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Fri, 24 Jun 2022 12:26:11 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 197MGWOttWKZYgAAMHmgww (envelope-from ); Fri, 24 Jun 2022 12:26:11 +0000 Date: Fri, 24 Jun 2022 14:26:10 +0200 From: Michal =?iso-8859-1?Q?Koutn=FD?= To: Vasily Averin Cc: Shakeel Butt , Michal Hocko , kernel@openvz.org, Andrew Morton , LKML , Linux MM , Roman Gushchin , Vlastimil Babka , Muchun Song , Cgroups Subject: Re: [PATCH mm v5 0/9] memcg: accounting for objects allocated by mkdir, cgroup Message-ID: <20220624122610.GG16004@blackbody.suse.cz> References: <4e685057-b07d-745d-fdaa-1a6a5a681060@openvz.org> <0fe836b4-5c0f-0e32-d511-db816d359748@openvz.org> <0f8146e3-5865-b7e6-6728-5baada375cf2@openvz.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="HG+GLK89HZ1zG0kk" Content-Disposition: inline In-Reply-To: <0f8146e3-5865-b7e6-6728-5baada375cf2@openvz.org> User-Agent: Mutt/1.10.1 (2018-07-13) ARC-Seal: i=1; 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dkim=pass header.d=suse.com header.s=susede1 header.b=mrYLsPoE; spf=pass (imf13.hostedemail.com: domain of mkoutny@suse.com designates 195.135.220.29 as permitted sender) smtp.mailfrom=mkoutny@suse.com; dmarc=pass (policy=quarantine) header.from=suse.com X-Rspam-User: X-Stat-Signature: 3thxu1jh9fbwzbggpxmtd8h9dxkg7wcx X-HE-Tag: 1656073573-307665 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: --HG+GLK89HZ1zG0kk Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Fri, Jun 24, 2022 at 01:40:14PM +0300, Vasily Averin wrote: > Btw could you please explain why memory cgroups have MEM_CGROUP_ID_MAX limit > Why it is required at all and why it was set to USHRT_MAX? I believe that > in the future it may be really reachable: IIRC, one reason is 2B * nr_swap_pages of memory overhead (in swap_cgroup_swapon()) that's ~0.05% of swap space occupied additionally in RAM (fortunately swap needn't cover whole RAM). HTH, Michal --HG+GLK89HZ1zG0kk Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- iHUEARYIAB0WIQTrXXag4J0QvXXBmkMkDQmsBEOquQUCYrWtXgAKCRAkDQmsBEOq uTryAQCHh6ZZYDD+j5lciUOhDxLFMQ15T9S7Ty/OmIhNzCcXwwD/YhFGF7ylqaSv BYyT9akQtqnK5O1l1tmp4Hp0oIkmMAs= =mx99 -----END PGP SIGNATURE----- --HG+GLK89HZ1zG0kk--