linux-kernel - Re: [PATCH] mm: rename and document alloc_pages_exact

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Message-ID: <alpine.DEB.2.10.1507231322510.31024@chino.kir.corp.google.com>
Date:	Thu, 23 Jul 2015 13:27:15 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <cl@...ux.com>
cc:	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ia64@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	cbe-oss-dev@...ts.ozlabs.org, kvm@...r.kernel.org,
	Mel Gorman <mgorman@...e.de>, Greg Thelen <gthelen@...gle.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Arnd Bergmann <arnd@...db.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Cliff Whickman <cpw@....com>,
	Robin Holt <robinmholt@...il.com>
Subject: Re: [PATCH] mm: rename and document alloc_pages_exact_node

On Thu, 23 Jul 2015, Christoph Lameter wrote:

> > The only possible downside would be existing users of
> > alloc_pages_node() that are calling it with an offline node.  Since it's a
> > VM_BUG_ON() that would catch that, I think it should be changed to a
> > VM_WARN_ON() and eventually fixed up because it's nonsensical.
> > VM_BUG_ON() here should be avoided.
> 
> The offline node thing could be addresses by using numa_mem_id()?
> 

I was concerned about any callers that were passing an offline node, not 
NUMA_NO_NODE, today.  One of the alloc-node functions has a VM_BUG_ON() 
for it, the other silently calls node_zonelist() on it.

I suppose the final alloc_pages_node() implementation could be

        if (nid == NUMA_NO_NODE || VM_WARN_ON(!node_online(nid)))
                nid = numa_mem_id();

        VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
        return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));

though.
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