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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D6398FAD3EE for ; Thu, 23 Apr 2026 02:14:50 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 15D266B008C; Wed, 22 Apr 2026 22:14:50 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 10E8F6B0092; Wed, 22 Apr 2026 22:14:50 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0236A6B0093; Wed, 22 Apr 2026 22:14:49 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id E76576B008C for ; Wed, 22 Apr 2026 22:14:49 -0400 (EDT) Received: from smtpin15.hostedemail.com (lb01b-stub [10.200.18.250]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 795F11201BF for ; Thu, 23 Apr 2026 02:14:49 +0000 (UTC) X-FDA: 84688202298.15.25D2C94 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf06.hostedemail.com (Postfix) with ESMTP id D658E180005 for ; Thu, 23 Apr 2026 02:14:47 +0000 (UTC) Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=TtohxZ96; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf06.hostedemail.com: domain of harry@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=harry@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1776910488; a=rsa-sha256; cv=none; b=x+fhlx21OPXGiZ7FYo8Foo3QVbTlgzr420svWN/9JO9JotY90T3O5gOeRAreZmemPgxXYs KykI4mUhDdd99Sz4fzHJd+8DPwy2sz26DG1/pD60DpCnaRwiQcB2Xwml72ZCSGr28cTiaa bDDpIWzySfZttlgqjUmSzOpj4/H9Zu8= ARC-Authentication-Results: i=1; imf06.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=TtohxZ96; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf06.hostedemail.com: domain of harry@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=harry@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1776910488; 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=1nvmWBE7p3mNyGjM84Mtg6hKNaeJqvODoUnH9Qe9p70=; b=71oeTRKVd3B/qRjh3BndqSj0WluoR+juEZJieopbYs2chx8iiLqKltfueJmc41mzL+gVVG b9OFm3SOhIdbwE160SfIC8pp9y3RoVsBiHtXL42e40NfHTb4v+sTC6edy9AyEiGgMme72T Q4cw0la9PsLe/Jbe3ytyaP4LIuuKaVg= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 73D3040A66; Thu, 23 Apr 2026 02:14:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E883EC2BCB4; Thu, 23 Apr 2026 02:14:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776910486; bh=w+jgw7+Kepc9dYFzbTYrY6IcLLSgaQuTLOr35M233RA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=TtohxZ96b5cBJNzVWuN1KlMFfV8bzUz4S2Z3cc4VHRO92xjBes5Xd9TvclMKCyXqs dACx334Bw1ZWDNoum4nQ6hCYEZtweXJOY6D/PPo6OO7s1eWDqYT+Gs8Pgc6bCijmX4 FHe7gBmrsiEcSoIkSkznshwyNLJ5F7WTwwBaW/5enxNvLFg+AHMNfagUcbbxdmIxlO pAx5fAe3kRB1TJY6fLr9ZJwhkV+4DgZt6lJZkDNYNF1al6OtPMkB9sOxoW+t9jQ66g xWhe90YqtmqZegKSnVh5ynbUEkgz6fiQvq/OZx3eiZDbOyrJdXbHbT7bE3zhhcN1In 6O397lYNVvYZA== Date: Thu, 23 Apr 2026 11:14:44 +0900 From: "Harry Yoo (Oracle)" To: Uladzislau Rezki Cc: Andrew Morton , Vlastimil Babka , Christoph Lameter , David Rientjes , Roman Gushchin , Hao Li , Alexei Starovoitov , "Paul E . McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Zqiang , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , rcu@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 4/8] mm/slab: introduce kfree_rcu_nolock() Message-ID: References: <20260416091022.36823-1-harry@kernel.org> <20260416091022.36823-5-harry@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam10 X-Stat-Signature: ckt36u3nqaktnyk3joh9r799m8cz8aoa X-Rspam-User: X-Rspamd-Queue-Id: D658E180005 X-HE-Tag: 1776910487-363385 X-HE-Meta: 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 CaT402yl 7qb1iOTmp8Fg1VIRzB1kzQAVhdirJajywR5orL4H+0Kd1jvWgE+ce6mSZXkXxo2bfI4F9HZFJOciG+ECqfqJMJESfqer4U75dFaxoAMk9QxPVA4pW6HpvzoED4TWJq4KFZmBamvJjbJlVc+coMubk//nDqOCtVAun4J/VkLaZpPfrJekNrCxvAry0pz/hRsQC75B192CFuH2MRoyMDIk9WnpOMGhP/HwXefrREN2fGv3Wb8QeESnI5cCxUBQPfa23JlnpjM+5Lb644p4RKkZe3GoHIV7uk6O3co+jxmnuw0pHn7vsVHFqkri8VORqxCLNYgr5 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Apr 23, 2026 at 10:08:49AM +0900, Harry Yoo (Oracle) wrote: > On Wed, Apr 22, 2026 at 04:42:28PM +0200, Uladzislau Rezki wrote: > > On Thu, Apr 16, 2026 at 06:10:18PM +0900, Harry Yoo (Oracle) wrote: > > I think a better option is to add a separate kvfree_rcu_nmi() helper, > > or similar, and avoid complicating the generic implementation. Otherwise, > > the common path risks becoming harder to maintain. > > It's unfortunate that I didn't provide performance data to justify > adding complexity. I can try, but apparently you're not talking > about that. > > Rather, you seem to be arguing that you're against this pattern > no matter what the benefits are? > > I'm confused. I was indeed confused, but before writing this, I should have thought that you might be considering a simple but still efficient solution. Apologies, my reply may have sounded a bit offensive. -- Cheers, Harry / Hyeonggon