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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC1A9C77B78 for ; Wed, 3 May 2023 18:57:00 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5D2B36B0078; Wed, 3 May 2023 14:57:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 582556B007B; Wed, 3 May 2023 14:57:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 471856B007D; Wed, 3 May 2023 14:57:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from out-11.mta0.migadu.com (out-11.mta0.migadu.com [91.218.175.11]) by kanga.kvack.org (Postfix) with ESMTP id 2900C6B0078 for ; Wed, 3 May 2023 14:57:00 -0400 (EDT) Date: Wed, 3 May 2023 14:56:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1683140217; 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=kvDb7bxJfzE9KfjpQKTTQijQZOsAXNXH2iadfpJ44Yc=; b=h1g4T3QhYib2nBdpUAXTn+2qQD9ejDw6IFQM/FKbwPTcpONEOGJug9IN/JkcPzWXJb7WMP 26usKy4n6B80sjCITIgILHgS1JbDUF0CHEgjPjZCLkcCdcNgTyG39f1X0AAT4O4tYbSzBt CqImMwnUyz+b+HgDx7XUNM9L7g1vdag= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Kent Overstreet To: Tejun Heo Cc: Johannes Weiner , Michal Hocko , Suren Baghdasaryan , akpm@linux-foundation.org, vbabka@suse.cz, roman.gushchin@linux.dev, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, corbet@lwn.net, void@manifault.com, peterz@infradead.org, juri.lelli@redhat.com, ldufour@linux.ibm.com, catalin.marinas@arm.com, will@kernel.org, arnd@arndb.de, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org, peterx@redhat.com, david@redhat.com, axboe@kernel.dk, mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, dennis@kernel.org, muchun.song@linux.dev, rppt@kernel.org, paulmck@kernel.org, pasha.tatashin@soleen.com, yosryahmed@google.com, yuzhao@google.com, dhowells@redhat.com, hughd@google.com, andreyknvl@gmail.com, keescook@chromium.org, ndesaulniers@google.com, gregkh@linuxfoundation.org, ebiggers@google.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, jbaron@akamai.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, kernel-team@android.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, kasan-dev@googlegroups.com, cgroups@vger.kernel.org, Alexei Starovoitov , Andrii Nakryiko Subject: Re: [PATCH 00/40] Memory allocation profiling Message-ID: References: <20230501165450.15352-1-surenb@google.com> <20230503180726.GA196054@cmpxchg.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT 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, May 03, 2023 at 08:40:07AM -1000, Tejun Heo wrote: > > Yeah, easy / default visibility argument does make sense to me. > > So, a bit of addition here. If this is the thrust, the debugfs part seems > rather redundant, right? That's trivially obtainable with tracing / bpf and > in a more flexible and performant manner. Also, are we happy with recording > just single depth for persistent tracking? Not sure what you're envisioning? I'd consider the debugfs interface pretty integral; it's much more discoverable for users, and it's hardly any code out of the whole patchset. Single depth was discussed previously. It's what makes it cheap enough to be always-on (saving stack traces is expensive!), and I find the output much more usable than e.g. page owner.