linux-kernel - Re: [FIX PATCH 1/2] mm/page_alloc: Print node fallback order

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Message-ID: <e37f46f6-3d24-03d2-51c6-28967bef0784@amd.com>
Date:   Fri, 3 Sep 2021 09:47:35 +0530
From:   Bharata B Rao <bharata@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     akpm@...ux-foundation.org, kamezawa.hiroyu@...fujitsu.com,
        lee.schermerhorn@...com, mgorman@...e.de,
        Krupa.Ramakrishnan@....com, Sadagopan.Srinivasan@....com
Subject: Re: [FIX PATCH 1/2] mm/page_alloc: Print node fallback order


On 9/3/2021 9:45 AM, Anshuman Khandual wrote:
> 
> 
> On 8/30/21 5:46 PM, Bharata B Rao wrote:
>> Print information message about the allocation fallback order
>> for each NUMA node during boot.
>>
>> No functional changes here. This makes it easier to illustrate
>> the problem in the node fallback list generation, which the
>> next patch fixes.
>>
>> Signed-off-by: Bharata B Rao <bharata@....com>
>> ---
>>  mm/page_alloc.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>> index eeb3a9cb36bb..22f7ad6ec11c 100644
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@ -6277,6 +6277,10 @@ static void build_zonelists(pg_data_t *pgdat)
>>  
>>  	build_zonelists_in_node_order(pgdat, node_order, nr_nodes);
>>  	build_thisnode_zonelists(pgdat);
>> +	pr_info("Fallback order for Node %d: ", local_node);
>> +	for (node = 0; node < nr_nodes; node++)
>> +		pr_cont("%d ", node_order[node]);
>> +	pr_cont("\n");
>>  }
>>  
>>  #ifdef CONFIG_HAVE_MEMORYLESS_NODES
>>
> 
> A small nit, checkpatch.pl throws up an warning. Should this use
> pr_info() instead ?
> 
> WARNING: Avoid logging continuation uses where feasible
> #29: FILE: mm/page_alloc.c:6282:
> +               pr_cont("%d ", node_order[node]);
> 
> WARNING: Avoid logging continuation uses where feasible
> #30: FILE: mm/page_alloc.c:6283:
> +       pr_cont("\n");
> 
> total: 0 errors, 2 warnings, 10 lines checked

Yes, I am aware of this, but then it made sense for the fallback list
to be printed in one line continuously. Hence used pr_cont().

Regards,
Bharata.
>