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From: Kent Overstreet To: Peter Zijlstra Cc: Suren Baghdasaryan , akpm@linux-foundation.org, 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: <20220831084230.3ti3vitrzhzsu3fs@moria.home.lan> References: <20220830214919.53220-1-surenb@google.com> 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-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b="n/WRdO6w"; spf=pass (imf01.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=1661935361; a=rsa-sha256; cv=none; b=gzQ5nKtmXUHU0S5RnHXeC9mYre9Brctl6F7En3LWS+rVgbWdmm37Gp2v3HqAMgsnL1J8OI OswfAOUDKh58uGdpctWzA9lMiDZOexGykhodqFgyjaJXA1VYLSen9VK1UVNnanlsEqMeSa Knm45QnKAojpcAtJIG9w7UkBVWNYcec= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1661935361; 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=mmxSzJIEbF0byhuM+VO8IRNgyEUbvUgCaJEiam4Pxpk=; b=yaxfqnz8qHWz3NlFX3I1qtKb01hTpt4CKCDGWxFx8x6OXVoQ1U0WOwTXl6dC/3orzB5ioi MnTkprGIXotn8p7bb3ruq4enMCK4W0eVVIef5dxf12kq2Cpw1apJn6Owns3O069AMo5pBJ BiEqDk9UBktja0nw85iFs0kzmtax6cM= X-Rspam-User: X-Rspamd-Queue-Id: 2D80B40037 Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b="n/WRdO6w"; spf=pass (imf01.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-Stat-Signature: whmf3x3j1ijexd78w8qg6uyph6b43jto X-Rspamd-Server: rspam08 X-HE-Tag: 1661935361-888836 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 Wed, Aug 31, 2022 at 09:38:27AM +0200, Peter Zijlstra wrote: > 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? You're kidding, right?