linux-kernel - Re: [PATCH v2 1/3] page-types: learn to describe flags directly from command line

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Date:	Fri, 6 Nov 2009 10:13:55 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Alex Chiang <achiang@...com>
Cc:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"Li, Haicheng" <haicheng.li@...el.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andi Kleen <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] page-types: learn to describe flags directly
	from command line

On Fri, Nov 06, 2009 at 04:21:16AM +0800, Alex Chiang wrote:
> From: Wu Fengguang <fengguang.wu@...el.com>
> 
> Teach page-types to describe page flags directly from the command
> line.
> 
> Why is this useful? For instance, if you're using memory hotplug
> and see this in /var/log/messages:
> 
> 	kernel: removing from LRU failed 3836dd0/1/1e00000000000010
> 
> It would be nice to decode those page flags without staring at
> the source.
> 
> Example usage and output:
> 
> # Documentation/vm/page-types -d 0x10
> 0x0000000000000010	____D_____________________________	dirty
> 
> # Documentation/vm/page-types -d anon
> 0x0000000000001000	____________a_____________________	anonymous
> 
> # Documentation/vm/page-types -d anon,0x10
> 0x0000000000001010	____D_______a_____________________	dirty,anonymous

Good examples, thanks!

Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>

> [achiang@...com: documentation]
> Cc: Andi Kleen <andi@...stfloor.org>
> Cc: Haicheng Li <haicheng.li@...el.com>
> Signed-off-by: Alex Chiang <achiang@...com>
> ---
> 
>  Documentation/vm/page-types.c |   21 ++++++++++++++++++++-
>  1 files changed, 20 insertions(+), 1 deletions(-)
> 
> diff --git a/Documentation/vm/page-types.c b/Documentation/vm/page-types.c
> index 3ec4f2a..a93c28e 100644
> --- a/Documentation/vm/page-types.c
> +++ b/Documentation/vm/page-types.c
> @@ -674,6 +674,7 @@ static void usage(void)
>  	printf(
>  "page-types [options]\n"
>  "            -r|--raw                  Raw mode, for kernel developers\n"
> +"            -d|--describe flags        Describe flags\n"

"Decode flags number; Encode flags name"?

Thanks,
Fengguang
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