linux-kernel - Re: ftrace syscalls, PowerPC: Fixes and PowerPC raw syscall tracepoint implementation

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Date:	Fri, 14 May 2010 09:55:18 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	rostedt@...dmis.org
Cc:	Ian Munsie <imunsie@....ibm.com>, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org, Jason Baron <jbaron@...hat.com>
Subject: Re: ftrace syscalls, PowerPC: Fixes and PowerPC raw syscall
 tracepoint implementation

On Thu, 2010-05-13 at 12:06 -0400, Steven Rostedt wrote:
> Frederic,
> 
> I'm fine with these patches, but since you mainly did the syscall work,
> I'll let you take them.
> 
> The patches that touch the PowerPC code needs an acked-by from Ben or
> Paul.

Done :-)

Cheers,
Ben.

> -- Steve
> 
> 
> On Thu, 2010-05-13 at 17:43 +1000, Ian Munsie wrote:
> > This patch series implements raw system call tracepoints on PowerPC that can be
> > used with ftrace and perf. Some problems with the generic ftrace syscall
> > tracepoint code have also been addressed.
> > 
> > The patches are based upon Ben's powerpc/next tree merged with tip/tracing/core
> > 
> > Patch #1 removes all ftrace syscall events that fail to map the system call
> > name from the system call metadata with the system call's number, preventing
> > the events which will not work from showing up in perf list and removing them
> > from /sys/kernel/debug/tracing/events/syscalls.
> > 
> > Patches #2 and #3 allow for archs with unusual system call tables (#2) or
> > unusual symbol names (#3) to override the appropriate functions so that they
> > can still work with ftrace syscalls.
> > 
> > Patch #4 implements the actual raw system call tracepoints that ftrace syscalls
> > builds upon, allowing all of the system calls to be used with the raw_syscalls
> > events category and most to be used with the syscalls category.
> > 
> > 
> > Not all the raw_syscalls are currently mapped to ftrace syscalls - the syscalls
> > defined in /arch/powerpc/include/asm/syscalls.h do not use the SYSCALL_DEFINE
> > class of macros and as such have no meta data, likewise some of the ppc_*
> > syscalls have assembly wrappers. These are on their way, but I wanted to put
> > the work I have done so far out first.
> > 
> > Some of those syscalls have different return types than the __SYSCALL_DEFINE
> > macro uses (unsigned long, int, time_t) and some have different prefixes (ppc,
> > ppc64) - I didn't particularly want to change them straight over without asking
> > the list first, and I certainly don't want to change the return types. I see
> > that Jason Baron ran into similar issues, but his "add compat syscall support"
> > patches have yet to be merged, and do not tackle the differing return types.
> > 
> 


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