From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
X86 ML <x86@kernel.org>, Nadav Amit <nadav.amit@gmail.com>,
Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Song Liu <songliubraving@fb.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Josh Poimboeuf <jpoimboe@redhat.com>
Subject: [PATCH 00/10] ftrace: Add register_ftrace_direct()
Date: Fri, 08 Nov 2019 16:28:34 -0500 [thread overview]
Message-ID: <20191108212834.594904349@goodmis.org> (raw)
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
next reply other threads:[~2019-11-08 21:34 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-08 21:28 Steven Rostedt [this message]
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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