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Wed, 31 Aug 2022 07:38:32 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 8A485300413; Wed, 31 Aug 2022 09:38:27 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 66CD32B843CC0; Wed, 31 Aug 2022 09:38:27 +0200 (CEST) Date: Wed, 31 Aug 2022 09:38:27 +0200 From: Peter Zijlstra To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, kent.overstreet@linux.dev, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, roman.gushchin@linux.dev, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, void@manifault.com, juri.lelli@redhat.com, ldufour@linux.ibm.com, peterx@redhat.com, david@redhat.com, axboe@kernel.dk, mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, changbin.du@intel.com, ytcoode@gmail.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com, vschneid@redhat.com, cl@linux.com, penberg@kernel.org, iamjoonsoo.kim@lge.com, 42.hyeyoo@gmail.com, glider@google.com, elver@google.com, dvyukov@google.com, shakeelb@google.com, songmuchun@bytedance.com, arnd@arndb.de, jbaron@akamai.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, kernel-team@android.com, linux-mm@kvack.org, 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@vger.kernel.org Subject: Re: [RFC PATCH 00/30] Code tagging framework and applications Message-ID: References: <20220830214919.53220-1-surenb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220830214919.53220-1-surenb@google.com> ARC-Authentication-Results: i=1; imf13.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=OachOLS7; spf=none (imf13.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=peterz@infradead.org; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1661931540; a=rsa-sha256; cv=none; b=ke7AMcKvVP9O1QVK48COI0Vx5kOlzc/bfkmYHl7WWEWbNHXZoxUjiEuT+/z3KnpJSala3K ehJfIB400BwOEtQ5LYPlbF7xpG0YqAaf+X6CyOg6JhZFeFyc1nn/TVJGKh2S3+aKVhzVW3 3QIJ4BP6DMM76ToaNoc1TF/74rNL7yM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1661931540; 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=gDCNZ3f2D6OuuyZZIQqudj53nBzwis7zfrQMn3P2Fjk=; b=YLxb2oIT1w0Xefp0XwmxTAFkrsfvOWBOybFEib1/TuO+eUGbtBMEqEm9IP6I0I7hRZ8UwX A6TxmPiIGsHBcBP8pacRD/DLu2U0SSeyKp9yU3ZdlSs7q7WRMFAowhO/CZwOqjTotZZFQE 4l+b7uFP+hKurFdNGWfYRdFgV2YOacc= X-Rspam-User: X-Rspamd-Queue-Id: DE19320026 Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=OachOLS7; spf=none (imf13.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=peterz@infradead.org; dmarc=none X-Stat-Signature: cw7x8qpqzeeo9yzm5pfc66t3hy7ry8mi X-Rspamd-Server: rspam08 X-HE-Tag: 1661931539-372258 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 Tue, Aug 30, 2022 at 02:48:49PM -0700, Suren Baghdasaryan wrote: > =========================== > Code tagging framework > =========================== > Code tag is a structure identifying a specific location in the source code > which is generated at compile time and can be embedded in an application- > specific structure. Several applications of code tagging are included in > this RFC, such as memory allocation tracking, dynamic fault injection, > latency tracking and improved error code reporting. > Basically, it takes the old trick of "define a special elf section for > objects of a given type so that we can iterate over them at runtime" and > creates a proper library for it. I might be super dense this morning, but what!? I've skimmed through the set and I don't think I get it. What does this provide that ftrace/kprobes don't already allow?