linux-kernel - Re: [PATCH v2 2/2] tracing: Create generic syscall TRACE

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Date:	Fri, 21 Aug 2009 13:57:38 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	Josh Stone <jistone@...hat.com>
Cc:	linux-kernel@...r.kernel.org, fweisbec@...il.com, mingo@...e.hu,
	laijs@...fujitsu.com, rostedt@...dmis.org, peterz@...radead.org,
	mathieu.desnoyers@...ymtl.ca, jiayingz@...gle.com,
	mbligh@...gle.com, lizf@...fujitsu.com
Subject: Re: [PATCH v2 2/2] tracing: Create generic syscall TRACE_EVENTs

On Thu, Aug 20, 2009 at 12:09:33PM -0700, Josh Stone wrote:
> This converts the syscall_enter/exit tracepoints into TRACE_EVENTs, so
> you can have generic ftrace events that capture all system calls with
> arguments and return values.  These generic events are also renamed to
> sys_enter/exit, so they're more closely aligned to the specific
> sys_enter_foo events.
> 
> Signed-off-by: Josh Stone <jistone@...hat.com>
> Cc: Jason Baron <jbaron@...hat.com>
> ---
>  arch/s390/kernel/ptrace.c       |    8 ++--
>  arch/x86/kernel/ptrace.c        |   12 +++----
>  include/trace/events/syscalls.h |   66 +++++++++++++++++++++++++++++++++++++++
>  include/trace/syscall.h         |   13 --------
>  kernel/trace/trace_syscalls.c   |   17 +++++-----
>  5 files changed, 84 insertions(+), 32 deletions(-)
>  create mode 100644 include/trace/events/syscalls.h
> 
> diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
> index 26194b0..8e578a9 100644
> --- a/arch/s390/kernel/ptrace.c
> +++ b/arch/s390/kernel/ptrace.c
> @@ -51,8 +51,8 @@
>  #include "compat_ptrace.h"
>  #endif
>  
> -DEFINE_TRACE_WITH_CALLBACK(syscall_enter, syscall_regfunc, syscall_unregfunc);
> -DEFINE_TRACE_WITH_CALLBACK(syscall_exit, syscall_regfunc, syscall_unregfunc);
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/syscalls.h>
>  
>  enum s390_regset {
>  	REGSET_GENERAL,
> @@ -665,7 +665,7 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
>  	}
>  
>  	if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE)))
> -		trace_syscall_enter(regs, regs->gprs[2]);
> +		trace_sys_enter(regs, regs->gprs[2]);
>  
>  	if (unlikely(current->audit_context))
>  		audit_syscall_entry(is_compat_task() ?
> @@ -683,7 +683,7 @@ asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
>  				   regs->gprs[2]);
>  
>  	if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE)))
> -		trace_syscall_exit(regs, regs->gprs[2]);
> +		trace_sys_exit(regs, regs->gprs[2]);
>  
>  	if (test_thread_flag(TIF_SYSCALL_TRACE))
>  		tracehook_report_syscall_exit(regs, 0);
> diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
> index 692fc14..dc87a04 100644
> --- a/arch/x86/kernel/ptrace.c
> +++ b/arch/x86/kernel/ptrace.c
> @@ -35,13 +35,11 @@
>  #include <asm/proto.h>
>  #include <asm/ds.h>
>  
> -#include <trace/syscall.h>
> -
> -DEFINE_TRACE_WITH_CALLBACK(syscall_enter, syscall_regfunc, syscall_unregfunc);
> -DEFINE_TRACE_WITH_CALLBACK(syscall_exit, syscall_regfunc, syscall_unregfunc);
> -
>  #include "tls.h"
>  
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/syscalls.h>
> +
>  enum x86_regset {
>  	REGSET_GENERAL,
>  	REGSET_FP,
> @@ -1501,7 +1499,7 @@ asmregparm long syscall_trace_enter(struct pt_regs *regs)
>  		ret = -1L;
>  
>  	if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE)))
> -		trace_syscall_enter(regs, regs->orig_ax);
> +		trace_sys_enter(regs, regs->orig_ax);
>  
>  	if (unlikely(current->audit_context)) {
>  		if (IS_IA32)
> @@ -1527,7 +1525,7 @@ asmregparm void syscall_trace_leave(struct pt_regs *regs)
>  		audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
>  
>  	if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE)))
> -		trace_syscall_exit(regs, regs->ax);
> +		trace_sys_exit(regs, regs->ax);
>  
>  	if (test_thread_flag(TIF_SYSCALL_TRACE))
>  		tracehook_report_syscall_exit(regs, 0);
> diff --git a/include/trace/events/syscalls.h b/include/trace/events/syscalls.h
> new file mode 100644
> index 0000000..9cd78fc
> --- /dev/null
> +++ b/include/trace/events/syscalls.h
> @@ -0,0 +1,66 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM syscalls
> +
> +#if !defined(_TRACE_EVENTS_SYSCALLS_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_EVENTS_SYSCALLS_H
> +
> +#include <linux/tracepoint.h>
> +
> +#include <asm/ptrace.h>
> +#include <asm/syscall.h>
> +
> +extern void syscall_regfunc(void);
> +extern void syscall_unregfunc(void);
> +
> +
> +TRACE_EVENT_WITH_CALLBACK(sys_enter,

don't we want to change this to something like 'sys_enter_generic'?
otherwise, looks good.

thanks,

-Jason

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