linux-ext4 - Re: [patch 4/6] jbd: remove dependency on __GFP

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Message-ID: <alpine.DEB.2.00.1008231520170.19203@chino.kir.corp.google.com>
Date:	Mon, 23 Aug 2010 15:22:26 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 4/6] jbd: remove dependency on __GFP_NOFAIL

On Mon, 23 Aug 2010, Andrew Morton wrote:

> > So do
> > you think that we should keep __GFP_NOFAIL as long as all callers are not
> > able to handle allocation failures in more reasonable way?
> 
> The concept should be encapsulated in _some_ centralised fashion.
> 
> Helper functions would work as well as __GFP_NOFAIL, and will move any
> runtime cost away from the good code and push it onto the bad code.
> 

There's no runtime cost on the bad code, the calls never loop since the 
page allocator already loops itself.  Regardless, I'll add a helper 
function to include/linux/gfp.h to do this with a WARN_ON_ONCE() inside 
the loop in case any order > PAGE_ALLOC_COSTLY_ORDER callers are ever 
added (and I really hope nobody merges those).
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