linux-kernel - Re: [PATCH 1/5] add per-zone statistics to show_free

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Date:	Sun, 5 Jul 2009 19:05:48 +0800
From:	Wu Fengguang <fengguang.wu@...el.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>,
	Christoph Lameter <cl@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 1/5] add per-zone statistics to show_free_areas()

On Sun, Jul 05, 2009 at 05:23:35PM +0800, KOSAKI Motohiro wrote:
> Subject: [PATCH] add per-zone statistics to show_free_areas()
> 
> Currently, show_free_area() mainly display system memory usage. but it
> doesn't display per-zone memory usage information.
> 
> However, if DMA zone OOM occur, Administrator definitely need to know
> per-zone memory usage information.

DMA zone is normally lowmem-reserved. But I think the numbers still
make sense for DMA32.

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

> 
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> ---
>  mm/page_alloc.c |   20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> Index: b/mm/page_alloc.c
> ===================================================================
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -2151,6 +2151,16 @@ void show_free_areas(void)
>  			" inactive_file:%lukB"
>  			" unevictable:%lukB"
>  			" present:%lukB"
> +			" mlocked:%lukB"
> +			" dirty:%lukB"
> +			" writeback:%lukB"
> +			" mapped:%lukB"
> +			" slab_reclaimable:%lukB"
> +			" slab_unreclaimable:%lukB"
> +			" pagetables:%lukB"
> +			" unstable:%lukB"
> +			" bounce:%lukB"
> +			" writeback_tmp:%lukB"
>  			" pages_scanned:%lu"
>  			" all_unreclaimable? %s"
>  			"\n",
> @@ -2165,6 +2175,16 @@ void show_free_areas(void)
>  			K(zone_page_state(zone, NR_INACTIVE_FILE)),
>  			K(zone_page_state(zone, NR_UNEVICTABLE)),
>  			K(zone->present_pages),
> +			K(zone_page_state(zone, NR_MLOCK)),
> +			K(zone_page_state(zone, NR_FILE_DIRTY)),
> +			K(zone_page_state(zone, NR_WRITEBACK)),
> +			K(zone_page_state(zone, NR_FILE_MAPPED)),
> +			K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)),
> +			K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)),
> +			K(zone_page_state(zone, NR_PAGETABLE)),
> +			K(zone_page_state(zone, NR_UNSTABLE_NFS)),
> +			K(zone_page_state(zone, NR_BOUNCE)),
> +			K(zone_page_state(zone, NR_WRITEBACK_TEMP)),
>  			zone->pages_scanned,
>  			(zone_is_all_unreclaimable(zone) ? "yes" : "no")
>  			);
> 
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