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SubjectRe: [patch 08/17] LTTng instrumentation - kernel


On Tue, 15 Jul 2008, Mathieu Desnoyers wrote:
>
> /*
> * Low level drivers may need that to know if they can schedule in
> @@ -601,6 +603,7 @@ asmlinkage int printk(const char *fmt, .
> int r;
>
> va_start(args, fmt);
> + trace_kernel_printk(__builtin_return_address(0));

BTW, ftrace.h has macros that let you use CALLER_ADDR0 for
__builtin_return_address. It also converts it from a pointer to a long,
but makes the code look prettier.


> r = vprintk(fmt, args);
> va_end(args);
>
> @@ -677,6 +680,9 @@ asmlinkage int vprintk(const char *fmt,
> raw_local_irq_save(flags);
> this_cpu = smp_processor_id();
>
> + trace_kernel_vprintk(__builtin_return_address(0),
> + printk_buf, printed_len);
> +
> /*
> * Ouch, printk recursed into itself!
> */

-- Steve



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