linux-kernel - Re: [PATCHv2 0/8] x86/ftrace: Add direct batch interface

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Date:   Wed, 13 Oct 2021 11:01:34 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>
Subject: Re: [PATCHv2 0/8] x86/ftrace: Add direct batch interface

On Fri, Oct 08, 2021 at 11:13:28AM +0200, Jiri Olsa wrote:
> hi,
> adding interface to maintain multiple direct functions
> within single calls. It's a base for follow up bpf batch
> attach functionality.
...
> ---
> Jiri Olsa (6):
>       x86/ftrace: Remove extra orig rax move
>       tracing: Add trampoline/graph selftest
>       ftrace: Add ftrace_add_rec_direct function
>       ftrace: Add multi direct register/unregister interface
>       ftrace: Add multi direct modify interface
>       ftrace/samples: Add multi direct interface test module
> 
> Steven Rostedt (VMware) (2):
>       x86/ftrace: Remove fault protection code in prepare_ftrace_return
>       x86/ftrace: Make function graph use ftrace directly
> 
>  arch/x86/include/asm/ftrace.h        |   9 +++-
>  arch/x86/kernel/ftrace.c             |  71 +++++++++++++++---------------
>  arch/x86/kernel/ftrace_64.S          |  30 +------------
>  include/linux/ftrace.h               |  26 +++++++++++
>  kernel/trace/fgraph.c                |   6 ++-
>  kernel/trace/ftrace.c                | 268 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------
>  kernel/trace/trace_selftest.c        |  54 ++++++++++++++++++++++-
>  samples/ftrace/Makefile              |   1 +
>  samples/ftrace/ftrace-direct-multi.c |  52 ++++++++++++++++++++++
>  9 files changed, 420 insertions(+), 97 deletions(-)
>  create mode 100644 samples/ftrace/ftrace-direct-multi.c

FWIW, Steven pointed me to this thread since I posted
DYNAMIC_FTRACE_WITH_DIRECT_CALL support for s390 here:
https://lore.kernel.org/all/20211012133802.2460757-1-hca@linux.ibm.com/

Since Jiri asked for it: please feel free to add
Tested-by: Heiko Carstens <hca@...ux.ibm.com>
to all non-x86 patches.