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From: Miroslav Benes <mbenes@suse.cz>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, 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: Re: [PATCH 00/10] ftrace: Add register_ftrace_direct()
Date: Wed, 13 Nov 2019 16:10:36 +0100 (CET)	[thread overview]
Message-ID: <alpine.LSU.2.21.1911131604170.18679@pobox.suse.cz> (raw)
In-Reply-To: <20191108212834.594904349@goodmis.org>

On Fri, 8 Nov 2019, Steven Rostedt wrote:

> 
> 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

So I tried to run the selftests and ran into the same timeout issue we had 
with live patching :/

See http://lkml.kernel.org/r/20191025115041.23186-1-mbenes@suse.cz for a possible solution.

Miroslav

  parent reply	other threads:[~2019-11-13 15:10 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
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 [this message]
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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