Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions

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To: Steven Rostedt <rostedt@xxxxxxxxxxx>
Subject: Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Fri, 3 May 2019 18:35:27 +0200
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Linux List Kernel Mailing <linux-kernel@xxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Nicolai Stange <nstange@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Jiri Kosina <jikos@xxxxxxxxxx>, Miroslav Benes <mbenes@xxxxxxx>, Petr Mladek <pmladek@xxxxxxxx>, Joe Lawrence <joe.lawrence@xxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>, Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>, Mimi Zohar <zohar@xxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, Nayna Jain <nayna@xxxxxxxxxxxxx>, Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>, Joerg Roedel <jroedel@xxxxxxx>, "open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@xxxxxxxxxxxxxxx>, stable <stable@xxxxxxxxxxxxxxx>
In-reply-to: <20190503123126.3a2801be@gandalf.local.home>
User-agent: Mutt/1.10.1 (2018-07-13)

On Fri, May 03, 2019 at 12:31:26PM -0400, Steven Rostedt wrote:
> I guess the real question is, what's the performance impact of doing
> that?

Is there anyone that considers i386 a performance platform?

Follow-Ups:
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Andy Lutomirski

References:
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Peter Zijlstra
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Linus Torvalds
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Peter Zijlstra
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Steven Rostedt
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Steven Rostedt
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Steven Rostedt
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Peter Zijlstra
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Steven Rostedt
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Andy Lutomirski
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Steven Rostedt

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