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[71.184.117.43]) by smtp.gmail.com with ESMTPSA id l6sm5718357qkf.83.2019.06.16.18.41.10 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 16 Jun 2019 18:41:10 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Subject: Re: LTP hugemmap05 test case failure on arm64 with linux-next (next-20190613) From: Qian Cai In-Reply-To: <054b6532-a867-ec7c-0a72-6a58d4b2723e@arm.com> Date: Sun, 16 Jun 2019 21:41:09 -0400 Cc: Will Deacon , Catalin Marinas , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <1560461641.5154.19.camel@lca.pw> <20190614102017.GC10659@fuggles.cambridge.arm.com> <1560514539.5154.20.camel@lca.pw> <054b6532-a867-ec7c-0a72-6a58d4b2723e@arm.com> To: Anshuman Khandual X-Mailer: Apple Mail (2.3445.104.11) 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: > On Jun 16, 2019, at 9:32 PM, Anshuman Khandual = wrote: >=20 > Hello Qian, >=20 > On 06/14/2019 05:45 PM, Qian Cai wrote: >> On Fri, 2019-06-14 at 11:20 +0100, Will Deacon wrote: >>> Hi Qian, >>>=20 >>> On Thu, Jun 13, 2019 at 05:34:01PM -0400, Qian Cai wrote: >>>> LTP hugemmap05 test case [1] could not exit itself properly and = then degrade >>>> the >>>> system performance on arm64 with linux-next (next-20190613). The = bisection >>>> so >>>> far indicates, >>>>=20 >>>> BAD: 30bafbc357f1 Merge remote-tracking branch = 'arm64/for-next/core' >>>> GOOD: 0c3d124a3043 Merge remote-tracking branch = 'arm64-fixes/for-next/fixes' >>>=20 >>> Did you finish the bisection in the end? Also, what config are you = using >>> (you usually have something fairly esoteric ;)? >>=20 >> No, it is still running. >>=20 >> https://raw.githubusercontent.com/cailca/linux-mm/master/arm64.config >>=20 >=20 > Were you able to bisect the problem till a particular commit ? Not yet, it turned out the test case needs to run a few times (usually = within 5) to reproduce, so the previous bisection was totally wrong = where it assume the bad commit will fail every time. Once reproduced, = the test case becomes unkillable stuck in the D state. I am still in the middle of running a new round of bisection. The = current progress is, 35c99ffa20ed GOOD (survived 20 times) def0fdae813d BAD=