linux-kernel - Re: [PATCH 03/31] mm: expose gfp_to_alloc

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Message-ID: <4AC5B59E.3050608@suse.de>
Date:	Fri, 02 Oct 2009 13:41:10 +0530
From:	Suresh Jayaraman <sjayaraman@...e.de>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	netdev@...r.kernel.org, Neil Brown <neilb@...e.de>,
	Miklos Szeredi <mszeredi@...e.cz>, Wouter Verhelst <w@...r.be>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	trond.myklebust@....uio.no
Subject: Re: [PATCH 03/31] mm: expose gfp_to_alloc_flags()

David Rientjes wrote:
> On Thu, 1 Oct 2009, Suresh Jayaraman wrote:
> 
>> From: Peter Zijlstra <a.p.zijlstra@...llo.nl> 
>>
>> Expose the gfp to alloc_flags mapping, so we can use it in other parts
>> of the vm.
>>
>> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
>> Signed-off-by: Suresh Jayaraman <sjayaraman@...e.de>
> 
> Nack, these flags are internal to the page allocator and exporting them to 
> generic VM code is unnecessary.

Yes, you're right.

> The only bit you actually use in your patchset is ALLOC_NO_WATERMARKS to 
> determine whether a particular allocation can use memory reserves.  I'd 
> suggest adding a bool function that returns whether the current context is 
> given access to reserves including your new __GFP_MEMALLOC flag and 
> exporting that instead.

Makes sense and Neil already posted a patch citing the suggested
changes, will incorporate the change.

Thanks,

-- 
Suresh Jayaraman
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