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SubjectRe: [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@linux.ibm.com>
to all non-x86 patches.

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