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 BAC5EC54FCD for ; Thu, 30 Jul 2026 03:08:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6781D6B008C; Wed, 29 Jul 2026 23:08:54 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 628D76B0092; Wed, 29 Jul 2026 23:08:54 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4F3676B0093; Wed, 29 Jul 2026 23:08:54 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 220416B008C for ; Wed, 29 Jul 2026 23:08:54 -0400 (EDT) Received: from smtpin11.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay05.hostedemail.com (Postfix) with ESMTP id AC62D40569 for ; Thu, 30 Jul 2026 03:08:53 +0000 (UTC) X-FDA: 85043960946.11.52AD178 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf22.hostedemail.com (Postfix) with ESMTP id 0EB10C0003 for ; Thu, 30 Jul 2026 03:08:51 +0000 (UTC) Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=Fkb51iDq; spf=pass (imf22.hostedemail.com: domain of harry@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=harry@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1785380932; b=q1Qm9RKjT3AY2cp/gLq2TfWkhGqIIViUb222EuKn+PIPMR5ZtduPCyRHbpR/NyGC546sEg RkNVsqqHSriHroMfRm/jpDGMU9/2LTBPTqe7a0r/FEyO/QpYPF6pAoDC2exDMBMcAKZnmW Z/cVQN5L1j5bTSEQdvtB/1bx/i+5Ooc= ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=Fkb51iDq; spf=pass (imf22.hostedemail.com: domain of harry@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=harry@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1785380932; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=JFYplbxEhQ00hEvZ5hng6YDKKuCP2Lh5XB9nlXgKZ7o=; b=4npw/km8G5CcJzvioTqO/ARzjDwkXsC94oHV8qM4qL+P6yQgxnYwGYhYsr1zEyx/XsyP3Y ANgFJ9/gSJPjm9gOq9YfCF0khcmAFEX6sp/H26em49AokrCxozTHelavGSmo3GMF+I8Oxl o24u7eDmhFh3sKcK/Lzao5QxuJsp55g= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 857D8600AA; Thu, 30 Jul 2026 03:08:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 30B9F1F000E9; Thu, 30 Jul 2026 03:08:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785380931; bh=JFYplbxEhQ00hEvZ5hng6YDKKuCP2Lh5XB9nlXgKZ7o=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Fkb51iDqkqLHhVoJ5kwF3219gubEw0+gbN9PTrmEy6rMkapWH7oDh37pFO+af77/p kahJV9sx2eIC5HeZEEK5a4hik06jV5Zj94qDu1RFbxTuppTEsUCTMQco42MDHgMdnn 4B5D1ck16rJRGRY8IfDwuJwucgu6QHd0hpvL1J3gEXQ1MmVC7ufOXWqkqyu1ph7nZ8 tjhCBvGb8Ow0Zy8k5pqlD5tmdBpqIjJZX4uOT8jHL61KSaS3rYAcz1sDDv1N14ff0T 85D3zm7H5b/fEVJBzh3I8jE7+3KKEuFiUGgOScu24FS2KR4fTV0BwKMeqOlHT0qAM7 tD7nZxZ/SveFA== Message-ID: Date: Thu, 30 Jul 2026 12:08:44 +0900 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 0/8] mm/slab: introduce kfree_rcu_nolock() and improve slub_kunit coverage To: "Vlastimil Babka (SUSE)" , Andrew Morton , Hao Li , Christoph Lameter , David Rientjes , Roman Gushchin , Alexei Starovoitov , Andrii Nakryiko , Puranjay Mohan , Amery Hung , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , "Paul E. McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Pedro Falcato , Suren Baghdasaryan , Shengming Hu Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, rcu@vger.kernel.org, bpf@vger.kernel.org References: <20260729-kfree_rcu_nolock-v5-0-a28cdcda9673@kernel.org> <5342124c-4847-4e93-92a4-f3512928c4d1@kernel.org> Content-Language: en-US From: Harry Yoo In-Reply-To: <5342124c-4847-4e93-92a4-f3512928c4d1@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 0EB10C0003 X-Stat-Signature: jg7hren8uy73kcwqz431t74hoqr3s5nf X-Rspam-User: X-HE-Tag: 1785380931-372835 X-HE-Meta: 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 mdbijGOO ciIm8XERD3Yxb0EA8v2uB82ok+9dJyL3RBU+tTWZdh6FXhqN1+A+UfnWfdeACO489lBsrEavd5921/Zx7PMon7dajzafPmVSGeuG5TtYj0ILVQd9IYuEtKQgTl6lei2s/CvPdG76l9mvfsN2mXL61WyYAQAHH4/NGtwRNZ1LTyYI0tlNlwojbVeuAAQXs0NPGX60s2Wpq+XkJhcW6BZ1WaxftRuFFKHqRCwdj+YvIYrECHNkn8vP1PwVejUOF5a2jY9QkeYOaaS8fpudQ1zxjDDn2WX823E8AreDJ14+JkYoS8N+4ce7oDiecAM9Nkw1N/jnP0e0wogQn2qhgk9m0npXnFjjDr4Qe7O/dtMA5WLsn6IY= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/29/26 11:14 PM, Vlastimil Babka (SUSE) wrote: > On 7/29/26 10:20, Harry Yoo (Oracle) wrote: > > ... > >> 8: 8e69c83a1e52 ! 