From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [RFC][PATCH 3/4] deadlock prevention core From: Peter Zijlstra In-Reply-To: <44640.81.207.0.53.1155403862.squirrel@81.207.0.53> References: <20060812141415.30842.78695.sendpatchset@lappy> <20060812141445.30842.47336.sendpatchset@lappy> <44640.81.207.0.53.1155403862.squirrel@81.207.0.53> Content-Type: text/plain Date: Sat, 12 Aug 2006 19:44:56 +0200 Message-Id: <1155404697.13508.81.camel@lappy> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Indan Zupancic Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Evgeniy Polyakov , Daniel Phillips , Rik van Riel , David Miller List-ID: On Sat, 2006-08-12 at 19:31 +0200, Indan Zupancic wrote: > On Sat, August 12, 2006 16:14, Peter Zijlstra said: > > +struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask, int fclone) > > +{ > > + struct sk_buff *skb; > > + > > + skb = ___alloc_skb(size, gfp_mask & ~__GFP_MEMALLOC, fclone); > > + > > + if (!skb && (gfp_mask & __GFP_MEMALLOC) && memalloc_skbs_available()) > > + skb = ___alloc_skb(size, gfp_mask, fclone); > > + > > + return skb; > > +} > > + > > I'd drop the memalloc_skbs_available() check, as that's already done by > ___alloc_skb. Right, thanks. Hmm, its the last occurence of that function, even better. > > +static DEFINE_SPINLOCK(memalloc_lock); > > +static int memalloc_socks; > > +static unsigned long memalloc_reserve; > > Why is this a long? adjust_memalloc_reserve() takes an int. Euhm, right :-) long comes naturaly when I think about quantities op pages. The adjust_memalloc_reserve() argument is an increment, a delta; perhaps I should change that to long. > Is it needed at all, considering var_free_kbytes already exists? Having them separate would allow ajust_memalloc_reserve() to be used by other callers too (would need some extra locking). -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org