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From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Gautham R Shenoy <ego@linux.vnet.ibm.com>
Cc: Michal Hocko <mhocko@suse.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Mel Gorman <mgorman@suse.de>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	Andrew Morton <akpm@linux-foundation.org>,
	linuxppc-dev@lists.ozlabs.org, Christopher Lameter <cl@linux.com>,
	Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [PATCH v2 2/3] powerpc/numa: Prefer node id queried from vphn
Date: Thu, 30 Apr 2020 10:04:45 +0530
Message-ID: <20200430043445.GE19958@linux.vnet.ibm.com> (raw)
In-Reply-To: <20200429065229.GA18304@in.ibm.com>

* Gautham R Shenoy <ego@linux.vnet.ibm.com> [2020-04-29 12:22:29]:

> Hello Srikar,
> 
> 
> > +		if (nid == NUMA_NO_NODE) {
> > +			cpu = of_get_cpu_node(i, NULL);
> > +			if (cpu) {
> 
> Why are we not retaining the BUG_ON(!cpu) assert here ?
> 
> > +				nid = of_node_to_nid_single(cpu);
> > +				of_node_put(cpu);
> > +			}
> > +		}
> 
> Is it possible at this point that both vphn_get_nid(i) and
> of_node_to_nid_single(cpu) returns NUMA_NO_NODE ? If so,
> should we still call node_set_online() below ?

Yeah, I think It makes sense to retain the BUG_ON and if check.

Will incorporate both of them in the next version.

> 
> 
> >  		node_set_online(nid);
> >  	}
> > 
> > -- 
> > 2.20.1
> > 
> --
> Thanks and Regards
> gautham.

-- 
Thanks and Regards
Srikar Dronamraju

  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-28  9:38 [PATCH v2 0/3] Offline memoryless cpuless node 0 Srikar Dronamraju
2020-04-28  9:38 ` [PATCH v2 1/3] powerpc/numa: Set numa_node for all possible cpus Srikar Dronamraju
2020-04-28  9:38 ` [PATCH v2 2/3] powerpc/numa: Prefer node id queried from vphn Srikar Dronamraju
2020-04-29  6:52   ` Gautham R Shenoy
2020-04-30  4:34     ` Srikar Dronamraju [this message]
2020-04-28  9:38 ` [PATCH v2 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline Srikar Dronamraju
2020-04-28 23:59   ` Andrew Morton
2020-04-29  1:41     ` Srikar Dronamraju
2020-04-29 12:22       ` Michal Hocko
2020-04-30  7:18         ` Srikar Dronamraju
2020-05-04  9:37           ` Michal Hocko
2020-05-08 13:03             ` Srikar Dronamraju
2020-05-08 13:39               ` David Hildenbrand
2020-05-08 13:42                 ` David Hildenbrand
2020-05-11 17:47                   ` Srikar Dronamraju
2020-05-12  7:49                     ` David Hildenbrand
2020-05-12 10:42                       ` Srikar Dronamraju

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