linux-kernel - Re: [PATCH v2 2/3] powerpc/numa: Prefer node id queried from vphn

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Date:   Thu, 30 Apr 2020 10:04:45 +0530
From:   Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:     Gautham R Shenoy <ego@...ux.vnet.ibm.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.com>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Christopher Lameter <cl@...ux.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2 2/3] powerpc/numa: Prefer node id queried from vphn

* Gautham R Shenoy <ego@...ux.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