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[2603:800c:1a02:1bae:a7fa:157f:969a:4cde]) by smtp.gmail.com with ESMTPSA id n30-20020a17090a5aa100b0020a11217682sm3413822pji.27.2022.10.10.17.19.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Oct 2022 17:19:58 -0700 (PDT) Date: Mon, 10 Oct 2022 14:19:56 -1000 From: Tejun Heo To: Yosry Ahmed Cc: Zefan Li , Johannes Weiner , Michal Hocko , Shakeel Butt , Roman Gushchin , Michal =?iso-8859-1?Q?Koutn=FD?= , Andrew Morton , Linux-MM , Cgroups , Greg Thelen Subject: Re: [RFC] memcg rstat flushing optimization Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ARC-Authentication-Results: i=1; imf15.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=QPrMaTYM; spf=pass (imf15.hostedemail.com: domain of htejun@gmail.com designates 209.85.210.176 as permitted sender) smtp.mailfrom=htejun@gmail.com; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=kernel.org (policy=none) ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1665447599; a=rsa-sha256; cv=none; b=jwArBw9HxaSlg76VCBdM4cD7mJXSpW6W9xP7ztpLKTAjoqxiRRZD5lKsoIOW0qj6ieSNCT HMKDOU7WArUQRJjvxB62181/Gpvd7yM30hBk8epLkcroOvl/2cvcaJIolFpwYPkDXKlSzf JtOGnMqCnl5i4wWiPVArfv+e6h4e9EE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1665447599; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=nGoDydYwFqmdmKnzszjtdksfmEzjuo68M+fcbC8JTZY=; b=ol9KYEiD0fuzZLtYG0w1oiKuDQKBONMlfkH4LdZvSdo7qjmO7uXMPVjQrP4rJcyo6MFl5F eXDjx7V0cG75BYm58lSiaqQ1Ei7aEeqLIjlLW4Iy1SD6HU+isqyxFz67pb7bpimU0Z7DM6 u7S9RMzDUbTeSaDa4ztUJUvgYyFIjJM= X-Rspamd-Queue-Id: 9AF24A0022 X-Rspam-User: Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=QPrMaTYM; spf=pass (imf15.hostedemail.com: domain of htejun@gmail.com designates 209.85.210.176 as permitted sender) smtp.mailfrom=htejun@gmail.com; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=kernel.org (policy=none) X-Rspamd-Server: rspam10 X-Stat-Signature: eq4cfkhwqpjp8wjqm4j8d6qyta8t5ph1 X-HE-Tag: 1665447599-981581 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: Hello, On Mon, Oct 10, 2022 at 05:15:33PM -0700, Yosry Ahmed wrote: > Any thoughts here, Tejun or anyone? I'm having a bit of hard time imagining how things would look like without code and I think we'd need inputs from mm folks re. the tradeoff between information timeliness and overhead. Thanks. -- tejun