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[71.184.117.43]) by smtp.gmail.com with ESMTPSA id t4sm879950qtq.49.2019.10.24.07.56.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 24 Oct 2019 07:56:00 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: Qian Cai Mime-Version: 1.0 (1.0) Subject: Re: [PATCH] mm/vmstat: Reduce zone lock hold time when reading /proc/pagetypeinfo Date: Thu, 24 Oct 2019 10:55:59 -0400 Message-Id: <884AF12F-2CC5-4DCE-9F94-BEADECA98888@lca.pw> References: <20191024133859.GX17610@dhcp22.suse.cz> Cc: Andrew Morton , Waiman Long , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Johannes Weiner , Roman Gushchin , Vlastimil Babka , Konstantin Khlebnikov , Jann Horn , Song Liu , Greg Kroah-Hartman , Rafael Aquini In-Reply-To: <20191024133859.GX17610@dhcp22.suse.cz> To: Michal Hocko X-Mailer: iPhone Mail (17A878) 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 Oct 24, 2019, at 9:39 AM, Michal Hocko wrote: >=20 > Because the migrate type is the information that helps to understand > fragmentation related issues. I am pretty sure Vlastimil would tell you > much more. Then, I don=E2=80=99t see any point of having two files (pagetypeinfo and bu= ddyinfo) exporting the similar type of information which is probably more im= portant to figure out than fixing the 10-year old DoS.=