linux-kernel - Re: [PATCH 10/17] netvm: Allow skb allocation to use PFMEMALLOC reserves

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Message-ID: <20120511150747.GU11435@suse.de>
Date:	Fri, 11 May 2012 16:07:47 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	David Miller <davem@...emloft.net>, akpm@...ux-foundation.org,
	linux-mm@...ck.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, neilb@...e.de, michaelc@...wisc.edu,
	emunson@...bm.net
Subject: Re: [PATCH 10/17] netvm: Allow skb allocation to use PFMEMALLOC
 reserves

On Fri, May 11, 2012 at 04:42:30PM +0200, Peter Zijlstra wrote:
> On Fri, 2012-05-11 at 15:32 +0100, Mel Gorman wrote:
> > > > +extern atomic_t memalloc_socks;
> > > > +static inline int sk_memalloc_socks(void)
> > > > +{
> > > > +   return atomic_read(&memalloc_socks);
> > > > +}
> > > 
> > > Please change this to be a static branch.
> > > 
> > 
> > Will do. I renamed memalloc_socks to sk_memalloc_socks, made it a int as
> > atomics are unnecessary and I check it directly in a branch instead of a
> > static inline. It should be relatively easy for the branch predictor. 
> 
> David means you to use include/linux/jump_label.h.
> 

Ah, that makes a whole lot more sense. Thanks for the clarification.

-- 
Mel Gorman
SUSE Labs
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