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Fri, 9 Aug 2024 14:10:14 -0700 (PDT) Date: Fri, 9 Aug 2024 14:10:14 -0700 (PDT) From: "Christoph Lameter (Ampere)" To: Shuah Khan cc: Dev Jain , akpm@linux-foundation.org, shuah@kernel.org, david@redhat.com, willy@infradead.org, ryan.roberts@arm.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, vbabka@suse.cz, mhocko@suse.com, apopple@nvidia.com, osalvador@suse.de, baolin.wang@linux.alibaba.com, dave.hansen@linux.intel.com, will@kernel.org, baohua@kernel.org, ioworker0@gmail.com, gshan@redhat.com, mark.rutland@arm.com, kirill.shutemov@linux.intel.com, hughd@google.com, aneesh.kumar@kernel.org, yang@os.amperecomputing.com, peterx@redhat.com, broonie@kernel.org, mgorman@techsingularity.net, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH 2/2] selftests/mm: Do not fail test for a single migration failure In-Reply-To: Message-ID: References: <20240809103129.365029-1-dev.jain@arm.com> <20240809103129.365029-3-dev.jain@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed X-Rspamd-Queue-Id: 7F41618000E X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: bwshz4xz6re8q574nx5ppwybzwgs18gw X-HE-Tag: 1723239225-631617 X-HE-Meta: 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 UWzWDNJw vdDrD5/qEsdkP5T4nT8xDAZNSlA1NSi/pej2FUhgoXUQ2o2jGrVENS4/Hc5/CSdx7Yo7po9Sa7QzAfmeurmdfXPcJSwGhr8S1/ptZisQbUpWX8ORQGS+PVyvC7y6N+vUv6EjBSBFjXoR9+UNx7vkrV22zm2LJh4udzq+VluwFajNQlhX5nqnFlguWNvH+y7XGVO1WXR6A6t20i/E= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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.