8: aeaf2ab60046 slub_kunit: extend the test for kfree_rcu_nolock() >> @@ lib/tests/slub_kunit.c: struct test_nolock_context { >> - gfp_t gfp = (i % 2) ? GFP_KERNEL : GFP_KERNEL_ACCOUNT; >> + gfp_t gfp = (i & 1) ? GFP_KERNEL : GFP_KERNEL_ACCOUNT; >> >> - objects[j] = kmalloc_obj(*objects[j], gfp); >> +- objects[j] = kmalloc(64, gfp); >> ++ objects[j] = kmalloc_obj(*objects[j], gfp); >> if (!objects[j]) { >> + j--; >> + while (j >= 0) >> @@ lib/tests/slub_kunit.c: static void test_kmalloc_kfree(void) >> } >> } >> >> Link: https://lore.kernel.org/linux-mm/20260427-nolock-api-fix-v2-0-a6b83a92d9a4@kernel.org [1] >> Link: https://lore.kernel.org/linux-mm/6edebc2b-5f5a-4b9c-9a4c-564310acee1b@kernel.org [2] >> Acked-by: Vlastimil Babka (SUSE) >> Signed-off-by: Harry Yoo (Oracle) >> Link: https://lore.kernel.org/linux-mm/872bd673-3d45-4111-8a41-31185db3ece5@kernel.org >> Signed-off-by: Harry Yoo (Oracle) >> Link: https://lore.kernel.org/linux-mm/6811cc17-8ee4-48c8-8cbf-6bf4d9f98162@kernel.org [1] >> Link: https://lore.kernel.org/linux-mm/40591888-3a87-433e-b3d2-cda1cab543be@kernel.org [2] >> Suggested-by: Vlastimil Babka (SUSE) >> Signed-off-by: Harry Yoo (Oracle) >> Signed-off-by: Harry Yoo (Oracle) >> Signed-off-by: Harry Yoo (Oracle) > > Wonder what produced this weird block of assorted trailers? "b4 prep > --compare-to vX" never did that for me? Interesting. I checked it again with `b4 prep --compare-to v4`, but the command didn't produce this. Looking at the cover letter `b4 prep --edit-cover` It's not even there. Probably it was produced during b4 send --no-sign? hmm... >> --- >> Harry Yoo (Oracle) (8): >> mm/slab, slub_kunit: register kprobe to trigger _nolock APIs >> mm/slab: handle the !allow_spin case in kfree_rcu_sheaf() >> mm/slab: use call_rcu() in unknown context if irqs are enabled >> mm/slab: extend deferred free mechanism to handle rcu sheaves >> mm/slab: allow kfree_rcu_sheaf() on PREEMPT_RT >> mm/slab: introduce struct kvfree_rcu_head for kvfree_rcu batching >> mm/slab: introduce kfree_rcu_nolock() >> slub_kunit: extend the test for kfree_rcu_nolock() >> >> include/linux/rcupdate.h | 32 ++++++- >> include/linux/slab.h | 16 +--- >> include/linux/types.h | 8 ++ >> include/trace/events/rcu.h | 2 +- >> lib/tests/slub_kunit.c | 190 ++++++++++++++++++++++++++++----------- >> mm/slab.h | 52 ++++++++++- >> mm/slab_common.c | 81 +++++++++++++---- >> mm/slub.c | 220 ++++++++++++++++++++++++++++----------------- >> 8 files changed, 433 insertions(+), 168 deletions(-) > > Applied to slab/for-7.3/kfree_rcu_nolock and merged go slab/for-next, thanks! Thanks a lot! > Used slab/for-next-fixes as a base for a better topic branch indepdencence. Ah, I see. thanks. So slab/for-next is not a good base unless it depends too much on existing commits on the branch? And usually it's better to use the base (slab/for-next-fixes, in this case) of slab/for-next as a base? >> --- >> base-commit: ffc64805cebac330b2a60b2f1f144fcc35b8ab46 >> change-id: 20260615-kfree_rcu_nolock-e5502555992f >> >> Best regards, -- Cheers, Harry / Hyeonggon