linux-kernel - Re: how to look for source code in kernel

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Message-ID: <CAMuHMdVo67RrcencMOTJSL_=fGjDFBtczRpvW6D8QbVxNy-t3g@mail.gmail.com>
Date:	Fri, 28 Dec 2012 23:03:40 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Borislav Petkov <bp@...en8.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	anish singh <anish198519851985@...il.com>,
	amit mehta <gmate.amit@...il.com>,
	Henrique Rodrigues <henriquesilvar@...il.com>,
	kishore kumar <kishoreopen@...il.com>,
	Jonathan Neuschäfer <j.neuschaefer@....net>,
	linux-kernel@...r.kernel.org, Kernelnewbies@...nelnewbies.org
Subject: Re: how to look for source code in kernel

On Fri, Dec 28, 2012 at 2:07 PM, Borislav Petkov <bp@...en8.de> wrote:
> On Thu, Dec 27, 2012 at 11:36:13PM -0800, Eric W. Biederman wrote:
>> git-ls-files | xargs fgrep 'struct f2fs_inode'
>>
>> That returns instantly and tells me where to look.  If you can do an
>> instant brute force search what is the point of an index?
>
> Not if you're using a lame-ass laptop with a rotating disk:
>
> $ time git ls-files | xargs grep -E 'struct mce\W*{'
> arch/x86/include/uapi/asm/mce.h:struct mce {
> arch/x86/kernel/cpu/mcheck/mce.c:               if (!final || memcmp(m, final, sizeof(struct mce))) {
>
> real    2m48.415s
> user    0m2.388s
> sys     0m15.668s

That's the first run. Now everything is in the buffer cache (assumed you have
enough RAM), and try again...

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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