Re: [PATCH 3/3] kmemtrace: Use tracepoints instead of markers.

[Eduard - Gabriel Munteanu]

On Mon, Jan 05, 2009 at 11:05:34AM -0500, Mathieu Desnoyers wrote:
> Hopefully it does, especially when there are no side-effects. Can you
> also try with -Os ?
> 
> Mathieu

Here's the disassembled code when using -Os. It seems it's optimised, as
with -O2. My GCC's version is 4.3.2 (Gentoo Linux).

If you want to test yourself, the output was generated with 'objdump -d
-S -a'.

What do you think?

static void print_that(unsigned long num)
{
	printf("input << 5 == %lu\n", num);
  40062d:	48 c1 e6 05          	shl    $0x5,%rsi
  400631:	bf 5e 07 40 00       	mov    $0x40075e,%edi
  400636:	31 c0                	xor    %eax,%eax
  400638:	e8 6b fe ff ff       	callq  4004a8 <printf@plt>
	sscanf(argv[2], "%lu", &in);

	call_do_something(in);

	return 0;
}
  40063d:	5a                   	pop    %rdx
  40063e:	59                   	pop    %rcx
  40063f:	31 c0                	xor    %eax,%eax
  400641:	5b                   	pop    %rbx
  400642:	c3                   	retq   


	Eduard

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/