linux-kernel - Re: [patch 1/2] mm: remove GFP

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Message-ID: <alpine.DEB.2.10.1502271428320.7225@chino.kir.corp.google.com>
Date:	Fri, 27 Feb 2015 14:31:45 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Vlastimil Babka <vbabka@...e.cz>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Pravin Shelar <pshelar@...ira.com>,
	Jarno Rajahalme <jrajahalme@...ira.com>,
	Greg Thelen <gthelen@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, netdev@...r.kernel.org, dev@...nvswitch.org
Subject: Re: [patch 1/2] mm: remove GFP_THISNODE

On Fri, 27 Feb 2015, Vlastimil Babka wrote:

> > Do you see any issues with either patch 1/2 or patch 2/2 besides the 
> > s/GFP_TRANSHUGE/GFP_THISNODE/ that is necessary on the changelog?
> 
> Well, my point is, what if the node we are explicitly trying to allocate
> hugepage on, is in fact not allowed by our cpuset? This could happen in the page
> fault case, no? Although in a weird configuration when process can (and really
> gets scheduled to run) on a node where it is not allowed to allocate from...
> 

If the process is running a node that is not allowed by the cpuset, then 
alloc_hugepage_vma() now fails with VM_FAULT_FALLBACK.  That was the 
intended policy change of commit 077fcf116c8c ("mm/thp: allocate 
transparent hugepages on local node").

 [ alloc_hugepage_vma() should probably be using numa_mem_id() instead for 
   memoryless node platforms. ]
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