linux-kernel - Re: LTTng "TIF_KERNEL

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Message-ID: <20090428150102.GB26546@elte.hu>
Date:	Tue, 28 Apr 2009 17:01:02 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Li Zefan <lizf@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: LTTng "TIF_KERNEL_TRACE"


* Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> Hi Ingo,
> 
> Looking at the current -tip tree, I notice that the 
> TIF_SYSCALL_FTRACE flag is only implemented for x86.
> 
> I have TIF_KERNEL_TRACE in my lttng tree which applies to all 
> architectures to do the exact same thing :
> 
> lttng-kernel-trace-thread-flag-alpha.patch
> lttng-kernel-trace-thread-flag-arm.patch
> lttng-kernel-trace-thread-flag-avr32.patch
> lttng-kernel-trace-thread-flag-blackfin.patch
> lttng-kernel-trace-thread-flag-cris.patch
> lttng-kernel-trace-thread-flag-frv.patch
> lttng-kernel-trace-thread-flag-h8300.patch
> lttng-kernel-trace-thread-flag-ia64.patch
> lttng-kernel-trace-thread-flag-m32r.patch
> lttng-kernel-trace-thread-flag-m68k.patch
> lttng-kernel-trace-thread-flag-mips.patch
> lttng-kernel-trace-thread-flag-parisc.patch
> lttng-kernel-trace-thread-flag-powerpc.patch
> lttng-kernel-trace-thread-flag-s390.patch
> lttng-kernel-trace-thread-flag-sh.patch
> lttng-kernel-trace-thread-flag-sparc.patch
> lttng-kernel-trace-thread-flag-um.patch
> lttng-kernel-trace-thread-flag-x86.patch
> lttng-kernel-trace-thread-flag-xtensa.patch
> lttng-kernel-trace-thread-flag-api.patch
> 
> Is there any way we could get this merged ?
> 
> One thing I like about the name TIF_KERNEL_TRACE compared to 
> TIF_SYSCALL_FTRACE is that it gives us a per-thread flag that 
> could eventually be used for more kernel tracing purposes than 
> just syscalls.

Yeah - TIF_KERNEL_TRACE indeed sounds more descriptive and less 
restrictive. TIF_SYSCALL_FTRACE was a bit ad-hoc.

	Ingo
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