linux-kernel - Re: [patch] vmstat: account page allocation failures

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Message-Id: <20110428225144.3D4D.A69D9226@jp.fujitsu.com>
Date:	Thu, 28 Apr 2011 22:50:18 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Dave Young <hidave.darkstar@...il.com>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mel Gorman <mel@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux.com>,
	Dave Chinner <david@...morbit.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [patch] vmstat: account page allocation failures

>  nopage:
> +	inc_zone_state(preferred_zone, NR_ALLOC_FAIL);
> +	/* count_zone_vm_events(PGALLOCFAIL, preferred_zone, 1 << order); */
>  	if (!(gfp_mask & __GFP_NOWARN) && printk_ratelimit()) {
>  		unsigned int filter = SHOW_MEM_FILTER_NODES;
>  
> --- linux-next.orig/mm/vmstat.c	2011-04-28 21:34:30.000000000 +0800
> +++ linux-next/mm/vmstat.c	2011-04-28 21:34:35.000000000 +0800
> @@ -879,6 +879,7 @@ static const char * const vmstat_text[] 
>  	"nr_shmem",
>  	"nr_dirtied",
>  	"nr_written",
> +	"nr_alloc_fail",

I'm using very similar patch for debugging. However, this is useless for
admins because typical linux load have plenty GFP_ATOMIC allocation failure.
So, typical user have no way that failure rate is high or not.




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