linux-kernel - Re: [RFC] mm/migrate: Add new migration reason MR

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Message-Id: <b4bd6cda-a3b7-96dd-b634-d9b3670c1ecf@linux.vnet.ibm.com>
Date:   Wed, 31 Jan 2018 07:55:05 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     Michal Hocko <mhocko@...nel.org>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org
Subject: Re: [RFC] mm/migrate: Add new migration reason MR_HUGETLB

On 01/30/2018 01:29 PM, Michal Hocko wrote:
> On Tue 30-01-18 08:37:14, Anshuman Khandual wrote:
>> alloc_contig_range() initiates compaction and eventual migration for
>> the purpose of either CMA or HugeTLB allocation. At present, reason
>> code remains the same MR_CMA for either of those cases. Lets add a
>> new reason code which will differentiate the purpose of migration
>> as HugeTLB allocation instead.
> Why do we need it?

The same reason why we have MR_CMA (maybe some other ones as well) at
present, for reporting purpose through traces at the least. It just
seemed like same reason code is being used for two different purpose
of migration.