From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2B87B2C17A1; Thu, 12 Jun 2025 16:15:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749744908; cv=none; b=UTVuCct0YdKIpewI3OeyBab3jO47/iw2BvA0LQK63Cq3enHZppEFGacM0XPTuX91EeAavy9rodheESd4E/CtVJAdVk0uZkj93ajJIZcTvj0CDhUNlO7gbeI2SkKsfg2HK19mfksqC7CyLIHZjjPmeiepGLdupgcqcoAYq8jt760= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749744908; c=relaxed/simple; bh=jb6yzjh0u56Lwu10yKswbPCFIuXJ7v0u16sEAa3CQTY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=E6C1mcLWuCoNb517hcbtAp18M09Y9gyVbPsCKe3ucGjjgIQpNQpOj/O9EWrAejBydbOQMyLky1pR8HdNpo01k8kmmkThcIUt50rCax1qqbTg9JK2IhHO7PMglD6WuJzbUFIo09/rOFKAB/cUZYay5ZXGVW+W/2DVIWVQO+Famx8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZdiOi0vT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ZdiOi0vT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2E2E4C4CEEA; Thu, 12 Jun 2025 16:15:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1749744907; bh=jb6yzjh0u56Lwu10yKswbPCFIuXJ7v0u16sEAa3CQTY=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=ZdiOi0vTXYo1QnrxuOez2SH4Ahi2HlXa+BM7PFr5Y9duofzSpDDR5cNxpT2mZTMzj FpJwK0gUGTxammKnyPiR5pStd92oMCdzO7UHIZ2FTOCUA+fATULtteXIuapscQbSUF JrDwgECF/lHNlkAEr3kZfeeK6RrUXP44OZ33aWg+kCwal9zPhl5QRGfhAn/01psxfz dQUd36mx9e1Gw0Vm4P6VTJpT925yD+/lZCWDmOVPfGTgUc/DPEJYZY93CsoSn6alVw fZNAAeLZo9iGGtdZKu7mwSyBkD1+NzKzLvZz7DvcPm4RV/gKaB43g1kbFSoZOWEKqc mW/ZopK3TsDsQ== Message-ID: <1cd4d07f7afbd7322a1330a49a2cc24e8ff801cd.camel@kernel.org> Subject: Re: [PATCH 1/2] nfsd: use threads array as-is in netlink interface From: Jeff Layton To: Chuck Lever , Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Trond Myklebust , Anna Schumaker , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: Mike Snitzer , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, netdev@vger.kernel.org Date: Thu, 12 Jun 2025 12:15:05 -0400 In-Reply-To: References: <20250527-rpc-numa-v1-0-fa1d98e9a900@kernel.org> <20250527-rpc-numa-v1-1-fa1d98e9a900@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ 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CHqumUHRry+RF0lH00clzX/W8OrQJZtoBPXv9ahka/Vp7kEulcBJr1cH5Wz/WprhsIM7U9pse1f1g Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2025-06-12 at 12:05 -0400, Chuck Lever wrote: > On 6/12/25 11:57 AM, Jeff Layton wrote: > > On Tue, 2025-05-27 at 20:12 -0400, Jeff Layton wrote: > > > The old nfsdfs interface for starting a server with multiple pools > > > handles the special case of a single entry array passed down from > > > userland by distributing the threads over every NUMA node. > > >=20 > > > The netlink control interface however constructs an array of length > > > nfsd_nrpools() and fills any unprovided slots with 0's. This behavior > > > defeats the special casing that the old interface relies on. > > >=20 > > > Change nfsd_nl_threads_set_doit() to pass down the array from userlan= d > > > as-is. > > >=20 > > > Fixes: 7f5c330b2620 ("nfsd: allow passing in array of thread counts v= ia netlink") > > > Reported-by: Mike Snitzer > > > Closes: https://lore.kernel.org/linux-nfs/aDC-ftnzhJAlwqwh@kernel.org= / > > > Signed-off-by: Jeff Layton > > > --- > > > fs/nfsd/nfsctl.c | 5 ++--- > > > 1 file changed, 2 insertions(+), 3 deletions(-) > > >=20 > > > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c > > > index ac265d6fde35df4e02b955050f5b0ef22e6e519c..22101e08c3e80350668e9= 4c395058bc228b08e64 100644 > > > --- a/fs/nfsd/nfsctl.c > > > +++ b/fs/nfsd/nfsctl.c > > > @@ -1611,7 +1611,7 @@ int nfsd_nl_rpc_status_get_dumpit(struct sk_buf= f *skb, > > > */ > > > int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *= info) > > > { > > > - int *nthreads, count =3D 0, nrpools, i, ret =3D -EOPNOTSUPP, rem; > > > + int *nthreads, nrpools =3D 0, i, ret =3D -EOPNOTSUPP, rem; > > > struct net *net =3D genl_info_net(info); > > > struct nfsd_net *nn =3D net_generic(net, nfsd_net_id); > > > const struct nlattr *attr; > > > @@ -1623,12 +1623,11 @@ int nfsd_nl_threads_set_doit(struct sk_buff *= skb, struct genl_info *info) > > > /* count number of SERVER_THREADS values */ > > > nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) { > > > if (nla_type(attr) =3D=3D NFSD_A_SERVER_THREADS) > > > - count++; > > > + nrpools++; > > > } > > > =20 > > > mutex_lock(&nfsd_mutex); > > > =20 > > > - nrpools =3D max(count, nfsd_nrpools(net)); > > > nthreads =3D kcalloc(nrpools, sizeof(int), GFP_KERNEL); > > > if (!nthreads) { > > > ret =3D -ENOMEM; > >=20 > > I noticed that this didn't go in to the recent merge window. > >=20 > > This patch fixes a rather nasty regression when you try to start the > > server on a NUMA-capable box. >=20 > The NFSD netlink interface is not broadly used yet, is it? >=20 It is. RHEL10 shipped with it, for instance and it's been in Fedora for a while. > Since this one came in late during the 6.16 dev cycle and the Fixes: tag > references a commit that is already in released kernels, I put in the > "next merge window" pile. On it's own it doesn't look urgent to me. >=20 I'd really like to see this go in soon and to stable. If you want me to respin the changelog, I can. It's not a crash, but it manifests as lost RPCs that just hang. It took me quite a while to figure out what was going on, and I'd prefer that we not put users through that. >=20 > > It all looks like it works, but some RPCs > > get silently dropped on the floor (if they happen to be received into a > > node with no threads). It took me a while to track down the problem > > after Mike reported it. > >=20 > > Can we go ahead and pull this in and send it to stable? > >=20 > > Also, did this patch fix the problem for you, Mike? >=20 > I'll wait for confirmation. --=20 Jeff Layton