linux-kernel - Re: [PATCH 2/2] print vmalloc() state after allocation failures

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Date:	Fri, 15 Apr 2011 19:20:28 +0200
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	linux-mm@...ck.org, "Dave Hansen" <dave@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	"Johannes Weiner" <hannes@...xchg.org>,
	"David Rientjes" <rientjes@...gle.com>, akpm@...l.org
Subject: Re: [PATCH 2/2] print vmalloc() state after allocation failures

On Fri, 15 Apr 2011 19:04:38 +0200, Dave Hansen wrote:
> diff -puN mm/vmalloc.c~vmalloc-warn mm/vmalloc.c
> --- linux-2.6.git/mm/vmalloc.c~vmalloc-warn	2011-04-15  
> 08:49:06.823306620 -0700
> +++ linux-2.6.git-dave/mm/vmalloc.c	2011-04-15 09:20:17.926460283 -0700
> @@ -1534,6 +1534,7 @@ static void *__vmalloc_node(unsigned lon
>  static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
>  				 pgprot_t prot, int node, void *caller)
>  {
> +	int order = 0;

Could we make that const?

>  	struct page **pages;
>  	unsigned int nr_pages, array_size, i;
>  	gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
> @@ -1560,11 +1561,12 @@ static void *__vmalloc_area_node(struct
> 	for (i = 0; i < area->nr_pages; i++) {
>  		struct page *page;
> +		gfp_t tmp_mask = gfp_mask | __GFP_NOWARN;
> 		if (node < 0)
> -			page = alloc_page(gfp_mask);
> +			page = alloc_page(tmp_mask);
>  		else
> -			page = alloc_pages_node(node, gfp_mask, 0);
> +			page = alloc_pages_node(node, tmp_mask, order);

so it'll be more visible that we are passing 0 here.

> 		if (unlikely(!page)) {
>  			/* Successfully allocated i pages, free them in __vunmap() */
> @@ -1579,6 +1581,9 @@ static void *__vmalloc_area_node(struct
>  	return area->addr;
> fail:
> +	warn_alloc_failed(gfp_mask, order, "vmalloc: allocation failure, "
> +			  "allocated %ld of %ld bytes\n",
> +			  (area->nr_pages*PAGE_SIZE), area->size);
>  	vfree(area->addr);
>  	return NULL;
>  }
> _
>
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-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michal "mina86" Nazarewicz    (o o)
ooo +-----<email/xmpp: mnazarewicz@...gle.com>-----ooO--(_)--Ooo--
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