm_stat/kvm_stat                   |  2 +-
>  tools/lib/api/fs/tracing_path.c               |  4 ++--
>  .../testing/selftests/user_events/dyn_test.c  |  2 +-
>  .../selftests/user_events/ftrace_test.c       | 10 +++++-----
>  .../testing/selftests/user_events/perf_test.c |  8 ++++----
>  tools/testing/selftests/vm/protection_keys.c  |  4 ++--
>  tools/tracing/latency/latency-collector.c     |  2 +-
>  tools/virtio/virtio-trace/README              |  4 ++--
>  tools/virtio/virtio-trace/trace-agent.c       | 12 +++++++----
>  19 files changed, 49 insertions(+), 44 deletions(-)
> 
> -- 
> 2.39.1.637.g21b0678d19-goog