linux-kernel - Re: [PATCH 2/2] selftests/mm: Do not fail test for a single migration failure

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Message-ID: <aead8fc9-c60a-9ac6-280e-b2b9de85727c@gentwo.org>
Date: Fri, 9 Aug 2024 14:10:14 -0700 (PDT)
From: "Christoph Lameter (Ampere)" <cl@...two.org>
To: Shuah Khan <skhan@...uxfoundation.org>
cc: Dev Jain <dev.jain@....com>, akpm@...ux-foundation.org, shuah@...nel.org, 
    david@...hat.com, willy@...radead.org, ryan.roberts@....com, 
    anshuman.khandual@....com, catalin.marinas@....com, vbabka@...e.cz, 
    mhocko@...e.com, apopple@...dia.com, osalvador@...e.de, 
    baolin.wang@...ux.alibaba.com, dave.hansen@...ux.intel.com, 
    will@...nel.org, baohua@...nel.org, ioworker0@...il.com, gshan@...hat.com, 
    mark.rutland@....com, kirill.shutemov@...ux.intel.com, hughd@...gle.com, 
    aneesh.kumar@...nel.org, yang@...amperecomputing.com, peterx@...hat.com, 
    broonie@...nel.org, mgorman@...hsingularity.net, 
    linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
    linux-mm@...ck.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 2/2] selftests/mm: Do not fail test for a single migration
 failure

On Fri, 9 Aug 2024, Shuah Khan wrote:

> "Given that migration is a best-effort service, it is wrong to fail the
> test for just a single failure; hence, fail the test after 100 consecutive
> failures (where 100 is still a subjective choice)."
>
> You do want to mention the above here.
>
> The reason being, I would like to know what this does to the run-time of
> this test if migration fails and retried 100 times.

If we backoff earlier without engaging too much with the page then we can 
in turn affort to retry more times.