From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 750D4ECAAD3 for ; Wed, 31 Aug 2022 08:43:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230070AbiHaInP (ORCPT ); Wed, 31 Aug 2022 04:43:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55304 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231578AbiHaImv (ORCPT ); Wed, 31 Aug 2022 04:42:51 -0400 Received: from out0.migadu.com (out0.migadu.com [94.23.1.103]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CCA9FC228D; Wed, 31 Aug 2022 01:42:40 -0700 (PDT) Date: Wed, 31 Aug 2022 04:42:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1661935359; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=mmxSzJIEbF0byhuM+VO8IRNgyEUbvUgCaJEiam4Pxpk=; b=n/WRdO6wsbcgzM9IZmiTOpoQilc55+w4Qjuqwl1Dpnv4eEgQ85RLBu7SGRYgk8JFEOmxmG 9NkKta+Gf2utqPzv5rM3bIlfQN3qtDLursIA2MwCGrMNSc7KVtiJCfMkW0/8k5e3nZiAGS tjj529y20oHTMERlcuL/JelsPUM2hZU= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. 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 Precedence: bulk List-ID: X-Mailing-List: linux-bcache@vger.kernel.org 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?