linux-kernel - Re: [PATCH v2] x86: page: get

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Message-ID: <4D90E539.7060908@zytor.com>
Date:	Mon, 28 Mar 2011 12:44:57 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Maksym Planeta <mcsim.planeta@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, mingo@...hat.com,
	kernel-janitors@...r.kernel.org, namhyung@...il.com,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Jan Beulich <JBeulich@...ell.com>
Subject: Re: [PATCH v2] x86: page: get_order() optimization

On 03/28/2011 12:33 PM, Maksym Planeta wrote:
> 
> Here is disassembly of patched get_order() with "inline" from
> "kernel/kexec.c":
> 
>      a6c:       48 8b 5d c8             mov    -0x38(%rbp),%rbx
>      a70:       e8 0b fd ff ff          callq  780 <get_order.clone.7>
> 
> 0000000000000780 <get_order.clone.7>:
>      780:       55                      push   %rbp
>      781:       b8 01 00 00 00          mov    $0x1,%eax
>      786:       48 89 e5                mov    %rsp,%rbp
>      789:       c9                      leaveq 
>      78a:       c3                      retq   
> 
> My version of gcc is gcc (Debian 4.5.2-4) 4.5.2, probably I should
> upgrade my gcc version for better inline expansions.
> 

With what options?

	-hpa
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