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[96.67.55.147]) by mx.google.com with ESMTPS id a19si1077037qkg.239.2019.04.23.09.08.44 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 23 Apr 2019 09:08:44 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of riel@shelob.surriel.com designates 96.67.55.147 as permitted sender) client-ip=96.67.55.147; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of riel@shelob.surriel.com designates 96.67.55.147 as permitted sender) smtp.mailfrom=riel@shelob.surriel.com Received: from imladris.surriel.com ([96.67.55.152]) by shelob.surriel.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91) (envelope-from ) id 1hIxyL-0007iT-M3; Tue, 23 Apr 2019 12:08:41 -0400 Message-ID: <8588314f167c9525e134ade91afdbebcd9e62eb1.camel@surriel.com> Subject: Re: [LSF/MM TOPIC] Proactive Memory Reclaim From: Rik van Riel To: Shakeel Butt , lsf-pc@lists.linux-foundation.org Cc: Linux MM , Michal Hocko , Johannes Weiner , Roman Gushchin Date: Tue, 23 Apr 2019 12:08:41 -0400 In-Reply-To: References: Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-6RxJqoLWRhnKRlHnRpNy" User-Agent: Evolution 3.30.5 (3.30.5-1.fc29) MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: --=-6RxJqoLWRhnKRlHnRpNy Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2019-04-23 at 08:30 -0700, Shakeel Butt wrote: > Topic: Proactive Memory Reclaim >=20 > Motivation/Problem: Memory overcommit is most commonly used technique > to reduce the cost of memory by large infrastructure owners. However > memory overcommit can adversely impact the performance of latency > sensitive applications by triggering direct memory reclaim. Direct > reclaim is unpredictable and disastrous for latency sensitive > applications. This sounds similar to a project Johannes has been working on, except he is not tracking which memory is idle at all, but only the pressure on each cgroup, through the PSI interface: https://facebookmicrosites.github.io/psi/docs/overview Discussing the pros and cons, and experiences with both approaches seems like a useful topic. I'll add it to the agenda. --=20 All Rights Reversed. --=-6RxJqoLWRhnKRlHnRpNy Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEKR73pCCtJ5Xj3yADznnekoTE3oMFAly/OIkACgkQznnekoTE 3oO6ggf/U2X7Nq219+xAJ96NX5fbZ0bHXaksyWxg3nAth8ai5BKGJQLBog7GGnVd g/+B/PaIkhx5l3qijzxwNJ/aTDuoKp+C0yAd5+5W6ecL4PX0z/7V2KjYCPVWehql PYNelh2MC0+MaFuLHOQ+43ITlBQbiNJTWEGpgDfwsQcnTYM2gZL3wmLNwMvP6ugW GaqqqtpzmJ7zZcokB8I+95pelQA2I6GpKtMPMOPJo/kLslvUtwaT0B3GE+Z9RF/G aXIjNRzy3QQ67bmcrfNUx7qDzZHSuRo2+Nk3bmWWO+HjJRtr4ERGdIIBqZNESbUF at1+YjW+BipD3Kt+ATsSi3xHIR6GzA== =8Rxw -----END PGP SIGNATURE----- --=-6RxJqoLWRhnKRlHnRpNy--