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From: Kent Overstreet To: Jens Axboe Cc: Roman Gushchin , Yosry Ahmed , Michal Hocko , Mel Gorman , Peter Zijlstra , Suren Baghdasaryan , Andrew Morton , Vlastimil Babka , Johannes Weiner , dave@stgolabs.net, Matthew Wilcox , liam.howlett@oracle.com, void@manifault.com, juri.lelli@redhat.com, ldufour@linux.ibm.com, Peter Xu , David Hildenbrand , mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, changbin.du@intel.com, ytcoode@gmail.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, Steven Rostedt , bsegall@google.com, bristot@redhat.com, vschneid@redhat.com, Christoph Lameter , Pekka Enberg , Joonsoo Kim , 42.hyeyoo@gmail.com, glider@google.com, elver@google.com, dvyukov@google.com, Shakeel Butt , Muchun Song , arnd@arndb.de, jbaron@akamai.com, David Rientjes , minchan@google.com, kaleshsingh@google.com, kernel-team@android.com, Linux-MM , iommu@lists.linux.dev, kasan-dev@googlegroups.com, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org, linux-modules@vger.kernel.org, Linux Kernel Mailing List Subject: Re: [RFC PATCH 00/30] Code tagging framework and applications Message-ID: <20220902200555.h5fyamst6lyamjnw@moria.home.lan> References: <20220831190154.qdlsxfamans3ya5j@moria.home.lan> <20220901223720.e4gudprscjtwltif@moria.home.lan> <20220902001747.qqsv2lzkuycffuqe@moria.home.lan> <3a41b9fc-05f1-3f56-ecd0-70b9a2912a31@kernel.dk> <20220902194839.xqzgsoowous72jkz@moria.home.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1662149165; h=from:from: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=SemCjjx9bqrqhFAABAkUIroCfCc94PYvIF1DVQSZFl4=; b=0Iu57CtheTrckA9Hb4at7CRm3BYmmHWKHZV0GeMHtiyrw7C4wjhCnDvfl6e9ifJLPQjumx U7Z6EMtnjGhofUO1DWksgW7r+eZ598HsBK55xDG7tTjqiOiRtvZuAqp611p/9qReLo9TSh I7JVhSkEqyC4HzEKaED2yqRvg8Y06YM= ARC-Authentication-Results: i=1; imf23.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=DkqxrENv; spf=pass (imf23.hostedemail.com: domain of kent.overstreet@linux.dev designates 94.23.1.103 as permitted sender) smtp.mailfrom=kent.overstreet@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1662149165; a=rsa-sha256; cv=none; b=wwvxO8lFrMHDtYakGMCnAEUh9N6bmpQNToBUM6qWIjQHgNM8mpCiqVEC0gNj7JQf9wcOTS mpeM9zI3oBFW9VdrIMgRHzZlNKyvjRX3orCtP4uPKDEmj1Peeg4vVRjx3mQOZRISHTLNkw jTUIeRmKa6gYT3PXZDG5fsDabepVCLw= X-Stat-Signature: mc4c6yd3pyduazdffyz75t76cq6y8qsh X-Rspamd-Queue-Id: 33DCF140067 X-Rspam-User: Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=DkqxrENv; spf=pass (imf23.hostedemail.com: domain of kent.overstreet@linux.dev designates 94.23.1.103 as permitted sender) smtp.mailfrom=kent.overstreet@linux.dev; dmarc=pass (policy=none) header.from=linux.dev X-Rspamd-Server: rspam01 X-HE-Tag: 1662149165-217006 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 Fri, Sep 02, 2022 at 01:53:53PM -0600, Jens Axboe wrote: > I've complained about memcg accounting before, the slowness of it is why > io_uring works around it by caching. Anything we account we try NOT do > in the fast path because of it, the slowdown is considerable. I'm with you on that, it definitely raises an eyebrow. > You care about efficiency now? I thought that was relegated to > irrelevant 10M IOPS cases. I always did, it's just not the only thing I care about.