linux-kernel - Re: [PATCH] drivers, vmw_balloon.c: Determine page allocation flag can

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Message-ID: <alpine.DEB.2.00.1110171231030.12560@chino.kir.corp.google.com>
Date:	Mon, 17 Oct 2011 12:31:45 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Rakib Mullick <rakib.mullick@...il.com>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Torokhov <dtor@...are.com>
Subject: Re: [PATCH] drivers, vmw_balloon.c: Determine page allocation flag
 can_sleep outside loop.

On Tue, 18 Oct 2011, Rakib Mullick wrote:

> diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
> index 053d36c..6983d80 100644
> --- a/drivers/misc/vmw_balloon.c
> +++ b/drivers/misc/vmw_balloon.c
> @@ -412,6 +412,7 @@ static int vmballoon_reserve_page(struct vmballoon *b, bool can_sleep)
>  	gfp_t flags;
>  	unsigned int hv_status;
>  	bool locked = false;
> +	flags = can_sleep ? VMW_PAGE_ALLOC_CANSLEEP : VMW_PAGE_ALLOC_NOSLEEP;
>  
>  	do {
>  		if (!can_sleep)

Should be folded in with the declaration of gfp_t flags.

Would you also like to add a might_sleep_if(can_sleep) here?

> @@ -419,7 +420,6 @@ static int vmballoon_reserve_page(struct vmballoon *b, bool can_sleep)
>  		else
>  			STATS_INC(b->stats.sleep_alloc);
>  
> -		flags = can_sleep ? VMW_PAGE_ALLOC_CANSLEEP : VMW_PAGE_ALLOC_NOSLEEP;
>  		page = alloc_page(flags);
>  		if (!page) {
>  			if (!can_sleep)
--
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