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 D2AC7C61D85 for ; Tue, 21 Nov 2023 01:30:06 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EA1D56B03C8; Mon, 20 Nov 2023 20:30:05 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E514C6B03CD; Mon, 20 Nov 2023 20:30:05 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CF2B36B03CE; Mon, 20 Nov 2023 20:30:05 -0500 (EST) 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 C193C6B03C8 for ; Mon, 20 Nov 2023 20:30:05 -0500 (EST) Received: from smtpin03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 92F5C140345 for ; Tue, 21 Nov 2023 01:30:05 +0000 (UTC) X-FDA: 81480230370.03.E3A6022 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf11.hostedemail.com (Postfix) with ESMTP id DDF854000B for ; Tue, 21 Nov 2023 01:30:03 +0000 (UTC) Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="mC/i3X0/"; spf=pass (imf11.hostedemail.com: domain of broonie@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=broonie@kernel.org; dmarc=pass (policy=none) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1700530204; 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=SX6J+y940szISpfXj5ygkM2kgRmQeZaAHmhKI2ECqD4=; b=Y6wMAAp8nYLC9frzCUC4ULG0hGJiI4BSKMuiCIaqf8gZBQSl55xhFc82Bn1OLYdJ4gdey1 FwC0wKHDCjMm1HzeWQO8ui5ipejjewy2ySbei6WV6h40Oi3ffsV/cI9998ymPPAuUWhzcg sPpz0hoZhs2kKq0ifyaWKrSzHOV4MeA= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="mC/i3X0/"; spf=pass (imf11.hostedemail.com: domain of broonie@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=broonie@kernel.org; dmarc=pass (policy=none) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1700530204; a=rsa-sha256; cv=none; b=2rqCGZ/nu6Bn3jVp434w1JYqNxYWa+NJK4RXkDCWUdLhQ1Iw8Gpd+qe1UP7KgDWRKAG1Dt gNCnh0TckV3nAOZvyn1Yi2jN8p3GO6w71lfkDLsS8MuNgoE1hvcBb4b62Qtv98/yjC1WvK w+uOkYifPIj3BAOR3Q3fjQ3qGQVzAdk= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 8E1B0615FF; Tue, 21 Nov 2023 01:30:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 59A95C433C8; Tue, 21 Nov 2023 01:30:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700530202; bh=KB6C3AARW98gRsfl4vb5qYka+ApFHo2V74XpC+kmCbE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=mC/i3X0/F2o1u4iuo/Gjsn/e3Pl1hvwqaW/PLQLhqvoWZjWSd4rhoEMIPgLlnwj0X RIMfVoKxO7uMuZ6RQcZLtq0qeJW0twNYTBWwPpqZeaIBW8Rr/YNkIGeQ12LaxOC/gE NrCtRn3aGzV8/XZhXL4oMEF6MEG7cqZups9obN4s5G51y03rI0qEo0/3E3dIjW1l+7 5iMRaU3aU7xDFH6LjI/V8641PKbhFGN5eBYlt9QpbaMx7XOKbKZks+nOOFWBJe6dPM UvyOCyNl8JPX3I2lO6/K2Zofnk6PPcpV6lMvqh1YUdfl4muEwI+lWo6IdoHYtZATMs N45FbINojK0hQ== Date: Tue, 21 Nov 2023 01:29:56 +0000 From: Mark Brown To: Chengming Zhou Cc: vbabka@suse.cz, cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Chengming Zhou Subject: Re: [PATCH v5 6/9] slub: Delay freezing of partial slabs Message-ID: References: <20231102032330.1036151-1-chengming.zhou@linux.dev> <20231102032330.1036151-7-chengming.zhou@linux.dev> <4f3bc1bd-ea87-465d-b58a-0ed57b15187b@sirena.org.uk> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="YQqyVgGJY78HPdNK" Content-Disposition: inline In-Reply-To: X-Cookie: Slow day. Practice crawling. X-Rspamd-Queue-Id: DDF854000B X-Rspam-User: X-Stat-Signature: nkaqa47oasxdqgoqbhyngiaokcq713o9 X-Rspamd-Server: rspam01 X-HE-Tag: 1700530203-884370 X-HE-Meta: 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 SslcgJXg M1WkCHCJS/GYAfz/XxYZZ9DA1fNGdNw7NYHGR5chwBNJXPyj+DqPwHuHL8Rrc+HssSgPRvSSkji8MneSDF8IvWlG65CnVbBnQ3aoylpLq3DxEwdxOae/UvYt3fJVSQCZUKqeM3VEwGMRqRmUKoVcDlfdSo4aUOFpYDGtMiUIUMo3R4gqsdGV6dJZo/lXT4zMVgWF8sZD95Cev//zEMh7CRkLge5Nk6ljDHc3pQ4+O4QVvPUBvkjgRa4ZG5l9VL/Sr0yDMtB+C9FmtWmj+6YVC/G14BMMZ2xI6wJk3hf/7PuPnP4WmWy1EDYOs8W3dWV8X/APN0NaSa9kNVAwnSMiYNieW74ntyurMHGpdm6ALEHMowK34nQL574UVCp+LGku77o4P 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: List-Subscribe: List-Unsubscribe: --YQqyVgGJY78HPdNK Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Nov 21, 2023 at 08:58:40AM +0800, Chengming Zhou wrote: > On 2023/11/21 02:49, Mark Brown wrote: > > On Thu, Nov 02, 2023 at 03:23:27AM +0000, chengming.zhou@linux.dev wrot= e: > > When we see problems we see RCU stalls while logging in, for example: > > [ 46.453323] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: > > [ 46.459361] rcu: 3-...0: (1 GPs behind) idle=3Ddef4/1/0x40000000 so= ftirq=3D1304/1304 fqs=3D951 > > [ 46.467669] rcu: (detected by 0, t=3D2103 jiffies, g=3D1161, q=3D49= 9 ncpus=3D4) > > [ 46.474472] Sending NMI from CPU 0 to CPUs 3: > IIUC, here should print the backtrace of CPU 3, right? It looks like CPU = 3 is the cause, > but we couldn't see what it's doing from the log. AIUI yes, but it looks like we've just completely lost the CPU - there's more attempts to talk to it visible in the log: > > A full log for that run can be seen at: > >=20 > > https://validation.linaro.org/scheduler/job/4017095 but none of them appear to cause CPU 3 to respond. Note that 32 bit ARM is just using a regular IPI rather than something that's actually a NMI so this isn't hugely out of the ordinary, I'd guess it's stuck with interrupts masked. --YQqyVgGJY78HPdNK Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAmVcCBEACgkQJNaLcl1U h9BY3gf/Yva03binr9nZWNKW+uopqvbdwWrBq7OeqsCiZhC+0HySXIFBScCUneTJ aggO36Ya9Yl7jtV0K9xShKamayOfpWQWOreEP+K1BDQnxdr6/z0i0lW4qT62Ix9c agOVYX8IQxPaiSuoF7SELhMMvtuC1LkYoAFN9f9NtD3FpGCu2j6ZPv/h7njxUwHl 3omiMObUyuScdEs0O7Bg1SwEcRpVIBuS2ybIvy+rSp4ni8NHBkN/4f0fZZrACH5o gIQ5PAwFXR0XHhOxWSWnQjfEa4q5M7+y2KRofmtT44OD/7st3xxdbWU33tvnSycK NQZPR9zoGXInFDz1PsNwwABL1y7AbA== =OEUv -----END PGP SIGNATURE----- --YQqyVgGJY78HPdNK--