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

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Date:	Thu, 13 May 2010 12:06:11 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ian Munsie <imunsie@....ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	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

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.

-- 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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