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

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Message-ID: <YWbQObW70Vuju9hY@krava>
Date:   Wed, 13 Oct 2021 14:25:29 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Heiko Carstens <hca@...ux.ibm.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 Wed, Oct 13, 2021 at 11:01:34AM +0200, Heiko Carstens wrote:
> 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.
> 

thanks,
jirka