linux-kernel - Re: [PATCH v4 0/4] tracing: tweaks for generic syscall events

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Date:	Tue, 25 Aug 2009 15:42:08 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Josh Stone <jistone@...hat.com>, linux-kernel@...r.kernel.org,
	Jason Baron <jbaron@...hat.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Martin Bligh <mbligh@...gle.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH v4 0/4] tracing: tweaks for generic syscall events

On Tue, Aug 25, 2009 at 12:28:58PM +0200, Ingo Molnar wrote:
> 
> * Frederic Weisbecker <fweisbec@...il.com> wrote:
> 
> > On Mon, Aug 24, 2009 at 02:43:10PM -0700, Josh Stone wrote:
> > > This patch series moves the callbacks for the syscall tracepoints to the
> > > definition site, and adds generic TRACE_EVENTs which capture all syscall
> > > arguments.
> > > 
> > > New in v3:
> > > - Give the thread flag a more generic name: TIF_SYSCALL_TRACEPOINT.
> > > - Move the regfuncs to arch-specific files, per Jason's suggestion.
> > > - Change _WITH_CALLBACK to just _FN, per Ingo's suggestion.
> > > 
> > > New in v4:
> > > - Give the config flag a more generic name: HAVE_SYSCALL_TRACEPOINTS.
> > > - Undo the arch reorg of the regfuncs, but conditionalize on above.
> > > 
> > > 
> > > Sample trace output:
> > >         sendmail-974   [000] 55665.464492: sys_enter: NR 14 (1, 7fff60f3af40, 7fff60f3aec0, 8, 0, 7fb1b6a05161)
> > > 
> > >         sendmail-974   [000] 55665.464496: sys_exit: NR 14 = 0
> > > 
> > >         sendmail-974   [000] 55665.464507: sys_enter: NR 23 (5, 7fff60f3b0d0, 0, 0, 7fff60f3b150, 7fff60f3ef01)
> > > 
> > >             sshd-978   [000] 55667.845359: sys_exit: NR 23 = 1
> > > 
> > >             sshd-978   [000] 55667.845373: sys_enter: NR 14 (0, 7fffc645ce90, 7fffc645cf10, 8, 0, 101010101010101)
> > > 
> > >             sshd-978   [000] 55667.845381: sys_exit: NR 14 = 0
> > > 
> > >             sshd-978   [000] 55667.845383: sys_enter: NR 14 (2, 7fffc645cf10, 0, 8, 0, 101010101010101)
> > > 
> > >             sshd-978   [000] 55667.845386: sys_exit: NR 14 = 0
> > > 
> > >             sshd-978   [000] 55667.845395: sys_enter: NR 0 (3, 7fffc6458f80, 4000, 1, 0, 0)
> > > 
> > >             sshd-978   [000] 55667.845478: sys_exit: NR 0 = 48
> > > 
> > > 
> > > Signed-off-by: Josh Stone <jistone@...hat.com>
> > > Cc: Jason Baron <jbaron@...hat.com>
> > > Cc: Frederic Weisbecker <fweisbec@...il.com>
> > > Cc: Ingo Molnar <mingo@...e.hu>
> > > Cc: Li Zefan <lizf@...fujitsu.com>
> > > Cc: Steven Rostedt <rostedt@...dmis.org>
> > > Cc: Peter Zijlstra <peterz@...radead.org>
> > > Cc: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> > > Cc: Jiaying Zhang <jiayingz@...gle.com>
> > > Cc: Martin Bligh <mbligh@...gle.com>
> > > Cc: Lai Jiangshan <laijs@...fujitsu.com>
> > > Cc: Paul Mundt <lethal@...ux-sh.org>
> > 
> > 
> > Acked-by: Frederic Weisbecker <fweisbec@...il.com>
> 
> How about compat syscalls? If we touch this code we better cover 
> them as well.
> 
> 	Ingo


They should be covered by these generic tracepoint I guess.
The remaining bits that are necessary to cover individual compat syscall
tracepoints are the missing DEFINE_SYSCALL() uses in fs/compat.c

Is someone willing to cover them?

Thanks,
Frederic.

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