linux-kernel - Re: [PATCH 3/5] Show kernel stack usage to /proc/meminfo and OOM log

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Date:	Thu,  9 Jul 2009 11:13:25 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 3/5] Show kernel stack usage to /proc/meminfo and OOM log

> On Sun, 5 Jul 2009, KOSAKI Motohiro wrote:
> 
> > Subject: [PATCH] Show kernel stack usage to /proc/meminfo and OOM log
> >
> > if the system have a lot of thread, kernel stack consume unignorable large size
> > memory. IOW, it make a lot of unaccountable memory.
> > Tons unaccountable memory bring to harder analyse memory related trouble.
> >
> > Then, kernel stack account is useful.
> 
> The amount of memory allocated to kernel stacks can become significant and
> cause OOM conditions. However, we do not display the amount of memory
> consumed by stacks.'
> 
> Add code to display the amount of memory used for stacks in /proc/meminfo.
> 
> Reviewed-by: <cl@...ux-foundation.org>

Thanks.
I'll fix the description.


> (It may be useful to also include the stack sizes in the per zone
> information displayed when an OOM occurs).

following code in this patch mean display per-zone stack size, no?



> Index: b/mm/page_alloc.c
> ===================================================================
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -2158,6 +2158,7 @@ void show_free_areas(void)
>  			" mapped:%lukB"
>  			" slab_reclaimable:%lukB"
>  			" slab_unreclaimable:%lukB"
> +			" kernel_stack:%lukB"
>  			" pagetables:%lukB"
>  			" unstable:%lukB"
>  			" bounce:%lukB"
> @@ -2182,6 +2183,8 @@ void show_free_areas(void)
>  			K(zone_page_state(zone, NR_FILE_MAPPED)),
>  			K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)),
>  			K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)),
> +			zone_page_state(zone, NR_KERNEL_STACK) *
> +				THREAD_SIZE / 1024,
>  			K(zone_page_state(zone, NR_PAGETABLE)),
>  			K(zone_page_state(zone, NR_UNSTABLE_NFS)),
>  			K(zone_page_state(zone, NR_BOUNCE)),

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