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 D442FECAAD3 for ; Thu, 1 Sep 2022 23:50:38 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 59D7C80088; Thu, 1 Sep 2022 19:50:38 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 525A08000D; Thu, 1 Sep 2022 19:50:38 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3EDEF80088; Thu, 1 Sep 2022 19:50:38 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 297958000D for ; Thu, 1 Sep 2022 19:50:38 -0400 (EDT) Received: from smtpin03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id F19B512074E for ; Thu, 1 Sep 2022 23:50:37 +0000 (UTC) X-FDA: 79865163714.03.2A1ECC8 Received: from out0.migadu.com (out0.migadu.com [94.23.1.103]) by imf17.hostedemail.com (Postfix) with ESMTP id 822F640023 for ; Thu, 1 Sep 2022 23:50:37 +0000 (UTC) Date: Thu, 1 Sep 2022 16:50:10 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1662076236; 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=QeZ3ywOHO+ue61+bhlHhVrcPOQCnKvUeLhu9G4GOySc=; b=sadkhbMj3kQoxTU4Z0wL0RXHLY5y6xZiwOqubD8PoxvVg4LGYu+qUdek9jYhqs8dE5qisD cPrzl5F8o1AtoFcEb462CJ9ApSsv/yCMwGqAUCTFZ6Dxme6pBqRmTDZBKFxUtWhaf3KJSH DvKiilEWiSx7n4WVSBJXR8PEuxO/ReU= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Roman Gushchin To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, kent.overstreet@linux.dev, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, void@manifault.com, peterz@infradead.org, 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 16/30] mm: enable slab allocation tagging for kmalloc and friends Message-ID: References: <20220830214919.53220-1-surenb@google.com> <20220830214919.53220-17-surenb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220830214919.53220-17-surenb@google.com> 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=1662076237; 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=QeZ3ywOHO+ue61+bhlHhVrcPOQCnKvUeLhu9G4GOySc=; b=lsCtMZflCAHztvrVdoBLau9zo4UMlDPl/w9ZgEidytts+q1ONwMl1Qf+i5dAFpFdIfqlPy kvDA2GrLDCKiMiBpjrkZsborJj65yHXQpq5VAo9jGBsPgO3O15sGrS/H7EctZNv51Ta6P2 4zKQyzVGT8ppE9W2isbEsvudveg1IFo= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=sadkhbMj; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf17.hostedemail.com: domain of roman.gushchin@linux.dev designates 94.23.1.103 as permitted sender) smtp.mailfrom=roman.gushchin@linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1662076237; a=rsa-sha256; cv=none; b=YI/MoRF7ZoIa8z1BCHyql/Vk0fcI/HWKruD7Zas3rugAuK5t4e2es4TaA8yeH8RKgB2W0z EbB97fuLWBZ8j00595uvFbVARzRcFtF/CBjdR/1zeD458Q+8DUiYZ1M9lFZAWadOVvQDcL cO9V1jAzVajFeHI8mndLLfN0EeweQho= Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=sadkhbMj; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf17.hostedemail.com: domain of roman.gushchin@linux.dev designates 94.23.1.103 as permitted sender) smtp.mailfrom=roman.gushchin@linux.dev X-Rspamd-Queue-Id: 822F640023 X-Stat-Signature: yt4zy6r3zr6rytipftrende8qtg7e84n X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1662076237-807015 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 02:49:05PM -0700, Suren Baghdasaryan wrote: > Redefine kmalloc, krealloc, kzalloc, kcalloc, etc. to record allocations > and deallocations done by these functions. One particular case when this functionality might be very useful: in the past we've seen examples (at Fb) where it was hard to understand the difference between slab memory sizes of two different kernel versions due to slab caches merging. Once a slab cache is merged with another large cache, this data is pretty much lost. So I definetely see value in stats which are independent from kmem caches. The performance overhead is a concern here, so more data would be useful. Thanks!