linux-kernel - Re: [PATCH] mm/alloc: fallback to first node if the wanted node offline

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Message-ID: <alpine.DEB.2.21.1812051058440.240991@chino.kir.corp.google.com>
Date:   Wed, 5 Dec 2018 11:00:19 -0800 (PST)
From:   David Rientjes <rientjes@...gle.com>
To:     Pingfan Liu <kernelfans@...il.com>
cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH] mm/alloc: fallback to first node if the wanted node
 offline

On Wed, 5 Dec 2018, Pingfan Liu wrote:

> > > And rather than using first_online_node, would next_online_node() work?
> > >
> > What is the gain? Is it for memory pressure on node0?
> >
> Maybe I got your point now.  Do you try to give a cheap assumption on
> nearest neigh of this node?
> 

It's likely better than first_online_node, but probably going to be the 
same based on the node ids that you have reported since the nodemask will 
simply wrap around back to the first node.