Linux Virtualization - Mar 2023 - [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 at redhat.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?
Acked-by: Michael S. Tsirkin <mst at redhat.com>

if you want the virtio patches through my tree after all, let me know.
> ---
> 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