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

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Date:	Mon, 5 Jan 2009 19:57:50 +0200
From:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] kmemtrace: Use tracepoints instead of markers.

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

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