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* [PATCH 00/10] ftrace: Add register_ftrace_direct()
@ 2019-11-08 21:28 Steven Rostedt
  2019-11-08 21:28 ` [PATCH 01/10] ftrace: Separate out the copying of a ftrace_hash from __ftrace_hash_move() Steven Rostedt
                   ` (11 more replies)
  0 siblings, 12 replies; 31+ messages in thread
From: Steven Rostedt @ 2019-11-08 21:28 UTC (permalink / raw)
  To: linux-kernel
  Cc: Ingo Molnar, Andrew Morton, X86 ML, Nadav Amit, Andy Lutomirski,
	Dave Hansen, Song Liu, Masami Hiramatsu, Peter Zijlstra,
	Daniel Bristot de Oliveira, Alexei Starovoitov, Josh Poimboeuf


Alexei mentioned that he would like a way to access the ftrace fentry
code to jump directly to a custom eBPF trampoline instead of using
ftrace regs caller, as he said it would be faster.

I proposed a new register_ftrace_direct() function that would allow
this to happen and still work with the ftrace infrastructure. I posted
a proof of concept patch here:

 https://lore.kernel.org/r/20191023122307.756b4978@gandalf.local.home

This patch series is a more complete version, and the start of the
actual implementation. I haven't run it through my full test suite but
it passes my smoke tests and some other custom tests I built.

I also realized that I need to make the sample modules depend on X86_64
as it has inlined assembly in it that requires that dependency.

This is based on 5.4-rc6 plus the permanent patches that prevent
a ftrace_ops from being disabled by /proc/sys/kernel/ftrace_enabled

Below is the tree that contains this code.

  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
ftrace/direct

Head SHA1: 9492654d091cb90a487ca669c58f802fa99bcd6f

Enjoy,

-- Steve


Steven Rostedt (VMware) (10):
      ftrace: Separate out the copying of a ftrace_hash from __ftrace_hash_move()
      ftrace: Separate out functionality from ftrace_location_range()
      ftrace: Add register_ftrace_direct()
      ftrace: Add ftrace_find_direct_func()
      ftrace: Add sample module that uses register_ftrace_direct()
      ftrace/selftest: Add tests to test register_ftrace_direct()
      ftrace: Add another example of register_ftrace_direct() use case
      ftrace/selftests: Update the direct call selftests to test two direct calls
      ftrace/x86: Add register_ftrace_direct() for custom trampolines
      ftrace/x86: Add a counter to test function_graph with direct

----
 arch/x86/Kconfig                                   |   1 +
 arch/x86/include/asm/ftrace.h                      |  13 +
 arch/x86/kernel/ftrace.c                           |  14 +
 arch/x86/kernel/ftrace_64.S                        |  33 +-
 include/linux/ftrace.h                             |  50 ++-
 kernel/trace/Kconfig                               |   8 +
 kernel/trace/ftrace.c                              | 420 +++++++++++++++++++--
 samples/Kconfig                                    |   7 +
 samples/Makefile                                   |   1 +
 samples/ftrace/Makefile                            |   4 +
 samples/ftrace/ftrace-direct-too.c                 |  51 +++
 samples/ftrace/ftrace-direct.c                     |  45 +++
 .../ftrace/test.d/direct/ftrace-direct.tc          |  69 ++++
 .../ftrace/test.d/direct/kprobe-direct.tc          |  84 +++++
 14 files changed, 759 insertions(+), 41 deletions(-)
 create mode 100644 samples/ftrace/Makefile
 create mode 100644 samples/ftrace/ftrace-direct-too.c
 create mode 100644 samples/ftrace/ftrace-direct.c
 create mode 100644 tools/testing/selftests/ftrace/test.d/direct/ftrace-direct.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc

^ permalink raw reply	[flat|nested] 31+ messages in thread

end of thread, other threads:[~2019-11-15  9:32 UTC | newest]

Thread overview: 31+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-11-08 21:28 [PATCH 00/10] ftrace: Add register_ftrace_direct() Steven Rostedt
2019-11-08 21:28 ` [PATCH 01/10] ftrace: Separate out the copying of a ftrace_hash from __ftrace_hash_move() Steven Rostedt
2019-11-08 21:28 ` [PATCH 02/10] ftrace: Separate out functionality from ftrace_location_range() Steven Rostedt
2019-11-08 21:28 ` [PATCH 03/10] ftrace: Add register_ftrace_direct() Steven Rostedt
2019-11-09  2:29   ` Alexei Starovoitov
2019-11-09 12:33     ` Steven Rostedt
2019-11-14 18:29       ` Steven Rostedt
2019-11-14 18:34         ` Alexei Starovoitov
2019-11-14 18:48           ` Steven Rostedt
2019-11-14 19:05             ` Steven Rostedt
2019-11-13 14:13   ` Miroslav Benes
2019-11-13 14:34     ` Steven Rostedt
2019-11-08 21:28 ` [PATCH 04/10] ftrace: Add ftrace_find_direct_func() Steven Rostedt
2019-11-08 21:28 ` [PATCH 05/10] ftrace: Add sample module that uses register_ftrace_direct() Steven Rostedt
2019-11-08 21:28 ` [PATCH 06/10] ftrace/selftest: Add tests to test register_ftrace_direct() Steven Rostedt
2019-11-08 21:28 ` [PATCH 07/10] ftrace: Add another example of register_ftrace_direct() use case Steven Rostedt
2019-11-08 21:28 ` [PATCH 08/10] ftrace/selftests: Update the direct call selftests to test two direct calls Steven Rostedt
2019-11-08 21:28 ` [PATCH 09/10] ftrace/x86: Add register_ftrace_direct() for custom trampolines Steven Rostedt
2019-11-14 15:34   ` Miroslav Benes
2019-11-14 16:19     ` Steven Rostedt
2019-11-15  9:32       ` Miroslav Benes
2019-11-08 21:28 ` [PATCH 10/10] ftrace/x86: Add a counter to test function_graph with direct Steven Rostedt
2019-11-08 22:51 ` [PATCH 00/10] ftrace: Add register_ftrace_direct() Josh Poimboeuf
2019-11-09  1:00   ` Steven Rostedt
2019-11-11  8:47   ` Peter Zijlstra
2019-11-11 14:15     ` Josh Poimboeuf
2019-11-13 15:10 ` Miroslav Benes
2019-11-13 16:31   ` Steven Rostedt
2019-11-14  9:05     ` Miroslav Benes
2019-11-14 14:36       ` Steven Rostedt
2019-11-14 15:42         ` Miroslav Benes

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