linux-kernel - Re: [PATCH 2/5] add buffer cache information to show_free

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Message-ID: <28c262360907050716x28671070of7ab21556213b337@mail.gmail.com>
Date:	Sun, 5 Jul 2009 23:16:27 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 2/5] add buffer cache information to show_free_areas()

On Sun, Jul 5, 2009 at 6:24 PM, KOSAKI
Motohiro<kosaki.motohiro@...fujitsu.com> wrote:
> Subject: [PATCH] add buffer cache information to show_free_areas()
>
> When administrator analysis memory shortage reason from OOM log, They
> often need to know rest number of cache like pages.
>
> Then, show_free_areas() shouldn't only display page cache, but also it
> should display buffer cache.
>
>
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> ---
>  mm/page_alloc.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> Index: b/mm/page_alloc.c
> ===================================================================
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -2118,7 +2118,7 @@ void show_free_areas(void)
>        printk("Active_anon:%lu active_file:%lu inactive_anon:%lu\n"
>                " inactive_file:%lu"
>                " unevictable:%lu"
> -               " dirty:%lu writeback:%lu unstable:%lu\n"
> +               " dirty:%lu writeback:%lu buffer:%lu unstable:%lu\n"
>                " free:%lu slab_reclaimable:%lu slab_unreclaimable:%lu\n"
>                " mapped:%lu pagetables:%lu bounce:%lu\n",
>                global_page_state(NR_ACTIVE_ANON),
> @@ -2128,6 +2128,7 @@ void show_free_areas(void)
>                global_page_state(NR_UNEVICTABLE),
>                global_page_state(NR_FILE_DIRTY),
>                global_page_state(NR_WRITEBACK),
> +               K(nr_blockdev_pages()),

Why do you show the number with kilobyte unit ?
Others are already number of pages.

Do you have any reason ?


-- 
Kind regards,
Minchan Kim
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